NEET Chemistry MCQS - Important Questions and answers



Alcoholsphenols Ethers MCQ Questions

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Alcoholsphenols Ethers Questions and Answers

Alcoholsphenols Ethers Quiz Question Answer

Williamson's synthesis reaction, among the following is -

C2H5I + C2H5ONaC2H5.O.C2H5 + NaI

The compound that will not form a yellow precipitate on heating with an alkaline solution of iodine is: 

CH3OH                                               

The incorrect reaction among the following is-

 

n-Propyl alcohol and iso-propyl alcohol can be distinguished by - 

oxidation with potassium dichromate

The products of combustion of an aliphatic thiol (RSH) at 298K are:-

 CO2(g), H2O(g)andSO2(g)

Among the following sets of reactants which one produces anisole?                           

C6H5OH, NaOH, CH3I

Which one is formed when sodium phenoxide is heated with ethyl iodide?              

Phenetole

Which reagent will convert propionic acid to propanol-1?

LiAlH4

Butan-2-ol is a-

Secondary alcohol

Primary alcohols can be obtained from the reaction of the RMgX with:

HCHO                       

Aldehydes Ketones Carboxylic Acids MCQ Questions

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Aldehydes Ketones Carboxylic Acids Questions and Answers

Aldehydes Ketones Carboxylic Acids Quiz Question Answer

Ketones are first oxidation product of:

secondary alcohols

Alkaline hydrolysis of R2C.Cl2 forms:

alkanone

Ketones are prepared by:

Oppeanauer's oxidation

Chlorine does not react with:

methanal 

Both acetaldehyde and ketone react with:

 

2,4-dinitro phenylhydrazine

Aldehydes are produces in atmosphere by:

reaction of oxygen atoms with hydrocarbons

Among acetic acid, phenol and n-hexanol which one of the following compound will react with NaHCO3 solution to give sodium salt and CO2?                                             

Acetic acid

The reagent used for the separation of acetaldehyde from acetophenone is-

  NaHSO3         

Iodoform test is not given by

3-pentanone

Which of the following compounds with molecular formula, C5H10 yields acetone on ozonolysis? 

2-methyl-2-butene

Amines MCQ Questions

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Amines Questions and Answers

Amines Quiz Question Answer

The compound formed when malonic ester reacts with urea is:

barbituric acid

The type of isomerism shown by C6H5CN and C6H5NC is:

Functional

Compound that will undergo Hoffmann reaction is-

 RCONH2

The reagent needed to convert acetamide into methyl amine is -

NaOH/ Br2


The above reaction is an example of....

Intramolecular N-N coupling

The hydrochlorides of amines form double salt with: 

both (a) and (b)

Which of the following can not be formed by Gabriel phthalimide synthesis:-

 

 

An amine gives a solid compound that is insoluble in alkali with benzene sulphonyl chloride.

The amine is -

 CH3-NH-CH2-CH3

The compound A and B respectively are

2

Basic Concepts Chemistry MCQ Questions

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Basic Concepts Chemistry Questions and Answers

Basic Concepts Chemistry Quiz Question Answer

A significant figure is defined as -

The total number of digits in a number, including the last digit that represents the uncertainty of the result. 

How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCl?

0.029

The concentrated nitric acid is 70% HNO3. The amount of concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO3 would be

45.0 g conc. HNO3

What is the mole fraction of the solute in a 1.00 molal aqueous solution?

0.0177

6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of the solution is

0.01M

Which of The following has a maximum number of molecules?

2g H

The number of moles of KMnO4 reduced by one mole of KI in an alkaline medium is- 

Two

The number of moles of oxygen in 1L of air containing 21% oxygen by volume, under standard conditions, is 

0.0093 mole

What volume of  oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of  propane gas (C3H8) measured under the same conditions?

5L

1 g of magnesium is burnt with 0.56g of oxygen in a closed vessel.The surplus reactant and its quantity are

(At. weight of Mg = 24, O=16)

Mg, 0.16g

Biomolecules MCQ Questions

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Biomolecules Questions and Answers

Biomolecules Quiz Question Answer

The two forms of glucopyranose obtained from solution of D-glucose are called

Anomers

Sucrose on treatment with conc. HCl produces:-

Glucose + Fructose

During the process of digestion, the proteins present in food materials are hydrolyzed to amino acids. The two enzymes involved in the process 

Proteins Enzyme (A) Polypeptides  Enzyme  (B) Amino acids are respectively

pepsin and trypsin

Phospholipids are esters of glycerol with

two carboxylic acid residues and one phosphate groups

Compound that gives positive Fehling's solution test is : 

Glucose

Which of the following is the sweetest sugar?

Fructose

a-D-(+)-glucose and b-D-(+)-glucose are

Anomers

The couplings between base units of DNA is through : 

Hydrogen bonding

The segment of DNA which acts as the instrumental manual for the synthesis of the protein is 

gene

Which of the following structures represents the peptide chain ?

 

Chemical Bonding Molecular Structure MCQ Questions

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Chemical Bonding Molecular Structure Questions and Answers

Chemical Bonding Molecular Structure Quiz Question Answer

The strongest hydrogen bond present among the following is-

 FHF

Which of the following is the most basic oxide?

 Bi2O3

In which of the process, the bond order increases and magnetic behaviour changes?

() NONO+

Among the following, which has the maximum hydration energy?

H+

Among the following oxides, which has the maximum lattice energy?

MgO

Which of the following pairs of species have similar shapes?

 PCl3, NH3

Incorrect statement about resonance is :

Hybrid structure is most energetic.

Which of the following species deviates from the octet rule?

 H2SO3

Which of the following species has a bent T-shape?

BrF3

In piperidine "N" atom has hybridization:

piperidine

 sp3

Chemical Kinetics MCQ Questions

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Chemical Kinetics Questions and Answers

Chemical Kinetics Quiz Question Answer

Hydrogenation of vegetable ghee at 250C reduces pressure of H2 from 2 atom to 1.2 atom in 50 minute. The rate of reaction in terms of molarity per second is:

 

1.09 x 10-5

A hypothetical reaction, A2 +B2  2AB mechanism as given below;

A2 A+ A          ............(Fast)

A+B2 → AB + B   ............(Slow)

A+ → AB         ............(Fast)

The order of the overall reaction is:

 

1.5

Following mechanism has been proposed for a reaction,

2A+B D+E

A+B C+D    ...(Slow)

A+ C E         ...(Fast)

The rate law expression for the reaction is:

r=K[A][B]

In gaseous reactions important for the understanding of the upper atmosphere H2O and O react bimolecularly to form two OH radicals. H for this reaction is 72kJ at 500 K and Ea is 77 kJ mol-1, then Ea for the bimolecular recombination of two OH radicals to form H2O and O is:

5 kJ mol-1

For a reaction A           Product, rate law is -d[A]dt=K[A]0. The concentration of A left after time t when t=1K is:

 [A]0e

For an exothermic chemical process occurring in two steps as;

(i) A+BX(Slow)

(ii) XAB (Fast)

The progress of the reaction can be best described by:

 

For the non-stoichiometric reaction 2A + B  C +D, the following kinetic data were obtained in three separate experiments, all at 298 K.

 Initial 

Concentration (A)

 Initial Concentration (B) Initial rate of formation of C (mol L-1 S-1)
         0.1 M        0.1 M 1.2×10-3
         0.1 M        0.2 M1.2×10-3
         0.2 M        0.1 M 2.4×10-3

 

The rate law for the formation of C is:

d[C]/dt = k[ A]

For the reaction N2 + 3H2  2NH3, the rate d[NH3]dt= 2 x 10-4 M s-1 .Therefore, the rate -d[N2]dt is given as:

10-4 Ms-1

If 'I' is the intensity of absorbed light and 'c' is the concentration of AB for the photochemical process AB + hv→  AB *, the rate of formation of AB * is directly proportional to:

I

Which curve represents zero order reaction?

 

Chemistry Everyday Life MCQ Questions

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Chemistry Everyday Life Questions and Answers

Chemistry Everyday Life Quiz Question Answer

Artificial sweetener that is stable under cold conditions only is : 

Aspartame                     

The incorrect statement among the following is : 

Dilute solutions of boric acid and hydrogen peroxide, are strong antiseptics.

Which one of the following is employed as antihistamine?

Diphenyl hydramine

Which one of the following is employed as a tranquilizer drug?

Valium

Which of the following protein destroy the antigen when it enters in body cell?

 

Antibodies

Vitamin- B12 contains

Co (II)

Enzymes take part in a reaction and

increase the rate of a chemical reaction

Which one of the following vitamins is water-soluble?

Vitamin-B

Which one of the following is employed as a tranquiliser?

Equanil

Commonly used antiseptic 'Dettol' is a mixture of

chloroxylenol + terpineol

Classification Elements Periodicity Properties MCQ Questions

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Classification Elements Periodicity Properties Questions and Answers

Classification Elements Periodicity Properties Quiz Question Answer

Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

 

(n-1)d and ns orbits

According to Moseley, a straight-line graph is obtained on plotting-

The square root of the frequencies of characteristic X-rays of elements against their atomic numbers

The tenth element in the periodic table resides in:

the second period

Which of the following order is not in accordance with the property stated against it?                                                                                                      

F2 > Cl> Br2 > l2 Bond dissociation energy

An element X occurs in short period having configuration ns2np1 . The formula and nature of its oxide are:

X2O3, amphoteric

The outermost electronic configuration of the most electronegative element is :

ns2np5

The elements X, Y, Z and J have the indicated electron configurations starting with the innermost shell. The most metallic element is :

 Z = 2, 8, 8, 1

Which statement is true?

The electronegative nature of elements increases along the period

The most non-metallic element among the following is:

B

58Ce is a member of which block?

 f-block elements.

Coordination Compounds MCQ Questions

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Coordination Compounds Questions and Answers

Coordination Compounds Quiz Question Answer

From the stability constant (hypothetical  values)given below, predict which is the strongest ligand?

Cu2++4CN[Cu(CN)4]2-;(K=2.0x1027)

Which does not obey EAN rule?

[Cu(NH3)4]2+

Which of the following species can act as reducing agent ?

 Mn(CO)6       

The coordination number and oxidation state of Cr in K3[Cr(C2O4)3] are respectively

6 and +3

The octahedral complex will not show geometrical isomerism is :
(A and B are monodentate ligands)

[MA5B]

According to IUPAC nomenclature sodium nitroprusside is named as

sodium pentacyanonitrosyl ferrate(II)

The compound that is not  π-bonded organometallic compound is :

(CH3)4Sn

IUPAC name of [Pt(NH3)3 (Br)(NO2)Cl]Cl is :

Triamminebromidochloridonitroplatinum(IV)Chloride

Which of the following cation does not form an amine complex with excess of ammonia?

Na+

The denticity of EDTA is : 

Hexadentate.

D F Block Elements MCQ Questions

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D F Block Elements Questions and Answers

D F Block Elements Quiz Question Answer

 The colourless species among the following are :

TiF62- and Cu2Cl

identify the incorrect statement among the following:

As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements

The lanthanide contraction is responsible for the fact that :

Zr and Hf have about the same atomic radius .

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is:

Lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

The electronic configuration of the last element of actinoids is-

Lawrencium, Lr: Rn5f146d17s2

Incorrect statement regarding the stability of oxidation state for the elements of 3d series is -

 The relative stability of the +2 oxidation state decreases on moving from top to bottom.

In which of the following pairs are both the ions coloured in aqueous solution?

(At. no : Sc =21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

Ni2+, Ti3+             

The correct order of atomic/ionic radii is:

 Sc>Ti>V>Cr                                

Which is not true in case of transition metals

They crystallise with body centered cubic and hexagonal close packed structure only

Which one of the following statements related to lanthanons is incorrect?

All the lanthanons are much more reactive than aluminium

Electrochemistry MCQ Questions

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Electrochemistry Questions and Answers

Electrochemistry Quiz Question Answer

The standard reduction potentials of Cu2+/Cu and Cu2+/Cu+ are 0.337 and 0.153V respectively. The standard electrode potential of Cu+/Cu half cell is:

0.521V

When a lead storage battery is discharged, then:

Sulphuric acid is consumed.

Metals have conductivity of the order of (ohm-1 m-1):-

108

An electrochemical cell is shown below Pt, H2(1 atm)| HCI (0.1 M)CH3COOH (0.1 M)|

H2(1 atm), Pt The EMF of the cell will not be zero, because

1. EMF depends on molarities of acids used

2

Saturated solution of KNO3 is used to make 'salt-bridge' because:

Velocities of both K+ and NO3- are nearly the same

A current is passed through two voltameters connected in series. The first voltmeter connected in series. The first voltmeter contains XSO4(aq) while the second voltmeter contains Y2SO4(aq). The relative  atomic masses of X and Y are in the ratio of 2:1. The ration of the mass of X liberated to the mass of Y liberated is: 

1:1

The mass of silver(eq. mass = 108) displaced by that quantity of current which displaced 5600 mL of hydrogen at STP is:

54 g

A silver cup is plated with silver by passing 965 coulomb of electricity. The amount of Ag deposited is:

 

1.08 g

Which is the correct representation for Nernst equation ?

All of the above

When a copper wire is immersed in a solution of AgNO3, the colour of solution becomes blue because copper:

Is oxidised to Cu2+

Environmental Chemistry MCQ Questions

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Environmental Chemistry Questions and Answers

Environmental Chemistry Quiz Question Answer

Green chemistry means such reactions that-

 

Reduce the use and production of hazardous chemicals.

The wrong statement about photochemical smog is-

It has a low concentration of oxidizing agents

A gas that is not common component of photochemical smog is-

Chlorofluorocarbons

Which one of the following statements regarding photochemical smog is not correct?

Photochemical smog does not cause irritation in eyes and throat

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

1. N2O52. NO23. N2O4. NO

1
Which one of the following statements is not true?

Concentration of dissolved oxygen below 5 ppm is good for the growth of fish

Among the following, the one that is not a greenhouse gas is:

  Sulphur dioxide

The phenomenon in which atmospheric gases trap the heat radiations from the sun near the earth’s surface and keeps it warm is known as-

Natural greenhouse effect

The gas that damages the ozone layer is -

CFCs 

Biosphere is

In which individual interact to each other

Equilibrium MCQ Questions

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Equilibrium Questions and Answers

Equilibrium Quiz Question Answer

Which is hydrazoic acid's conjugate base?

Azide ion

Among the following , the compound with highest pH is : 

Na2CO3 

The phenomenon of interaction of anions and cations furnished by an electrolyte with the H+ and  OH- ions of water to produce acidic nature or alkalinity is known as hydrolysis. In hydrolysis:

all of the above

The degree of dissociation of PCl5 (α) obeying the equilibrium,

PCl5 (g PCl3 (g) + Cl2 (g), is approximately related to the pressure at equilibrium by:

  α1/P

In a system: A(s)      2B(g) + 3C(g). If the concentration of C at eqilibrium is increased by a factor 2, it will cause the eqilibrium concentration of B to change to:

 122 times of its original value

 A weak acid, HA has a Ka of 1.00 x 10-5. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equibrium is closest to

1.00%                      

If little heat is added to ice  liquid equilibrium in a sealed container, then:

No change in P and T

In the equilibrium,

2SO2(g) + O2 (g) 2SO3(g), the partial pressure of SO2, O2 and SO3 are 0.662, 0.101 and 0.331 atm respectively. What should be the partial pressure of oxygen so that the equilibrium concentration of SO2 and SO3 are equal.

0.4 atm                   

Ionisation constant of CH3COOH is 1.7 X 10-5 and concentration of H+ ions is 3.4 X 10-4.Then, find out initial concentration of CH3COOH molecules.            

 

6.8 X 10-3

The formation of phosgene is represented as,

            CO + Cl2 COCl2

The reaction is carried out in 500 mL flask. At equilibrium o.3 mole of phosgene, 0.1 mole of CO and 0.1 mole of Cl2 are present. The equilibrium constant of the reaction is:

15

General Principles Processes Isolation Elements MCQ Questions

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General Principles Processes Isolation Elements Questions and Answers

General Principles Processes Isolation Elements Quiz Question Answer

Chalcogens are: 

ore forming elements 

Which process is not used in purification of bauxite?

Frankland's method

Chloride ore among the following is:

Karnalite

Corundum is:

 

Al2O3

Heating of carbonate ores to remove carbon is called as:

Calcination

Sulphide ores are common for the metals:

Ag, Cu and Pb

Which element occurs freely in nature?

Sulphur

Silver obtained by argentiferrous lead is purified by:

cupellation

High purity copper metal is obtained by:

Electrolytic reduction

Aluminothermic process is used for the extraction of metals, whose oxides are:

not easily reduced  by carbon

Haloalkanes Haloarenes MCQ Questions

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Haloalkanes Haloarenes Questions and Answers

Haloalkanes Haloarenes Quiz Question Answer

When CH3CH2CHCl2 is treated with NaNH2, the product formed is                             

CH3-CCH

Chlorobenzene reacts with Mg in dry ether to give a compound (A),
'A' further reacts with ethanol to yield -                                                                                                    

Benzene

R-CH2-CCl2-R ReagentR-CC-R. The reagent is

KOH in C2H5OH

Ethyl chloride is converted into diethyl ether by -                                                  

  Williamson's synthesis

The alkyl halide is converted into an alcohol by                                    

Substitution

The addition of Br2 on cis-but-2-ene gives:

Racemic mixture of 2,3-Dibromobutane

The number of different substitution products possible when ethane is allowed to react with bromine in sunlight are:

9           

 , Cl obtained by chlorination of n-butane, will be                

racemic mixture

The reactivity order of halides for dehydrohalogenation is 

R-I>R-Br>R-Cl>R-F

In SN2 reactions, the correct order of reactivity for the following compounds : CH3ClCH3CH2ClCH32CHCl and CH33CCl is :

 CH3Cl>CH3CH2Cl>CH32CHCl>CH33CCl

Hydrocarbons MCQ Questions

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Hydrocarbons Questions and Answers

Hydrocarbons Quiz Question Answer

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?       

NaNH2

 +(CH3)3COH X

The product X in the above reaction is -

            

The products formed when meta-xylene is treated with Br2 in the presence of FeBr3 are:-                                                                           

 

A compound that is formed on passing chlorine through propene at 400°C is -

  Allyl chloride  

The reactants used in Friedel-Craft's alkylation are -                             

C6H6 + CH3Cl

         KOHKMnO4BFeCl3Br2CH+C2H5OHD

The D in the above mentioned reaction is -

 

 

Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80-100°C forms -

1,3-Dinitrobenzene

In the following reaction,


Product A is-

 

The monochlorinated products (excluding stereo-isomers) obtained from the reaction is:

 

3-Hexyne can be converted to trans-3-Hexene by the action of:

Li-Liq. NH3

Hydrogen MCQ Questions

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Hydrogen Questions and Answers

Hydrogen Quiz Question Answer

Permutit is:

hydrated sodium aluminium silicate

Hydrogen is not obtained when zinc reacts with:

cold water

The volume strength of 1.5N H2O2 Solution is :

8.4

Density of water is maximum at:

4°C

Atomic hydrogen is obtained by:

passing silent electric discharge through hydrogen at low pressure

In the preparation of hydrogenated oil the chemical reaction involved is called as-

Hydrogenation

The most abundant isotope of hydrogen is-

Protium

Hydrogen is evolved by the action of cold dilute HNO3 on:

Mg or Mn

A molten ionic hydride on electrolysis gives:

H2 is liberated at anode

In solid hydrogen, the intermolecular bonding is:

van der Waals'

Organic Chemistry Basic Principles Techniques MCQ Questions

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Organic Chemistry Basic Principles Techniques Questions and Answers

Organic Chemistry Basic Principles Techniques Quiz Question Answer

Which is incorrect about enantiomorphs?

They have same configuration

How many geometrical isomers are possible of the following?

 CH3-CH=CH-CH=CH-CH3

2

Most stable radical is

 

Which of the following is the most stable carbonium ion?

 

Which of the following will have minimum C-Cl bond length?

Ph-Cl           

The maximum number of alkyl groups in C8H18 is:

6

Compounds which rotate plane polarised light clockwise direction are known as:

Dextrorotatory

The decreasing order of stability is-

D>C>B>A          

Glucose and fructose are-

Functional isomers

Which among the following is most basic?

 

Pblock Elements Xi MCQ Questions

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Pblock Elements Xi Questions and Answers

Pblock Elements Xi Quiz Question Answer

The incorrect statement among the following is -


 GeCl2 is more stable than GeCl4

Silicon carbide is used as:

  Abrasive

An incorrect statement among the following regarding Al2Cl6 is-

  Six AlCl bonds are of same length and two of different length

Heating an aqueous solution of aluminium chloride to dryness will give:

  Al2O3

Carbon dioxide is a gas but silica is a solid because:

     tetrahedral structure

  carbon dioxide is composed of discrete covalent CO2 molecules whereas silica has continuous

When a mixture of diborane and ammonia is heated, the final product is

  B3N3H6

The greatest percentage of CO is in:

  water gas

Which of the following shows bond in silicone?

  Si|OSi|OSi|

Mica is chemically:

  potassium alumino silicate having sheet structure

Borazine is obtained by reaction of:

  NH3+B2H6 in 2 : 1 ratio

Pblock Elements Xii MCQ Questions

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Pblock Elements Xii Questions and Answers

Pblock Elements Xii Quiz Question Answer

Only iodine forms hepta-fluoride IF7, but chlorine and bromine give Penta-fluorides. The reason for this is :

that the larger iodine atom can accommodate more number of smaller fluorine atom around it 

Chloride of an  element A gave a neutral solution in water. In the periodic table the element A belongs to

First group

The correct relationship between the pH of isomolar solutions of sodium oxide(pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4) is -

 pH1 > pH2 > pH3 > pH4

NO2 can be produced by heating -

AgNO3

The formation of PH4+ is difficult as compared to NH4+ because

Lone pair of phosphorous resides in almost pure s - orbital.

Concentrated nitric acid reacts with iodine to give:

HIO3

Partial Hydrolysis of one mole of peroxodi-sulphuric acid produces

One mole of sulphuric acid, one mole of peroxomono-sulphuric acid

Which of the following is the correct statement?

Boiling point increases down the group in halogens

Incorrectly matched characteristic is:

S8: covalent lattice

 Ncannot be produced by heating -

NH4Cl+CaO

Polymers MCQ Questions

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Polymers Questions and Answers

Polymers Quiz Question Answer
Natural rubber has -

All cis-configuration

Perlon is also known as -

Nylon-6

Acrilan is a hard,  wool-like feel and a high melting material. Which of the following represents its structure?

 -CH2-CH|CN-n

The polymer that can be classified as polyster polymer is : 

Terylene

Monomer of neoprene is: 

 

Which one of the following monomers gives the polymer neoprene on polymerization?

 

Structures of some common polymers are given. The incorrect representation among the following is: 

 

Neoprene 

Nylon-6, 10 is a polymer of:

Hexamethylenediamine and sebacic acid

Cellulose is a condensation polymer of

 β-glucose 

Toluene di-isocyanate is used to prepare

polyurethanes

Redox Reactions MCQ Questions

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Redox Reactions Questions and Answers

Redox Reactions Quiz Question Answer

Which of the following is redox reaction ?

Oxides of nitrogen form nitrogen & oxygen from lightning

Which of the following is a redox reaction ?

 2NaAgCN2+ZnNa2ZnCN4+2Ag

5mL of NHCl, 20 mL of N/2 H2SO4 and 30mL of N/3 HNO3 are mixed together and volume made one litre. The normality of the resulting solution is:

N/40

When a metal is burnt, its mass is increased by 24 percent. The equivalent mass of the metal will be:

33.3

1g of pure calcium carbonate was found to require 50 mL of dilute HCl for complete reactions. The strength of the HCl solution is given by:

0.4N

The equivalent mass of H3PO4 in the following reaction is,

H3PO+ Ca(OH)2 CaHPO4 + 2H2O

49

1.520g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent mass of metal is:

9.00

0.5 g of fuming H2SO4 (oleum) is diluted  with water. This solution is completely neutralised by 26.7 mL of 0.4 N NaOH. The percentage of free SO3 in the sample is:

20.6%

One g of a mixture of Na2CO3 and NaHCO3 consumes y equivalent of HCl for complete neutralisation. One g of the mixture is strongly heated, then cooled and the residue treated with HCl. How many equivalent of HCl would be required for complete neutralisation?

y equivalent

The chloride of a metal contains 71% chlorine by mass and the vapour density of it is 50. The atomic mass of the metal will be:

29

Sblock Elements MCQ Questions

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Sblock Elements Questions and Answers

Sblock Elements Quiz Question Answer

LiAlH4 is obtained by reacting an excess of ...... with an etheral solution of AlCl3.

LiH

Manufacture of NaOH is done by:

Castner - Kellner process

Sodium does not form Na2+ ,because:

First ionization potential is small and the difference in first and second ionization potential is very large.

Lithium is the only alkali metal which is not placed in kerosene but is wrapped in paraffin wax, because:

it floats to the surface of kerosene because of low density

Alkali metals are characterised by:

Good conductors of heat and electricity.

Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

A white precipitate appears which dissolves to give a colourless solution.

Which has lowest thermal stability?

Li2CO3

An alkali metal that reacts with nitrogen to form nitride is -

Li

Caustic soda is:

Deliquescent

The most basic oxide among the following is:

Na2O

Solid State MCQ Questions

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Solid State Questions and Answers

Solid State Quiz Question Answer

On the basis of unit cell concept a crystal has :

  7 systems

If NaCl is doped with 10-4 mol % of SrCl2, the concentration of cation vacancies will be

(NA = 6.023 x 1023 mol-1)                                                                             

6.023 x 1017 mol-1             

The phenomenon in which polar crystals on heating produce electricity is called:-


Pyro-electricity.

Total volume of atoms present in a face centred cubic unit cell of a metal is -

(r is atomic radius)

  16/3 πr3

Lithium borohydride (LiBH4), crystallizes in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are:- a = 6.81 Å , b = 4.43 Å ,c = 7.17 Å. If the molar mass of LiBH4 is 21.76 g mol-1.The density of the crystal is:-

0.67 g cm-3

The arrangement of Xions around A+ ion in solid AX is given in the figure (not drawn to scale).
If the radius of X is 250 pm, the radius of A+ is: 

104 pm

In an f.c.c. unit cell. atoms are numbered as shown below. The atoms not touching each other are (Atom numbered 3 is face centre of front face).

1&2

A solid has a bcc structure. If the distance of closest approach between the two atoms is 1.73Å . The edge length of the cell is:

200pm

Which is covalent solid?

All of these

What type of crystal defects is indicated in the diagram given below?

Schottky defect

Solutions MCQ Questions

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Solutions Questions and Answers

Solutions Quiz Question Answer

Which one of the following is incorrect for ideal solution ?

 Gmix=0

Which gas when passed through dilute blood will impart a cherry red colour to the solution?

CO

The vapour density of undecomposed N2O4 is 46. When heated, vapour density decreases to 24.5 due to its dissociation to NO2. The percent dissociation of N2O4 at the final temperature is: 

87                                         

At 298 K, 500cm3 H2O dissolved 15.30 cm3 CH4(STP) under a partial pressure of methane of one atm. If Henry's law holds, what pressure is required to cause 0.001 mole methane to dissolve in 300cm3 water ?

2.33 atm

The molal depression constant for water=1.85 deg/molal and for benzene is 5.12 deg/molal. If the ratio of the latent heats of fusion of benzene to water is 3:8, calculate the freezing point of benzene.

5.12°C

Which of the following colligative properties is associated with the concentration term 'molarity'?

Osmotic pressure

The vapour pressure of a dilute aqueous solution of glucose is 750 mm of mercury at 373 K. The mole fraction of solute in the solution is-

1/76

Which one of the folowing pairs of solution can we expect to be isotonic at the same temperature-

0.1 (M) Ca(NO3)2 and 0.1 (M) Na2SO4

The latent heat of vapourisation of water is 540 cal g-1 at 100°C. Kb for water is

1. 0.56 K.mole-1

2. 1.86 K.mole-1

 

3

Which of the following aqueous solution has osmotic pressure nearest to that an equimolar solution of K4[Fe(CN)6]?

Al2(SO4)3

States Matter MCQ Questions

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States Matter Questions and Answers

States Matter Quiz Question Answer

A gas diffuses four time quickly as oxygen. The molecular weight of gas is:

2

Which among the following mixtures of gases at room temperature does not obey Dalton's law of partial pressure-

NH3 and HCl

Themolecular radius for a certain gas = 1.25 A. What is a reasonable estimate of the magnitude of the van der Wails constant, b, for the gas?

1.97 × 10–2 litre/mole

At lower temperature, all gases except H2 and He show:

Negative deviation

2 gms of hydrogen diffuses from a container in 10 minutes. How many gms of oxygen would diffuse through the same time under similar conditions?

8 gm

The mean free path (λ) of a gas sample is given by:

 λ=1/2πσ2N

Which is lighter than dry air?

Moist air                             

The ratio a/b (the terms used in van der Waals' equation) has the unit-

All of the above

At relatively high pressure, van der Waals' equation reduces to-

PV = RT + Pb

The maximum deviation from ideal gas behaviour takes place -  

At low temperature and high pressure

Structure Atom MCQ Questions

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Structure Atom Questions and Answers

Structure Atom Quiz Question Answer

The number of d- electrons retained in Fe2+ :

6

Which of the following sets of quantum numbers is not possible?

 n = 3, l= 3, m = -3, s = 1/2

Which of the following sets of quantum numbers represent an impossible arrangement - 

       n   l    m     s

    3   2   -3    (+)1/2

How many unpaired electrons are present in Ni2+ cation (atomic number = 28)

2

Number of unpaired electrons in 1s2 2s2 2p3 is -

3

The quantum numbers of four electrons are given below.

                                  n            l           m          s 

(1) Electron 1             3            0             0           -1/2

(2) Electron 2             4            0             0           1/2

(3) Electron 3            3             2             0           1/2

The correct order of decreasing energy of these electrons is - 

1. Electron 3 > Electron 1 > Electron 4> Electron 2

2. Electron 4> Electron 2 > Electron 3 > Electron 1

Which type of radiation is not emitted by the electronic structure of atoms:

y-rays

An absorption line of the lowest frequency in the transition of hydrogen spectra is

n=3 to n=8

If uncertainty in the position of an electron is zero the uncertainty in its momentum will be

infinite

The maximum number of atomic orbitals associated with a principal quantum number 5 is-

25

Surface Chemistry MCQ Questions

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Surface Chemistry Questions and Answers

Surface Chemistry Quiz Question Answer

Flocculation value is expressed in terms of:

Millimole per litre.

Compound that acts as inhibitor for knocking in combustion of petrol is : 

Both (1) and (2)             

Which does not show the Tyndall effect?

Sugar solution

Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is:

 CH3CH215N+CH33Br-

Butter is a colloid form in which:

water is dispersed in fat

The cotterells precipitator is used to :

all of the above

Foam is a colloidal solution of:

Gaseous particles dispersed in a liquid           

A liquid aerosol is a colloidal system of:

a liquid dispersed in a gas

A negative catalyst or inhibitor is one:

which retards the rate of reaction

Alum helps in purifying water by:

Aluminium which coagulates the mud particles.

Thermodynamics MCQ Questions

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Thermodynamics Questions and Answers

Thermodynamics Quiz Question Answer

All the naturally occurring processes, i.e., spontaneous proceed spontaneously in a direction that leads to:

decrease of free energy                     

A gaseous system changes from state A(P1, V1, T1) to B(P2,V2,T2), B to C(P3, V3, T3) and finally from C to A. The whole process may be called:

cyclic process

Warming ammonium chloride with sodium hydroxide in a test tube is an example of:

 

open system

Work done in the reversible adiabatic process is given by:

 nR (γ-1)(T2-T1)

Change in enthalpy for reaction,

2H2O2(l) 2H2O(l) + O2(g)

If the heat of formation of H2O2(l) and H2O(l) are -188 and -286 kJ/mol respectively is -          

-196 kJ/mol             

One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K)(4.0 atm, 5.0 L, 245 K) with a change in internal energy, U = 30.0 L atm. The change in enthalpy (H) of the process in L atm is:

44.0

At absolute zero, the entropy of a perfect crystal is zero. This is........... of thermodynamics.

Third law             

At constant pressure and temperature, the direction of any chemical reaction is one where the...... decrease.

Gibbs energy       

The work done by a mass less piston in causing an expansion V (at constant temperature), when the opposing pressure, P is variable, is given by:

W= -PV               

Entropy decreases during:

crystallization of sucrose from solution