NEET Chemistry MCQS - Important Questions and answers

Williamson's synthesis reaction, among the following is -

C₂H₅I + C₂H₅ONa$\to$C₂H₅.O.C₂H₅ + NaI

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

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                       

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

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....

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 -

 ${\mathrm{CH}}_3-\mathrm{NH}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

The compound A and B respectively are

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 H₂ 

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 $0°\mathrm{C}$ 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

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 $\stackrel{\mathrm{Enzyme} \left(\mathrm{A}\right)}{\to }$ Polypeptides  $\stackrel{\mathrm{Enzyme} \left(\mathrm{B}\right)}{\to }$ 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 ?

The strongest hydrogen bond present among the following is-

 $\mathrm{F}—\mathrm{H}‐‐‐\mathrm{F}$

Which of the following is the most basic oxide?

 $B{i}_2{O}_3$

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

() $NO\to N{O}^{+}$

Among the following, which has the maximum hydration energy?

H⁺

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

Which of the following pairs of species have similar shapes?

 ${\mathrm{PCl}}_3, {\mathrm{NH}}_3$

Incorrect statement about resonance is :

Hybrid structure is most energetic.

Which of the following species deviates from the octet rule?

 $H_{2}S{O}_3$

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

${\mathrm{BrF}}_3$

In piperidine "N" atom has hybridization:

 $s{p}^3$

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 $\to$ 2AB mechanism as given below;

A₂ $\rightleftharpoons$A+ A          ............(Fast)

A+B₂ → AB + B   ............(Slow)

A+ B → AB         ............(Fast)

The order of the overall reaction is:

1.5

Following mechanism has been proposed for a reaction,

2A+B $\to$D+E

A+B$\to$ C+D    ...(Slow)

A+ C$\to$ 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 E_a is 77 kJ mol^-1, then E_a for the bimolecular recombination of two OH radicals to form H₂O and O is:

5 kJ mol^-1

For a reaction A$\stackrel{ }{\to }$ Product, rate law is $-\frac{d\left[A\right]}{dt}=K[A{]}_0$. The concentration of A left after time t when $t=\frac{1}{K}$ is:

 $\frac{[A{]}_0}{e}$

For an exothermic chemical process occurring in two steps as;

(i) A+B$\to$X(Slow)

(ii) X$\to$AB (Fast)

The progress of the reaction can be best described by:

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

The rate law for the formation of C is:

d[C]/dt = k[ A]

For the reaction N₂ + 3H₂ $\to$ 2NH₃, the rate $\frac{\mathrm{d}\left[{\mathrm{NH}}_3\right]}{\mathrm{dt}}$= 2 x 10^-4 M s^-1 .Therefore, the rate $\frac{-\mathrm{d}\left[{\mathrm{N}}_2\right]}{\mathrm{dt}}$ 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?

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

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 > Cl₂ > 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.

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

Cu²⁺+4CN$\rightleftharpoons$[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 ?

 $\mathrm{Mn}(\mathrm{CO}{)}_6$       

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  $\mathrm{\pi }$-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.

 The colourless species among the following are :

${\mathrm{TiF}}_6^{2-}$ and Cu₂Cl₂ 

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: $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{14}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$

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

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

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

Velocities of both K⁺ and ${\mathrm{NO}}_3^{-}$ 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⁺

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?

$$\begin{gathered} 1. {\mathrm{N}}_2{\mathrm{O}}_5 \\ 2. {\mathrm{NO}}_2 \\ 3. {\mathrm{N}}_2\mathrm{O} \\ 4. \mathrm{NO} \end{gathered}$$

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

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 ($\mathrm{\alpha }$) obeying the equilibrium,

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

  $\alpha \propto 1/\sqrt{P}$

In a system: $A\left(\mathrm{s}\right)\stackrel{ }{\rightleftharpoons }2B\left(\mathrm{g}\right) + 3C\left(\mathrm{g}\right).$ If the concentration of C at eqilibrium is increased by a factor 2, it will cause the eqilibrium concentration of B to change to:

 $\frac{1}{2\sqrt{2}}$ times of its original value

 A weak acid, HA has a K_a 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 $\rightleftharpoons$ liquid equilibrium in a sealed container, then:

No change in P and T

In the equilibrium,

2SO₂(g) + O₂ (g) $\rightleftharpoons$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 $\rightleftharpoons$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

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

When CH₃CH₂CHCl₂ is treated with NaNH₂, the product formed is                             

CH₃-C$\equiv$CH

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

R-CH₂-CCl₂-R $\stackrel{\mathrm{Reagent}}{\to }$R-C$\equiv$C-R. The reagent is

KOH in C₂H₅OH

Ethyl chloride is converted into diethyl ether by -                                                  

The alkyl halide is converted into an alcohol by                                    

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 ${\mathrm{S}}_{{\mathrm{N}}^2}$ reactions, the correct order of reactivity for the following compounds : ${\mathrm{CH}}_3\mathrm{Cl}$, ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$, ${\left({\mathrm{CH}}_3\right)}_2\mathrm{CHCl}$ and ${\left({\mathrm{CH}}_3\right)}_3\mathrm{CCl}$ is :

 ${\mathrm{CH}}_3\mathrm{Cl}$>${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$>${\left({\mathrm{CH}}_3\right)}_2\mathrm{CHCl}$>${\left({\mathrm{CH}}_3\right)}_3\mathrm{CCl}$

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

NaNH₂

 +$({\mathrm{CH}}_3{)}_3\mathrm{COH}\to$ 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

         $\underset{KOH}{\overset{KMn{O}_4}{\to }}B\underset{FeC{l}_3}{\overset{B{r}_2}{\to }}C\underset{H^{+}}{\overset{C_2{H}_{5}OH}{\to }}D$

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:

5 

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

Li-Liq. ${\mathrm{NH}}_3$

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'

Which is incorrect about enantiomorphs?

They have same configuration

How many geometrical isomers are possible of the following?

 CH₃-CH=CH-CH=CH-CH₃

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?

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-

Glucose and fructose are-

Functional isomers

Which among the following is most basic?

The incorrect statement among the following is -

 ${\mathrm{GeCl}}_2$ is more stable than ${\mathrm{GeCl}}_4$

Silicon carbide is used as:

  Abrasive

An incorrect statement among the following regarding Al₂Cl₆ is-

  Six $\mathrm{Al}—\mathrm{Cl}$ bonds are of same length and two of different length

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

  ${\mathrm{Al}}_2{\mathrm{O}}_3$

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

     tetrahedral structure

  carbon dioxide is composed of discrete covalent ${\mathrm{CO}}_2$ molecules whereas silica has continuous

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

  ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

The greatest percentage of $\mathrm{CO}$ is in:

  water gas

Which of the following shows bond in silicone?

  $—\stackrel{\mathbf{|}}{\mathrm{Si}}—\mathrm{O}—\stackrel{\mathbf{|}}{\mathrm{Si}}—\mathrm{O}—\stackrel{\mathbf{|}}{\mathrm{Si}}—$

Mica is chemically:

  potassium alumino silicate having sheet structure

Borazine is obtained by reaction of:

  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 2 : 1 \mathrm{ratio}$

Only iodine forms hepta-fluoride ${\mathrm{IF}}_7$, 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 -

 ${\mathrm{pH}}_1 > {\mathrm{pH}}_2 > {\mathrm{pH}}_{3 }> {\mathrm{pH}}_4$

NO₂ can be produced by heating -

AgNO₃

The formation of ${\mathrm{PH}}_4^{+}$ is difficult as compared to ${\mathrm{NH}}_4^{+}$ 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

 N₂ cannot be produced by heating -

NH₄Cl+CaO

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?

 ${\left(-{\mathrm{CH}}_2-\underset{\mathrm{CN}}{\underset{|}{\mathrm{CH}}}-\right)}_n$

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

 $\mathrm{\beta }$-glucose 

Toluene di-isocyanate is used to prepare

polyurethanes

Which of the following is redox reaction ?

Oxides of nitrogen form nitrogen & oxygen from lightning

Which of the following is a redox reaction ?

 $2\mathrm{Na}\left[\mathrm{Ag}{\left(\mathrm{CN}\right)}_2\right]+\mathrm{Zn}\to {\mathrm{Na}}_2\left[\mathrm{Zn}{\left(\mathrm{CN}\right)}_4\right]+2\mathrm{Ag}$

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,

H₃PO₄ + Ca(OH)₂ $\to$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

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

On the basis of unit cell concept a crystal has :

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

(N_A = 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 $\pi$r³

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 X^- ions 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: 

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

Which one of the following is incorrect for ideal solution ?

 $∆{\mathrm{G}}_{\mathrm{mix}}=0$

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$°\mathrm{C}$

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-

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$°\mathrm{C}$. K_b for water is

1. 0.56 K.mole^-1

2. 1.86 K.mole^-1

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

Al₂(SO₄)₃

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 ($\mathrm{\lambda }$) of a gas sample is given by:

 $\lambda =1/\sqrt{2}\pi {\sigma }^{2}N$

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

The number of d- electrons retained in Fe^{2+ :}

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            $\mathcal{l}$           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

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:

 ${\mathrm{CH}}_3{\left({\mathrm{CH}}_2\right)}_{15}{\mathrm{N}}^{+}{\left({\mathrm{CH}}_3\right)}_3{\mathrm{Br}}^{-}$

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.

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:

 $\frac{\mathrm{nR} }{(\mathrm{\gamma }-1)}({\mathrm{T}}_2-{\mathrm{T}}_1)$

Change in enthalpy for reaction,

2H₂O₂(l)$\to$ 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)$\to$(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= $-\int \mathrm{P}∆\mathrm{V}$               

Entropy decreases during:

crystallization of sucrose from solution