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Chemical Bonding And Molecular Structure Quiz Question | Answer |
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The strength of sigma bonds formed by axial overlap of $$s-$$ or $$p-$$ orbitals of $$2nd$$ shell of participating atom decreases as: | $$p-p>s-p>s-s$$ |
Which one of the of the following molecules is expected to have zero dipole moment? | $$CO_2$$ |
The number of P-O-P and P-O-H bonds present respectively in pyrophosphoric acid molecule are_____ | 1,4 |
Which formulae does not correctly represents the bonding capacity of the atom involved? | |
The number of electron pairs in $$Xe{F}_{4}$$ at the corners of the square are _______. | 4 |
What is the electronic configuration of elements of $$III$$ rd group | $$1{ s }^{ 2 },2{ s }^{ 2 }2{ p }^{ 6 },3{ s }^{ 2 }3{ p }^{ 1 }$$ |
For which of the following molecule significant $$ \mu \neq 0?$$ |
$$ (c)\: and\:(d)$$ |
Identify the pair in which the geometry of the species is T-shape and square pyramidal, respectively. | $$XeOF_2$$ and $$XeOF_4$$ |
Boron cannot form which one of the following anions? | $$\mathrm{B}\mathrm{F}_{6}^{3-}$$ |
The number and type of bonds in $$C_{2}^{2-}$$ ion in $$CaC_2$$ are : | one $$\sigma$$ bond and two $$\pi$$-bonds |
Classification Of Elements And Periodicity In Properties Quiz Question | Answer |
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The element with configuration $$1s^2 2s^2 2p^6 3s^2$$ would be | A metal |
The basic character of $$MgO, SrO, K_2O$$ and $$NiO$$ increases in the order: |
$$NiO < MgO < SrO < K_2O$$ |
IUPAC symbol of atomic number $$119$$. | $$Uue$$ |
The electronic configuration with the highest ionization enthalpy is: | $$[Ne]3s^2\,3p^3$$ |
Aqueous solution of which salt will not contain ions with the electronic configuration $$1{s}^{2} 2{s}^{2} 2{p}^{6} 3{s}^{2} 3{p}^{6}$$? | $$NaF$$ |
The atomic numbers of elements $$A, B, C$$ and $$D$$ are $$Z-1, Z, Z+1$$ and $$Z+2$$, respectively. If $$'B'$$ is a noble gas, choose the correct answers from the following statements (1) $$'A'$$ has higher electron affinity (2) $$'C'$$ exists in $$+2$$ oxidation state (3) $$'D'$$ is an alkaline earth metal |
(1) and (3) |
The halogen with highest ionisation potential is : |
F |
Identify the element with atomic number 10. |
Neon |
The metal having highest ionisation potential is : |
lithium |
Diagonal relationship is shown by : |
elements of third period |
Environmental Chemistry Quiz Question | Answer |
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The layer of atmosphere between $$10\ km$$ to $$50\ km$$ above the sea level is called as: | stratosphere |
The regions of the atmosphere, where clouds form and where we live respectively, are: | Troposphere and Troposphere |
Biochemical Oxygen Demand $$(BOD)$$ is the amount of oxygen required (in ppm) : |
by bacteria to break-down organic waste in a certain volume of a water sample. |
Biochemical Oxygen Demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct? | Polluted water has BOD value higher than $$10$$ ppm |
Which is wrong with respect to our responsibility as a human being to protect our environment? | Using plastic bags |
Depletion of which gas in the atmosphere can lead to an increase incidence of skin cancers? | Ozone |
World ozone day is celebrated on __________ | $$16^{th}$$ September |
Ozone in stratosphere extends | 20-25km |
The stratospheric ozone depletion leads to? | All of the above |
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. |
Equilibrium Quiz Question | Answer |
---|---|
Which of the following is strongest conjugate base | $$\,\,{{\text{P}}^{\text{ - }}}\,\,$$ |
Which of the following combination will act as a buffer? | $$CH_{3}COOH + NaOH$$ (Molar ratio 2:1) |
Number of buffers can be made by reaction of $$ H_3PO_4 $$ and NaOH is | 3 |
$$HCOO^- + H_2O \rightleftharpoons HCOOH + OH^-$$ is related:- | $$h=\sqrt{\frac{K_h}{C}}$$ |
Percentage dissociation of a $$0.024 M$$ solution of a weak acid $$HA$$ is: ($${K_a}=2 \times 10^{-3}$$) |
$$ \approx 29 \%$$ |
Which of the following is the correct order of hydrated radii? | $$Cs^{+}$$ < $$Rb^{+} $$<$$K^{+} $$<$$ Na^{+}$$ < $$Li^{+}$$ |
For an acidic indicator has $$K_{a}$$ value of $$10^{-5}$$. The $$\%$$ basic form when $$pH$$ equal to $$5.3$$ is : [Given $$\log 2=0.3$$] |
$$66.66$$ |
When a strong base $$NaOH$$ is added to the acidic buffer containing $$CH_3COOH+CH_3COONa$$ then which of the following reaction occurs? | $$CH_3COOH+NaOH \rightarrow CH_3COONa+H_2O$$ |
Calculate the ratio of solubility of $$AgCl$$ in 0.1 M $$AgNO_3 $$ and in pure water. Given : $$ K_{sp} (AgCl) = 1.8 \times 10^{-10} $$ |
$$ 1.34 \times 10^{-4} M $$ |
What is the $$pH$$ of a solution of $$0.28\ M$$ acid and $$0.84\ M$$ of its conjugate base if the ionztion constant of acid is $$4\times 10^{-4}$$? | $$3.88$$ |
Hydrocarbons Quiz Question | Answer |
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Acetylene reacts with excess of hypochiorous acid to produce |
Dichloroacetaldehyde. |
In which case butane is formed ? | $$ 2C_2H_5 -CI+Na $$ |
$$CH_3CH=CH-CH_2-CO_2H\xrightarrow[\Delta]{}(X) $$ (major); Product (X) is : | $$CH_3CH=CH-CH_3$$ |
Electromagnetic radiation with maximum wavelength is | radio waves |
$$IUPAC$$ name of the following compound is: |
7- ethyl- 3,3, 4- trimethyl decane |
Which of the following alkane gives only two mono chloro-derivatives? | propane |
Alkanes can be obtained by the hydrolysis of | $$ \mathrm{Al}_{4} \mathrm{C}_{3} $$ |
Methane is obtained from among the following: | Both A and B |
When the given compound undergoes Hoffmann methylation, the major product of the reaction: | |
Which of the following is not a pair of isomers: |
Propene and Cyclopropene |
Hydrogen Quiz Question | Answer |
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The reaction of water with ammonia is given the following equation, $$H_2O+NH_3\rightleftharpoons NH^+_4+OH^-$$. In this reaction water behaves as : | acid |
Assertion: $$H_{2}O$$ is the only hydride of the chalcogens which is liquid. Reasons:In ice, each $$O$$ atom is surrounded by $$4H$$ atoms. |
Both A and R are correct but R is not the correct explanation of A |
The photolysis of water gives the substance | $$OH^- + H^+$$ |
Hydrogen can be put in halogen group because | It forms hydrides like chlorides |
In the reaction $$2H_2O \rightleftarrows H_3O^+ +OH^-$$, water is: | Both a weak acid and a weak base |
Only one element of ________ forms hydride. | group 6 |
Sodium on reaction with cold water produces a residue. The nature of residue is: | colourless, soapy and slightly warm |
Which of the following combination will produce $$H_{2}$$ gas? | $$Zn$$ metal and $$NaOH(aq)$$ |
Assertion: The $$O-O$$ bond length in $$H_2O_2$$ is shorter than that of $$O_2F_2$$. Reason: $$H_2O_2$$ is an ionic compound. |
If both the assertion and reason are false |
Which of the following process is not used in the concentration of $$H_{2}O_{2}$$? |
Sublimation |
Organic Chemistry Some Basic Principles And Techniques Quiz Question | Answer |
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What is the prefix if the number of carbon atoms is $$3$$? | Prop- |
Number of $$\pi$$-bods in the following compound $$\dfrac{CH_3C \equiv CN}{3}$$ | none |
Correctly match is : | $$\sigma_{P_x}$$ -- $$\psi$$ (gerade) |
Prefix used for $$-COOH$$ functional group is : | Carboxy |
Above Gauche form is stable when Z is: |
|
$$IUPAC$$ name of $$[VO(O_{2})(acac)_{2}]$$ is | bis(acetylacetonato)oxoperoxonanadium(VI) |
Urea was first organic compounds to be synthesised by: | wohlar |
The functional groups which is not present in the given compound is: |
Amide |
Which functional group is present in a molecule of $${CH}_{3}O{CH}_{2}{CH}_{3}$$? | Ether |
Select the option having incorrect named compound(s) : (I) 3, 3-dimethyl-1-hydroxycyclohexane (II) 4-ethoxy-2-methoxypentan-3-one (III) 2-ethyl-1, 1-dimethylcyclopentane (IV) 4-amino-2-hydroxy-4-oxobutanal |
II and IV |
Redox Reactions Quiz Question | Answer |
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The oxidation number of sulphur is -4 in | $${\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{3}}}$$ |
What are the oxidation numbers of '$$N$$' in $${ NH }_{ 4 }N{ O }_{ 3 }$$? | -3, +5 |
Is the compounds is according to decreasing order of the oxidation state of nitrogen? $$HNO_3$$>$$ NO$$>$$N_2$$> $$NH_4Cl$$ |
True |
In the reaction : $$xBrO_{3}^{-}+yCr^{3+}+zH_{2}O\rightarrow Br_{2}+CrO_{4}^{2-}+H^{+}$$ The coefficient $$x,\ y$$ and $$z$$ are: |
$$6,10,22$$ |
$$CrO^{2-}_4 \overset{pH=x}{\rightarrow}Cr_2O^{2-}_7 \overset{pH=y}{\rightarrow}CrO^{2-}_4$$. x and y can be |
3 and 8 |
Oxygen exhibit $$-1$$ oxidation state in: | $$H_{2}O_{2}$$ |
Which is not redox change ? | $$CaCO_{3} \rightarrow CaO+CO_{2}$$ |
(i) $$Br_2+2NaOH[cold] \rightarrow NaBr+(X)+H_2O$$ (ii) $$2Br_2+6NaOH[hot]\rightarrow NaBr+(Y)+H_2O$$ What is the oxidation number of $$Br$$ in $$(X)$$ and $$(Y)$$ respectively? |
$$+1,+5$$ |
Identify the element that can have only two oxidation states. | Fluorine |
The highest oxidation state of Mn is shown by | $${\rm{KMn}}{{\rm{O}}_4}$$ |
Some Basic Concepts Of Chemistry Quiz Question | Answer |
---|---|
Avogadro's number of Krypton atoms (Atomic weight = $$83.8 u$$) weigh: | $$83.8 g$$ |
Which gas law relates the volume of a gas to the number of molecules of the gas? |
Avogadro's Law |
What is a chemical reaction? | Rearrangement of electrons in a chemical bond. |
When magnesium is burnt in air, the weight of magnesium : | increases |
What percent of a sample of nitrogen must be allowed to escape if its temperature, pressure, and volume are to be changed from $$220^oC$$,3 atm and 1.65 L to $$110^oC$$, 0.7 atm and 1 L respectively? | $$81.8\%$$ |
A mixture of $$S{O_2}$$ and $${O_2}$$ was made to react in such a way that every gram of mixture gives maximum amount of $$S{O_3}$$. The mass % of $$S{O_2}$$ in the mixture is | 80 % |
What is atomic mass of $$He$$ in amu $$(u)$$ units? | $$4$$ |
What should be the weight of $$50\%$$ $$HCl$$ which reacts with $$100g$$ of limestone? | $$50%$$ pure |
If Avogadro number $$N_A$$ is changed from $$6.022\times 10^{23} mol^{-1}$$ to $$6.022\times 10^{20} mol^{-1}$$, this would change : | the mass of one mole of carbon |
A certain sample of element Z contains 60% of $$^{69}{Z}$$ and 40% $$^{71}{Z}$$ . What is the relative atomic mass of element Z in this sample? | 69.8 |
States Of Matter Gases And Liquids Quiz Question | Answer |
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Which of the following gas mixture is not applicable for Dalton's law of particle pressure? | $$SO_2$$ and $$Cl_2$$ |
The value of gas constant per mole is approximately- | $$2\ cal$$ |
A constant gas temperature is based on | Charles's law |
Gay Lussac law gives relation between: | $$P\,$$and$$\,T$$ |
The three phases of water (Solid, Liquid, Gas) are: | ice, water, steam |
Identify which of the following statements is FALSE? | During a phase transition, the temperature of a substance must be constant. |
$$\Delta_f G^{\circ}$$ at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcal $$mol^{-1}$$ respectively. Vapour pressure of liquid 'S'' at 500 K is approximately equal to: $$R = 2 cal K^{-1} mol^{-1}$$ |
0.1 atm |
All kind of matter is made up of extremely small particles called ___________. | atom |
Which term describes the mass of $$6.022\times { 10 }^{ 23 }$$ representative particles? | Molar mass |
Total pressure of a gaseous mix is equal to the sum of the Partial Pressures is: |
Dalton's law |
Structure Of Atom Quiz Question | Answer |
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The magnetic field at the center of a hydrogen atom due to the motion of electron varies with the principal quantum number as | $$1/n^{5}$$ |
The equivalent weight of a metal is 4.5 and the molecular weight of its chloride isFind the atomic weight of the metal. | 9 |
Which of the following statements about the radioactivity of an element is incorrect? | Its rate is affected by change in temperature and/or pressure |
The Bohr model for the spectra of a H- atom | Will not be applicable for a He - atom |
An element 'A' emits an $$\alpha$$ -particle and forms 'B'. 'A' and 'B' are | Isodiapheres |
Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying $$0.5\ V$$ when the radiation of $$250\ nm$$ is used. The work function of the metal is: | $$4.5\ eV$$ |
Which of the following has the correct combination considering $$List-I$$ and $$List-II$$? |
$$(I),(T)$$ |
For which one of the following, Bohr model is not valid? |
Singly ionised neon atom $$(Ne^+)$$ |
Assertion: Atoms are not electrically neutral. Reason: Number of protons and electrons are different. |
Both assertion and reason statements are wrong. |
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. |
The P-Block Elements Quiz Question | Answer |
---|---|
The correct B --- F bond length follows the sequence : | $${ { BF }_{ 3 } }\quad <\quad { BF }_{ 4 }^{ - }\quad <\quad { BF }_{ 2 }{ OH }\quad <\quad { BF }_{ 2 }{ NH }_{ 2 }$$ |
Which of the following is a semiconductor? | $$Ge$$ |
Which of the following statements is correct? | Electron precise hydrides have tetrahedral geometries |
Colemanite is a mineral of: | $$B$$ |
Which of the following forms $$M_{2}O$$ type of oxide? | Tl |
The possible oxidation state of Tl are: | +1 and +3 |
The species, having bond angles of $$120^{\circ}$$ is: | $$BCl_3$$ |
In the following statements, select the correct statement : |
$$N(SiH_3)_3$$ shows planar arrangement. |
Hybridisation of silicon atom in silica is : |
$$sp^{3}$$ |
Aluminium is usually found in $$+3$$ oxidation state. In contrast, thallium exists in $$+1$$ and $$+3$$ oxidation states. This is due to : | inert pair effect |
Thermodynamics Quiz Question | Answer |
---|---|
A chemical reaction is spontaneous at 298 K but non-spontaneous at 350 K. Which one of the following is true for the reaction? | $$\Delta G\quad \Delta H\quad \Delta S\\ -\quad \quad -\quad \quad -$$ |
Which of the following statements regarding Gibb's energy change is correct? | If $$\Delta$$G is negative (< 0), the process is spontaneous. |
$$\triangle H$$ = - 336.2 kcal. What is the value of $$\triangle U$$ approximately at 300 K for the same reaction (R = 2 cal $$degre{ e }^{ -1 }$$ $$mo{ l }^{ -1 }$$)? |
- 335.0 kcal |
Properties of substances like pressure, temperature and density, in thermodynamic coordinates are | point function |
The INCORRECT match in the following is : | $$\Delta G^0 < 0,K< 1$$ |
Which of the following property is not a thermodynamic property of the system? | heat |
Which heat depends on the direction of current? | Peltier heat |
An ideal gas undergoes a cyclic process as shown in Figure. $$\Delta U_{BC}=-5$$ kJ $$mol^{-1}$$, $$q_{AB}=2$$ kJ $$mol^{-1}$$ $$W_{AB}=-5$$ kJ $$mol^{-1}$$, $$W_{CA}=3$$ kJ $$mol^{-1}$$ Heat absorbed by the system during process CA is: |
$$+5$$ kJ $$mol^{-1}$$ |
The combustions of benzene (l) gives $$CO_2(g)$$ and $$H_2O(l)$$. Given that heat of combustion of benzene at constant volume is $$-3263.9 \ kJ\, mol^{-1}$$ at $$25^oC$$, heat of combustion (in $$kJ\,mol^{-1}$$) of benzene at constant pressure will be: $$(R =8.314JK^{-1}\,mol^{-1})$$ |
$$-3267.6$$ |
The standard Gibbs energy for the given cell reaction in $$kJ$$ $${mol}^{-1}$$ at $$298K$$ is:$$Zn(s)+{Cu}^{2+}(aq)\rightarrow {Zn}^{2+}(aq)+Cu(s)$$ $${E}^{o}_{cell}=2V$$ at $$298K$$ (Faraday's constant, $$F=96000\ C{mol}^{-1}$$) |
$$-384$$ |
The S-Block Elements Quiz Question | Answer |
---|---|
Which of the following is organometalic compound | Methyl lithium |
Incorrect statement about given carbohydrate is |
Above compound is a non-reducing sugar |
Which of the following product is obtained when bleaching powder is distilled with acetone? | none of the above |
Lithium react less vigorously with water than other metals. Give reason behind it. | Lithium has small size and very high hydration energy. |
Diagonal relationship is found in between | $$A\ and\ C\ both$$ |
The alkaline earth metal ion present in chlorophyll is | $$Mg$$ |
Among the alkaline earth metals, the element forming predominantly covalent compounds is | Be |
The ionization energy of a hydrogen atom is 13.6eV. The energy of the third-lowest electronic level in doubly ionized lithium (Z=3) is: | -122.4eV |
Correct order is : | $$\mathrm { MgO } < \mathrm { NiO } < \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { CS } _ { 2 } {O } $$ (basic strength ) |
The melting point of lithium (181$$^\circ$$C) is just double the melting point of sodium (98$$^\circ$$C) because | down the group, the cohesive energy decreases |
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