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Paper 1 CHEMISTRY MULTIPLE CHOICE QUESTIONS (SINGLE OPTION CORRECT)

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CHEMISTRY

 

Multiple Choice Questions (Single Option Correct)
  1. If there were three possible values for the spin magnetic quantum number, ms, how many elements would there be in the 5th period of the periodic table?

(A)  28                                                               (B)  48

(C)  50                                                               (D)  32

  1. B
  2. n = 5

Total = 3 in 5s

Total = 9 in 5p

Total = 15 in 5d

Total = 21 in 5f

Total elements = 3 + 9 + 15 + 21 = 48

 

  1. Predict the total spin in Ni2+ ion.

(A)                                                              (B)

(C)                                                              (D)

  1. D
  2. where n is the number of unpaired electrons.

 

  1. Which state of triply ionized beryllium has the same radius as that of ground state of hydrogen atom?

(A)  1                                                                (B)  2

(C)  3                                                                (D)  4

  1. B

 

  1. 50 ml of 1 M oxalic acid is shaken with 0.5 gm of wood charcoal. The final concentration of the solution after adsorption is 0.5 M. Amount of oxalic acid absorbed per gm of charcoal is

(A)  3.45 gm                                                      (B)  3.15 gm

(C)  6.30 gm                                                      (D)  None

  1. C

 

  1. When 12 g of methanol (CH3OH) was treated with excess oxidizing agent (MnO4), 14 g of formic acid (HCOOH) was obtained. Using the following chemical equation, calculate the percent yield. (The reaction is much more complex than this; please ignore the fact that the charges do not balance.)

3CH3OH + 4MnO4 3HCOOH + 4MnO2

(A) 100%                                                           (B) 92%

(C) 82%                                                            (D) 70%

(E) 55%

  1. C

 

  1. Which of the following statements regarding d-orbitals is/are correct?

(i)   It has four lobes and two angular nodes.

(ii)   It has four lobes and one node.

(iii)  The orbital angular momentum of electron in this orbital is

(iv)  It is non-degenerate.

(A)  Only (i)                                                        (B)  (i) and (iii)

(C)  (ii) and (iii)                                                   (D)  (i) and (iv)

  1. B

 

  1. In a photoelectric effect experiment, photons of energy 5 eV are incident on a metal surface. They liberate electrons which are just stopped by an electrode at a potential of 3.5 V with respect to the metal. The work function of the metal surface in eV is

(A)  5                                                                (B)  3.5

(C)  1.5                                                              (D)  7

  1. C
  2. Absorbed energy Work function (W) + Kinetic energy (Kmax)

 

W = 1.5 eV

Hence, (C).

 

  1. Consider the following reaction:

NH3(g) + H2O(l) NH4+(aq) + OH(aq)

Which one of the following statements is false?

(a) The double arrows indicate that ammonia, NH3, is only very slightly soluble in water.

(b) The reaction is reversible.

(c) When ammonia is added to water, NH4+ and OH ions are produced in a 1:1 ratio.

(d) When solutions of NH4Cl and NaOH are mixed, some ammonia is produced.

(e) Ammonia is considered to be a weak base.

  1. A

 

  1. Ratio of Cp and Cv of a gas X is 1.4. The number of atoms of gas X present in 11.2 litres of it at NTP is:

(A)  6.0 ´ 1023                                                    (B)  1.2 ´ 1024

(C)  3.01 ´ 3.01 ´ 1023                                         (D)  2.01 ´ 1023

  1. A

 

 

 

34.

B is

(A) (B)
(C) (D)
  1. B

 

  1. The product of the following reaction is

 

(A) (B)
(C) (D)
  1. B

 

  1. The density of gold is 19 g/cm3. If 1.9 × 10-4 g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per mm3 of the sol will be

(A)  1.9 × 1012                                                    (B)  6.3 × 1014

(C)  6.3 × 1010                                                    (D)  2.4 × 106

  1. D

 

 

Multiple Choice Questions (Multiple Options Correct)

 

  1. The electrolysis of water for manufacturing hydrogen gas is always carried out in the presence of acid (H2SO4) or alkali (KOH), yet no or K+ ions are discharged because

(A)  discharging potential of  is much higher than OH

(B)  K+ ion has higher positive charge density

(C)  discharging potential of K+ ions is much higher than H+ ions

(D)  addition of acids or alkalies increases the conductivity of water

  1. A, C

 

  1. The compounds which are coloured only due to charge transfer are

(A)  KMnO4                                                        (B)  K2Cr2O7

(C)  Fe(OH)3                                                       (D)  Cr(OH)3

  1. A, B
  2. Cr in K2Cr2O7 and Mn in KMnO4 have no unpaired electrons and are coloured due to charge transfer.

 

  1. In Arrhenius’ equation, A may be regarded as the

(A)  rate constant at very high temperature

(B)  maximum rate constant

(C)  rate constant at negligible activation energy

(D)  rate constant at very low temperature

  1. A, B, C

 

  1. Which of the following statements are correct about half-life period?

(A)  It is proportional to the initial concentration for zero order.

(B)  Mean life is 1.44 times the half-life for the first order reaction.

(C)  99.9% reaction takes place in 10 minutes only when the rate constant is 0.693 min–1 for first order reaction.

(D)  Half-life depends on initial concentration for first order reaction.

  1. A, B, C

 

  1. The dissociation of ammonium carbamate is represented by the following equation:

 

for the backward reaction is positive. The equation will shift from right to the left if there is

(A)  an increase in temperature

(B)  a decrease in pressure

(C)  an increase in concentration of ammonia

(D)  addition of inert gas at constant pressure into the reaction container

  1. A, C
  2. According to Le Chatelier’s principle.

 

 

 

42.

(A)  H at a is easy to remove                              (B)  H at b is easy to remove

(C)  H at a is difficult to remove                         (D)  H at b is difficult to remove

  1. B, C

 

  1. Which will show geometrical isomerism?
(A) CH3CH=NOH (B)  
(C) (D) HO-N=N-OH
  1. A, B, D

 

  1. For different values of Ka, Ostwald’s dilution law can be written as

            (A)                                              (B)

(C)                                                       (D)

  1. B, C

 

 

Match the Following Questions

 

  1. Match List–I and List–II.
List I List II
(A) Rate constant has the same unit as the rate of reaction. (i)    One
(B) Reactions having apparent molecularity more than three. (ii)   Zero order reaction
(C) Reactions having molecularity two but order of reaction is one. (iii)  Complex reaction
(D)        The syum For a reaction, A ® B, the rate of reaction doubles as the concentration of A is doubled. (iv)  Pseudo unimolecular reaction
  1. A (ii)

            B (iii)

            C (iv)

            D (i)

 

  1. Match List–I and List–II.
List I List II
(A) The limits of pH values of buffer solution. (i)
(B) The [H3O]+ concentration in 0.001 M Ba(OH)2 solution. (ii)   Equal
(C) The buffer capacity of a solution is maximum when conc. of salt to that acid is: (iii)  1st order reaction
(D) Hydrolysis of ethyl acetate in acidic solution. (iv)
  1. A (iv)

            B (i)

            C (ii)

            D (iii)

 

  1. Match List I with List II and choose the correct answer from the code

List – I                                                              List – II

            Electrolyte                                                        Solubility Product

            (A) Bi2S3                                                            (i)  4s3

(B)  CdS                                                           (ii) 27s4

(C)  Al(OH)3                                                       (iii)108s5

(D)  CaF2                                                           (iv) s2

  1. A (iii)

            B (iv)

            C (ii)

            D (i)

 

  1. Match list-I (reaction) with list-II (mode of migration involved) and select the correct answer from the combination shown.
         List – I         List – II
(A) Claisen rearrangement (i) C to O
(B) Pinacol–pinacolone rearrangement (ii) C to C
(C) Schmidt rearrangement (iii) C to N
(D) Baeyer–Villiger oxidation (iv) O to C
  1. A (iv)

            B (ii)

            C (iii)

            D (i)

 

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