Electrochemistry Class 12 Chemistry Chapter 03 Short Questions with Answers

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1.Out of Cu, Ag, Zn and Mg the metal which can displace all others from their aqueous salt solution is
(b)Zn
(a)Cu
(c)Ag
(d)Mg

2. Which of the following solutions can be stored in
   copper vessel ?
   (a) AgNO³
   (b) AuCl³
   (c) ZnCl²
   (d) all of these

3.The charge carried by one mole electron is
(a) 1.6×10 “coulomb (b) 6.28x 10 coulomb
(c) 9.65x 10′ coulomb (d) 6.023* 102 coulom

4.In electroplating the article to be electroplated is made as
(b) anode
(a) Cathode
(c) either cathode or anode
d) simply suspended in the electrolytic solution

5.The following reaction takes place in a lead store a battery during discharging.
Pb +PbO, +4H + SO->2PbSO, +2H²0 reaction. It is a case of
(b) disproportionation
(a) redox
(c) comproportionation
(d) metathetical

6. What amount of electricity is require to deposite the I mole copper from a solution of CuSo⁴?
   (b) 1F
   (a) 2F
   (d) 0.5F
   (c) 3F

7.The limiting molar conductance of NaCl, KBr, KC are 126, 152 and 150 ohm cm mole respectively
The limiting molar conductance of NaBr is
(b)302
(a) 128
(d) 176
(c) 428

8.The correct order of equivalent conductance at infinite dilution of LICI, NaCl, KCI is
(a) LiCl> NaCl > KCI
(b) LiCl < NaCl< KCI (c) NaCl> KCI> LiCI
(d) KCI< NaCl < LiCl

9. When a rod of metal ‘A’ is dipped in aqueous solution of metal ‘B at 25°C, what will happen (Given standard electrode potentials are A/A = – 0.76 V and B2/B = +0.34V)

(a) ‘A will gradually dissolve
(6) B will depositon ‘A
(c) Water will decompose
(d) No reaction will occur

10 10. The best conductor of electricity is a IM solution of
(a) Boric acid
(b) acetic acid
(C) Oxalic acid
(d) sulphuric acid

11. If’V’, in the equation, 2, =K x Vis the volume ” cc containing I gm equivalent of the electroly
    V for ang solution will be
    (a) 10 cc
    c) 1000 cc
    (b) 100 cc
    (d) 10,000 cc
    
12. . Electrolytes conduct electricity due todue to movement of
    (b) ions
    (a) atoms
    (d) molecules
    (c) elcoctrons
13. The mass of a subsance liberated at the electrode is directly proportional to its
    (b) equivalent mass
    (a) atomic mass
    (c) molecular mass
    (d) none of these
14. The unit of electrochemical equivalent is
    (a) gm/coulomb
    (b) gm/ampere
    (d) gm.coulomb
    (c) coulomb/gm

15.The correct relationship between free energy change
and cell potential is
(a)∆G°=-nFE°
(b) ∆G = nFE°
(c)-∆G°=-(nF/E⁰)
(d)∆G° =nE⁰/f

16. A current of 0.75A is passed through an acidic CuSO⁴ solution for 10 min. The volume of oxygen
    liberated at anode at NTP will be
    (a) 0.261cc
    (b) 26.1 cc
    (c) 52.2cc
    (d) 0.522 cc
17. The electrolysis of hydrochloric acid results in the formation of 1 gm equivalent of H, gas at the
    cathode. The weight of Cl, liberated at anode is
    (a) 1 gm
    (b) 17.75 gm
    (c) 35.5 gm
    (d) 71 gm
18. The exact value of emf of a cell can be measured
    by means of
    (a)potentiometer
    (b) Galvanometer
    (c) polarimeter
    (d)ammeter
19. When one coulomb of electricity is passed through an electrolytic solution, the mass deposited is equal
    to
    (a) the chemical equivalent
    (b) the atomic weight
    (c) the electrochemical equivalent
    (d) the molecular weight
20. The standard reduction potential for the reaction, Cu +2e—-> Cu is +0.34V. The standard electrode potential for the reaction, 2Cu2 + 4e —>2Cu will be
    (a) 0.34V
    (b) 0.51V
    (c) 0.68V
    (d) unpredictable
    
21. At infinite dilution on the equivalent conductance of
    CH³ COONa, HCI and NaCl are 91, 426 and 126.7 ohm–1 cm²gm eq–¹ respectively The equivalent conductance of
    of CH³ COOH at infinite dilution is nearly cqual to
    (b) 209
    (a) 126
    (d) 908
    (c) 390.3
22. The electrolytic ducts of aqueous solution of NaOH are
    (b) Na; O,
    (a) Na; F,
    (d) H F,
    (c) HO
23. For a redox reaction to be spontanious, the e.m.f should be
    (b) +ve
    (a) -ve
    (d) any one these
    (C) zero
24. When same quantity or current is passed through two different electrolytes connected in series, the amount of products liberated at the electrodes are in the ratio of their.
    (b) equivalent mass
    (a) atomic mass
    (c) molecular mass
    (d) atomic number
25. During electrolysis the reaction occurs at anode is
    (b) oxidation
    (a) reduction
    (d) hydrolysis
    (c) redox
26. The number of faradays required to deposit 27 gm
    Al from a solution of AICl, will be
    (b) 2
    (a) 1
    (d) 4
    (c) 3
27. If same quantity of electricity is passed through
    aqueous solution of AICl, AI(NO,), and Al,(SO,
    the ratio of weights of ‘Al’ deposited at the cathode
    from the above solutions is
    (a) 1:1:2
    (b) 1:1:1
    (c) 1:2:3
    (d) 3:2:1
28. Which of the following equations is correct?
    (a) conductance = specific conductance x cell constant
    (b) Equivalent conductance= specific Conductance × cell constant
    (c) Conductance= Equivalent conductance × Cell constant
    (d) Cell constant = specific conductance
29. Which of the following solutions of NaCl has conductance the lowest value of specific conductance
    (a) 1M
    (b) 0.1M
    (c) 0.01 M
    (d) 0.001M
30. 3.17 gm of a substance was deposited by the flow of 0.1 mole of electrons. The equivalent wieght of
    the substance is
    (b) 3.17
    (a) 0.317
    (d) 63.4
    (c) 31.7

31.When electricity is passed through a solution of AIC1, 13.5 gm of Al’ metal is deposited. The number of faraday must be
(b) 1.5
(a) 1
(d) 3
(c)2

32. The passage of current through the solution of a certain clectro lyte results in the liberation of H, at the cathode and Cl, gas at anode. The solution in the container could not be
    (b) KCI (ag)
    (a) NaCl (ag)
    (d) MgCL²(aq)
    (C)Cucl²(aq)
33. The increase in molar conductance of HOCl with
    dilution is due to
    (a) increase in degree of dissociation of HCI
    (b) increase in degree of dissociation of water.
    (c) increase in ionic mobility
    (d) increase in interionic force of attraction.
34. Which of the following statements is wrong?
    (a) Nat has different molar conductance at infinitedilution in NaCl and NaBr
    (b) degree of dissociation (€) ¥©\¥°
    (c) Kohlraush law is used to find o value for weak electrolytes
    (d) H(H,SO,) = 2. (H)+ p. SO,)
35. Which of the following statement is true about
    Zn-CuSO⁴ cell ?
    (a) electron flows from Cu to Zn-electrode
    (b) Standred reduction potential of ‘Zn’ is more than ‘Cu’
    (c) Zn’ is anode and ‘Cu’ is cathode
    (d) all the statements are correct.
36. The cell reaction, Zn+2Age Znan+2 Ag can
    (aq) be represented by
    (a) Ag/Ag||Zn²±(aq)/Zn
    (b) 2AgoAg| Zn/Zn 2±(aq)
    (C) Zn/Zn²+|| l 2Ag±(aq)/Ag
    (d) Zn/Zn²±|| Ag± (aq)/ Ag
37. The electrode potential of normal of normal hydrogen electrode is
    (b) 1 volt
    (a) 0 volt
    (d) 0.1 volt
    (c)10 volt
38. When an electric rent is passed through acidulated water, 112 ml of H, gas is collect Oug a NTP at cathode in 965 sec. The Current strength i
    (b) 0.5 amp
    (a) 1 amnp
    (d) 2 amp
    (c) 0.1 amp
39. Which of the following does not change the V
    value of electrode potential 1?
    (a) concentration of the solution
    (b) temperature
    (c) pressure of the gaseous substance
    (d) stochiometry of half cell reaction
40. Which will be decomposed when electric current
    is passed through its aqueous solution ?
    (b)urea
    (a) glucose
    (c) common salt
    (d) benzene
41. The degree of dissociation of CH,COOH Sol”. can
    be increased by
    (a) adding more CH,COOH to the solution
    (b) adding more water to the solution
    (c) decreasing temperature of the solution
    (d) Stirring the solution vigorously
42. The unit of equivalent conductance is
    (a) Ohm
    (b) Ohm-¹cm² gm eq–¹
    (c) Ohm–¹ cm–2
    (d) Ohm cm–2gm. eq–¹
43. In a galvanic cell
    (a) electrons move from anode to cathode
    (6) electrons move from cathode to anode
    (c) electrons move through the salt brige
    (d) oxidation occurs at cathode
44. Which of the following will increase the cell potential of the cell ?
    Zn +Cu(aq—> Zn2± (aq) +Cu

(a) increasing the size of ‘Zn’ rod
(b) increasing Zn? ion concentration
(C) increasing the size of ‘Cu’ rod
(d) increasing Cu2± ion conc.

45. By electrolysing a solution of dilute H²SO⁴ in presence of platinum electrodes the gas evolved at anode is
    (a) SO
    (c) 0,
    (b) SO
    (d) H

ANSWER

1.(d) 2.(c) 3. (c) 4. (a) 5. (c)6.(b) 7. (a) 8. (b) 9. (a) 10. (d) 11. (d) 12. (b) 13. (b) 14.(a) 15. (a)16. (b) 17. (c) 18. (a) 19. (c) 20. (a)21. (c) 22. (c) 23. (b) 24 b) 25. (b)26. (c) 27. (b) 28. (d) 29. (d) 30. (c)31. (b) 32. (c) 33. (c) 34. (a) 35. (c)36. (d) 37. (a) 38. (a) 39. (d) 40. (c) 41 (b) 42. (b) 43. (a) 44. (d) 45. (c)