Electrochemistry  MCQs

MCQs of Electrochemistry

Showing 31 to 40 out of 158 Questions
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31.
Fe → Fe2+ + 2e-, E°= +0.440 V

Ni → Ni2+ + 2e-, E°= +0.23 V

Cu → Cu2+ + 2e-, E°= -0.345 V

Ag → Ag+ + e-, E°= -0.80 V Which metal will reduced quickly ?

(a) Fe
(b) Ni
(c) Cu
(d) Ag
Answer:

Option (d)

32.
What is the pOH of 0.01M HCl solution ?
(a) 2
(b) 12
(c) 1 × 10-2
(d) 1 × 10-12
Answer:

Option (b)

33.
By combining which of the following two half cell, maximum cell potential will obtained ?

(1) A + e- → A-      ; E°= -0.24 V

(2) B- + e- → B-2    ;  E°= 1.25 V

(3) C- + 2e- → C-3  ; E°= -1.25 V

(4) D- + 2e- → D-2   ;  E°= 0.68 V

(a) 2 and 3
(b) 2 and 4
(c) 1 and 3
(d) 1 and 4
Answer:

Option (a)

34.
Which of the following is weak electrolyte ?
(a) NaCl
(b) HCl
(c) CH3COOH
(d) K2SO4
Answer:

Option (c)

35.
In the Nernst's equation E=E0-RTnFlnQ of the following condition Kc=Q ?
(a) E=E0
(b) E0=1
(c) RTnF=1
(d) E = 0
Answer:

Option (d)

36.
How much electricity required to get 1 mole 'Al' from AlCl3 solution ?
(a) 3F
(b) 2F
(c) 1F
(d) 3A (ampere)
Answer:

Option (a)

37.
Specific conductivity of 0.01 M solution is 1.061 × 10-4 what will be its molecular conductivity ?
(a) 1.061 × 10-4
(b) 10.61
(c) 106.1
(d) 1.061
Answer:

Option (b)

38.
What will be the result of increase in the concentration of Fe2+ in the following cell reaction ? 2Fe3+ + Zn → Zn2+ + 2Fe2+
(a) Cell potential increase
(b) Cell potential decrease
(c) pH of solution decrease
(d) None of these
Answer:

Option (b)

39.
Value of λCH3COONa = 224 ohm-1 cm2 gm equ.-1, λNaCl = 38.2 ohm-1 cm2 gm equ.-1 and λHCl = 203 ohm-1 cm2 gm equ.-1. Now find the value of λCH3COOH.
(a) 288.5 Ω-1cm2 gm eq-1
(b) 289.5 Ω-1cm2 gm eq-1
(c) 388.5 Ω-1cm2 gm eq-1
(d) 389.5 Ω-1cm2 gm eq-1
Answer:

Option (c)

40.
What is the potential of hydrogen electrode, if the pH of electrolyte is 10.
(a) 0.59V
(b) 0.00V
(c) -0.59V
(d) -0.059V
Answer:

Option (c)

Showing 31 to 40 out of 158 Questions
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