Electrochemistry

In the electrolysis of aqueous solution of NaOH, 2.8 litre of oxygen was liberated at the anode at NTP. How much hydrogen was liberated at the cathode ?

Q: In the electrolysis of aqueous solution of NaOH, 2.8 litre of oxygen was liberated at the anode at NTP. How much hydrogen was liberated at the cathode?

(A) 5.6 litre

(B) 56 ml

(C) 560 ml

(D) 0.056 litre

Ans: (A)

The cost at 5 paise/KWH of operating an electric motor for 8 hours which takes 15 amp at 110 V is

Q: The cost at 5 paise/KWH of operating an electric motor for 8 hours which takes 15 amp at 110 V is

(A) Rs.66

(B) 66 Paise

(C) 37 Paise

(D) Rs.6.60

Ans: (B)

The charge required for the oxidation of one mole Mn3O4 into in presence of alkaline medium is

Q: The charge required for the oxidation of one mole Mn3O4 into in presence of alkaline medium is

(A) 5 x 96500 C

(B) 96500 C

(C) 10 x 96500 C

(D) 2 x 96500 C

Ans: (C)

Passage of one ampere current through 0.1M Ni(NO3)2 solution using Ni electrodes brings in the concentration of solution to ……… in 60 seconds.

Q: Passage of one ampere current through 0.1M Ni(NO3)2 solution using Ni electrodes brings in the concentration of solution to ……… in 60 seconds.

(A) 0.1 M

(B) 0.05 M

(C) 0.2 M

(D) 0.025 M

Ans: (A)

How much will the reduction potential of a hydrogen electrode change when its solution initially at pH = 0 is neutralized to pH = 7 ?

Q: How much will the reduction potential of a hydrogen electrode change when its solution initially at pH = 0 is neutralized to pH = 7?

(A) Increase by 0.059V

(B) Decrease by 0.059V

(C) Increase by 0.41V

(D) Decrease by 0.41V

Ans : (D)