TOPIC – ELECTROCHEMISTRY 

CLASS – XII


● Electrolysis of dilute H2SO4 liberates gases at anode and cathode respectively

ANS :- O2 and H2O 

● The value of equilibrium constant for the feasible cell reaction is

ANS :- >1

● At 25 ⁰C, E⁰ for the cell reaction : Cu²+ + Sn[s] ----> Cu[s] + Sn²+ is 0.48 V. The equilibrium constant for the reaction is

ANS : - 1.8 × 10¹⁶

● By how much will the potential of copper electrode change if the solution of CaSO4 in which it is immersed is diluted 10 times at 298 K

ANS : - decreases by 29.5 mV

● During the electrolysis of a solution of dilute H2SO4 by using platinum electrodes, the gas evolved at the anode is

ANS : - O2

● 10800 C of electricity through the electrolyte deposited 2.977 g of metal with atomic mass 106.4 a.m.u. The valency of metal cation is

ANS : - 4

● Four alkali metal A, B, C and D are having respectively standard electrode potentials as -3.05 , -1.66 , -0.40 and 0.80 V. Which will be the most reducing ?

ANS : - A

● The standard reduction potential values of three metalic cations X, Y and Z are 0.52, -3.03 and -1.18 respectively. The order of reducing power of the corresponding metals is

ANS : - Y >Z > X

● When lead storage battery discharges

ANS : - H2SO4 is consumed

● Galvanized iron sheets are coated with

ANS : - Zn