CBSE Class 12 Chemistry Electrochemistry
CBSE Class 12 Chemistry Electrochemistry
CBSE Class 12 Chemistry Electrochemistry
com
CLASS XII
CHAPTER- ELECTROCHEMISTRY
2. The E values of Cu and Zn are 0.34V and –0.76V respectively. Which of the two is a stronger
reducing agent?
1. Define and express the relationship between conductivity and molar conductivity for the
solution of an electrolyte. (2011)
2. Electrolytic specific conductance of 0.25M solution of KCl at 250C is 2.56 x 10-2S/cm,
calculate the molar conductance.
3. Describe the reactions which occur at the electrodes in a fuel cell that causes H2 and O2 to
produce electricity.
4. How many hours does it take to reduce 3 moles of Fe3+ to Fe2+ with a current of 2amps?
5. Account for the following:
a) Alkaline medium inhibits the rusting of iron.
b) Iron does not rust even if the zinc coating is broken in a galvanized iron pipe.
6. Calculate the time to deposit 1.5 g of silver at cathode when a current of 1.5 A was passed
through the solution of AgNO3. (Molar mass of Ag = 108 g mol-1, 1 F = 96500 C mol-1)
(2015)
1. a) State Kohlrausch law of independent migration of ions. Write an expression for the
molar conductivity of acetic acid at infinite dilution according to Kohlrausch law.
b) Calculate λ0m for acetic acid.
Given that λ0m (HCl) = 426 Scm2mol-1 and
λ0m (CH3COONa) = 91 Scm2mol-1 (2010)
1. Ram lives at the second floor. He is painting the iron stair ways of his house to preventing it from
corrosion.
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