Kohlrausch Law & Electrolysis Test 04 - Electrochemistry (Class 12, CBSE) Class 12 Notes | EduRev

Class 12 : Kohlrausch Law & Electrolysis Test 04 - Electrochemistry (Class 12, CBSE) Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-04 
CLASS - XII CHEMISTRY (Electrochemistry) 
Topic: - Kohlrausch Law & Electrolysis 
1. What do you understand by strong and weak electrolytes? [1] 
2. State kohlrausch’s Law? [1] 
3. How is Limiting molar conductivity related to
i) degree of ionization and   ii) dissociation constant [2] 
4. In fig. (1), identify the nature
of electrolyte A& B. In which case
it is not possible to obtain value
of limiting molar conductance? [2] 
5. At 298 K , the molar conductivities at infinite dilution of NH 4Cl , NaOH and
NaCl are 129.8 , 217.4 and 108.9 scm2 mol
-1
 respectively .It molar conductivity
of 0.01M NH 4OH solution is 9.33 scm2 mol
-1
 ,calculate the degree of dissociation
of NH 4OH at this dilution? [2] 
6. State Faraday’s Laws of electrolysis? [2] 
7. What is meant by Faraday’s constant? [1] 
8. How many faradays are needed to reduce 3g mole of Cu
2+
 to Cu metal? [1] 
9. How many g of chlorine can be produced by the electrolysis of molten
NaCl with a current of 1 amp. for 15 min? [2] 
10. How many electrons flow when a current of 5 amps is passed through a
solution for 193 sec. Given f = 96500 C. N A=6.002 × 10
23
 mol
-1
? [2] 
11. There are two possible reactions for cathode in the electrolysis of aqueous ZnCl 2 :  [2]
Zn
2+
 (aq) + 2e
- 
? Zn(s)        E = -0.76v
2H 2O (l) + 2e
- 
 ? H 2 (g) + 2OH
- 
(aq)   E = - 0.83v
Which one will take place ? 
12. Silver is deposited on a metallic vessel by passing a current of 0.2 amps.
for 3 hrs. Calculate the weight of silver deposited.
(At mass of silver = 108 amu, F = 96500 C? [2] 
A
B
C
1/2
 (m ol/L)
1/2
m
o
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