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# 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

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CBSE TEST PAPER-04
CLASS - XII CHEMISTRY (Electrochemistry)
Topic: - Kohlrausch Law & Electrolysis
1. What do you understand by strong and weak electrolytes? 
2. State kohlrausch’s Law? 
3. How is Limiting molar conductivity related to
i) degree of ionization and   ii) dissociation constant 
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? 
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? 
6. State Faraday’s Laws of electrolysis? 
7. What is meant by Faraday’s constant? 
8. How many faradays are needed to reduce 3g mole of Cu
2+
to Cu metal? 
9. How many g of chlorine can be produced by the electrolysis of molten
NaCl with a current of 1 amp. for 15 min? 
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
? 
11. There are two possible reactions for cathode in the electrolysis of aqueous ZnCl 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? 
A
B
C
1/2
(m ol/L)
1/2
m
o
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