Assertion : In electrochemical cell, we cannot use KCI in the salt bridge if anodic or cathodic

                  compartment consists of Ag+ of Pb2+ ion.

Reason : Salt bridge is employed to maintain the electrical neutrality and to minimize the liquid-liquid

               junction potential.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  Electrochemical Series |
 63%
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What will be the quantity of iron deposited by ferrous and ferric ion by 1F (Fe = 56)

(1) 14g, 9.3 g                                          

(2) 28g, 18.6 g

(3) 56g, 37.2g                                         

(4) None of these

Subtopic:  Faraday’s Law of Electrolysis |
 84%
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(D)The reaction for the cell,

Zn | Zn2+ (1.0 M) || Cd2+ (1.0 M) | Cd is-

(A) Cd Cd2++ 2e-   

(B) Zn2+  Zn  2e-

(C) Cd + Zn2+ Cd2++ Zn 

(D) Zn + Cd2+ Cd + Zn2+

 

Subtopic:  Electrochemical Series |
 88%
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Specific conductance has the unit:

1. ohm-1 cm-1                           

2. ohm.cm

3. ohm cm-1                             

4. ohm-1.cm

Subtopic:  Conductance & Conductivity |
 79%
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What is the value of pKb (CH3COO- ) if λm0= 390 & λm = 7.8 for 0.04 of a  CH3COOH  at 25°C ?

(A) 9.3                                               

(B) 9.2

(C) 4.7                                               

(D) 4.8

Subtopic:  Conductance & Conductivity |
 63%
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At 25°C, the standard emf of cell having reactions involving two electron change is found to be 0.295 V. The equilibrium constant of the reaction is-

(A) 29.5 × 10-2

(B) 10 

(C) 1010  

(D) 29.5 × 1010

Subtopic:  Relation between Emf, G, Kc & pH |
 68%
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The number of faradays required to produce one mole of water from a hydrogen-oxygen fuel cell containing aqueous alkali as an electrolyte is-

1. 1                               

2. 3

3. 2                               

4. 4

Subtopic:  Faraday’s Law of Electrolysis |
 62%
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How much current is necessary to produce H2 gas at the rate of 1 cm3 per second under STP ?

(A) 4.305 amp                                           

(B) 17.22 amp

(C) 8.61 amp                                            

(D) 2.1525 amp.

Subtopic:  Faraday’s Law of Electrolysis |
 59%
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A current of 0.250 A is passed through 400 ml of a 2.0 M solution of NaCl for 35 minutes. What will be the pH of the solution after the current is turned off ?

(A) 12.98                            

(B) 12.13

(C) 10.48                            

(D) 9.24

Subtopic:  Faraday’s Law of Electrolysis |
 63%
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During discharge of a lead storage cell, the density of sulphuric acid in the cell-

1. Increases.                                     

2. Decreases.

3. Remains unchanged.                      

4. Initially increases but decreases subsequently.

Subtopic:  Electrolytic & Electrochemical Cell |
 65%
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