Assertion (A):  Mercury cell does not give steady potential.
Reason (R):  In the cell reaction, ions are not involved in the solution.

1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

 

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The correct statement regarding dry cells among the following is:
 
a. It is also known as the Leclanche cell.
b. The electrolyte is a moist paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2 ).
c. The cathodic reaction is : MnO2 + NH4++ e-→ MnO(OH) + NH3

1.Only a and b are correct2.Only c is correct
3.Only b and c are correct4.All are correct 
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Match the items of Column I and Column II.

Column I

Column II

A. Lechlanche cell

B. Ni-Cd cell 

C. Fuel cell 

D. Mercury cell 

1. Cell reaction 2H2 +O2 —> 2H2O

2. Does not involve any ion in solution and is used in hearing aids.

3. Rechargeable

4, Reaction at anode, Zn ——> Zn2+ + 2e-

 

1)A-2,B-1,C-4,D-3

2)A-1,B-2,C-3,D-4

3)A-3,B-2,C-1,D-4

4)A-4,B-3,,C-1,D-2

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 Match the items of Column I and Column II.

Column I

Column II

A. Lead storage battery

B. Mercury cell

C. Fuel cell

D. Rusting

1. Maximum efficiency

2. Prevented by galvanisation

3. Gives steady potential

4. Pb is anode, PbO2 is cathode

Correct option is:

1) A-1,B-2,C-3,D-4

2) A-4,B-2,C-3,D-1

3) A-4,B-3,C-1,D-2

4) A-4,B-3,C-2,D-1

Subtopic:  Batteries & Salt Bridge |
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