Ncert Exercises & Solutions

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.

Hint: Mercury cell gives steady potential.

Explanation:

The overall reaction is represented by: \(Zn(Hg)\ + HgO(s)\ \rightarrow\ ZnO(s)\ + Hg(l)\)

Mercury cell gives steady potential. The cell potential remains constant during its life as the overall reaction involves solid reactants and products (zinc and mercury oxide) and does not involve ions in solution. This means the concentration of any ions doesn't change over time, which is crucial for maintaining a steady potential.

Hence, the assertion is false but the reason is true. Option 4 is the correct answer.

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions