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Assertion:In mercury cell, the cell pote...

Assertion:In mercury cell, the cell potential is approximately 1.35 V Which cell will measure standard electrode and remains constant during its life.
Reason : The overall reaction in mercury cell is represented as `Zn(Hg)+HgO_((s)) to ZnO_((s)) + Hg_((l))`

A

If both assertion and reason are true and reason is the correct explanation of assertion .

B

If both assertion and reason are true but reason is not the correct explanation of assertion .

C

If assertion is true but reason is false .

D

If both assertion and reason are false .

Text Solution

AI Generated Solution

The correct Answer is:
To solve the given question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that in a mercury cell, the cell potential is approximately 1.35 V, and it remains constant during its life. - **Analysis**: The mercury cell, also known as the zinc-mercury oxide cell, indeed has a standard cell potential of about 1.35 V. This potential is stable throughout the life of the cell because the reactants and products do not change in concentration significantly over time. ### Step 2: Understand the Reason The reason given is that the overall reaction in the mercury cell is represented as: \[ \text{Zn(Hg)} + \text{HgO}_{(s)} \rightarrow \text{ZnO}_{(s)} + \text{Hg}_{(l)} \] - **Analysis**: This reaction shows that zinc amalgam (Zn(Hg)) reacts with solid mercury oxide (HgO) to produce solid zinc oxide (ZnO) and liquid mercury (Hg). In this reaction, there are no ions in solution whose concentrations would change over time. Therefore, the potential of the cell remains constant. ### Step 3: Evaluate the Correctness of Assertion and Reason - Both the assertion and the reason are correct. The assertion is true because the cell potential is indeed approximately 1.35 V and remains constant. The reason is also true because the reaction does not involve ions that would change concentration, thus maintaining a constant potential. ### Conclusion Both the assertion and reason are correct, and the reason provided is the correct explanation for the assertion. ### Final Answer Both assertion and reason are true, and the reason is the correct explanation of the assertion. Therefore, the correct option is A. ---
To solve the given question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that in a mercury cell, the cell potential is approximately 1.35 V, and it remains constant during its life. - **Analysis**: The mercury cell, also known as the zinc-mercury oxide cell, indeed has a standard cell potential of about 1.35 V. This potential is stable throughout the life of the cell because the reactants and products do not change in concentration significantly over time. ### Step 2: Understand the Reason ...
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