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Assertion(A): Na^(o+) ions are discharge...

Assertion`(A): Na^(o+)` ions are discharged in preference to `H^(o+)` ions at `Hg` cathode.
Reason `(R) : ` The nature of the cathode can affect the order of discharge of ions.
(a)If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`.
(b)If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.
(c)If `(A)` is correct, but `(R)` is incorrect.
(d) If `(A)` is incorrect, `(R)` is correct.

A

If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`.

B

If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`.

C

If `(A)` is correct, but `(R)` is incorrect.

D

If `(A)` is incorrect, `(R)` is correct.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: - The assertion states that sodium ions (Na⁺) are discharged in preference to hydrogen ions (H⁺) at a mercury cathode. - This is true because sodium ions have a higher reduction potential compared to hydrogen ions when using a mercury cathode. Therefore, Na⁺ ions will gain electrons and get reduced to sodium metal before H⁺ ions can be reduced to hydrogen gas. 2. **Understanding the Reason (R)**: - The reason states that the nature of the cathode can affect the order of discharge of ions. - This statement is also true. The type of electrode (cathode) used in an electrochemical cell influences which ions are discharged preferentially. For example, at a platinum cathode, H⁺ ions are discharged preferentially over Na⁺ ions. 3. **Evaluating the Relationship between (A) and (R)**: - Since both the assertion and the reason are correct, we need to determine if the reason correctly explains the assertion. - The assertion is about the specific case of Na⁺ being discharged over H⁺ at a mercury cathode, while the reason talks about how the nature of the cathode affects ion discharge in general. - Therefore, while the reason is true, it does not specifically explain why Na⁺ is discharged over H⁺ at the mercury cathode. 4. **Conclusion**: - Both (A) and (R) are correct, but (R) is not the correct explanation of (A). - Hence, the correct option is (b). ### Final Answer: (b) If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
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