Assertion :Sodium ions are discharged at a mercury cathode in preference to hydrogen ion. Reason: $N a^{+}$ is stronger reducing agent than $H^{+}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
since, the sodium metal is having lower reduction potential ( $E_{c e l l}^{0}$ = -2.71$), so it will act as a stronger reducing agent and discharge of sodium ions takes place at mercury electrode.

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Assertion :Sodium ions are discharged at a mercury cathode in preference to hydrogen ion. Reason: Na+ is stronger reducing agent than H+.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertionsince, the sodium metal is having lower reduction potential (E0cell = -2.71$), so it will act as a stronger reducing agent and discharge of sodium ions takes place at mercury electrode.

Assertion :Sodium ions are discharged at a mercury cathode in preference to hydrogen ion. Reason: $N a^{+}$ is stronger reducing agent than $H^{+}$ .