Assertion :1 faraday is the charge that liberates 1 eq. of metal at cathode. Reason: Passsage of 1 faraday charge through aq. MgCl $_{2}$ liberates 12 g Mg at cathode.

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 C Assertion is correct but Reason is incorrect
1 faraday of electricity liberates 1 equivalent of electricity at cathode.
When aqueous magnesium chloride is electrolyzed, the discharge potential of hydrogen ions is lower than that of magnesium ions. hence, hydrogen is liberated at cathode in preference to magnesium ions.
Thus, Assertion is correct but Reason is incorrect.

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