Assertion :The metals - copper, silver and lead are electro refined but K, Na and Ca are not. Reason: As K,Na and Ca are more reactive so their reduction is not easy while Cu, Ag and Pb have more reduction potential than hydrogen ion.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
As $K, N a$ and $C a$ are more reactive so their reduction is not easy while $C u, A g$ and $P b$ have more reduction potential than hydrogen ion so they reduce first and they are electro refined.

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Assertion :The metals - copper, silver and lead are electro refined but K, Na and Ca are not. Reason: As K,Na and Ca are more reactive so their reduction is not easy while Cu, Ag and Pb have more reduction potential than hydrogen ion.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionAs K, Na and Ca are more reactive so their reduction is not easy while Cu, Ag and Pb have more reduction potential than hydrogen ion so they reduce first and they are electro refined.