Assertion :The mobility of sodium ion is lower than that of potassium ion. Reason: The ionic mobilities depend on the effective radius of the 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
${N a}^{+}$ ion is smaller in size. It gets more hydrated than $K^{+}$ ion. Therefore, mobility of ${N a}^{+}$ ion is lower than that of $K^{+}$ .
Reason is correct explanation for assertion.

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Assertion :The mobility of sodium ion is lower than that of potassium ion. Reason: The ionic mobilities depend on the effective radius of the ion.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionNa+ ion is smaller in size. It gets more hydrated than K+ ion. Therefore, mobility of Na+ ion is lower than that of K+.Reason is correct explanation for assertion.