Assertion :Among the alkali metals, lithium salts exhibit the least electrical conductance in aqueous solutions. Reason: Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

Read the above assertion and reason and choose the correct option regarding it.

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
Larger the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.
The effective radius of Lithium ion in water is highest (as it is extensively hydrated).
Hence, among the alkali metals, lithium salts exhibit the least electrical conductance in aqueous solutions.
Thus, Assertion is correct but Reason is incorrect.

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