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Assertion (Statement-1): Of all the alkali metal cations in aqueous solution, Li+(aq) shows the highest molar conductivity. Reason (Statement-2): Li+(aq) is the largest alkali metal cation in solution due to its high degree of hydration.

1. Statement-1 is true, Statement-2 is true, and Statement-2 correctly explains Statement-1.
2. Statement-1 is true, Statement-2 is true, but Statement-2 does NOT correctly explain Statement-1.
3. Statement-1 is true, Statement-2 is false.
4. Statement-1 is false, Statement-2 is true.

Correct answer: Statement-1 is false, Statement-2 is true.

Solution

Li+ has the smallest bare radius and the highest charge density, so it is the most heavily hydrated alkali cation, giving it the largest hydrated radius and therefore the LOWEST (not highest) molar conductivity. Statement-1 is false; Statement-2 is true.

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