1.

Assertion. [Al(H_(2)O)_(6)]^(3+) is a stronger acid than [Mg(H_(2)O)_(6)]^(2+). Reason : Size of [Al(H_(2)O)_(6)]^(3+) is smaller than [Mg(H_(2)O)_(6)]^(2+) and possesses more effective nuclear charge.

Answer»

If both ASSERTION and reason are TRUE, but reason is not the true explanation of the assertion
If both assertion and reason are true, but reason is not the true explanation of the assertion
If assertionis true, but reason is false
If both assertion and reason are false

Solution :R is the CORRECT explanation of A. This is because `[Al(H_(2)O)_(6)]^(3+)` has greater effective nuclear charge than `[Mg(H_(2)O)_(6)]^(2+)` and thus attracts electron pairs from donor groups more effectively. This also makes it relatively more acidic.


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