Assertion :Acidic character of group 16 hydrides increases from $H_{2} O$ to $H_{2} T e$ . Reason: Thermal stability of hydrides decreases down the group.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Thermal stability of hydrides decreases down the group in Group $V I$ due to increase in size . But acidic character increases down the group as the $M - H$ bond strength decreases. Thermal stability and acidity are not related.

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