Assertion :Statement -I : ${B e C l}_{2}$ fumes in moist air.
Reason: Statement -II : ${B e C l}_{2}$ reacts with moisture to form $H C l$ gas.

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
Beryllium chloride is stable in dry air, but absorbs moisture forming its tetrahydrate, $B e C l_{2} .4 H_{2} O$ . It readily dissolves in water undergoing hydrolysis and evolving hydrochloric acid:
$B e C l_{2} + 2 H_{2} O \to B e (O H)_{2} + 2 H C l$
So both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hence option A is correct.

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Assertion :Statement -I : BeCl2 fumes in moist air. Reason: Statement -II : BeCl2 reacts with moisture to form HCl gas.

Assertion :Statement -I : ${B e C l}_{2}$ fumes in moist air.
Reason: Statement -II : ${B e C l}_{2}$ reacts with moisture to form $H C l$ gas.