Assertion :Both boron and silicon form binary compounds with several metals to give borides and silicide. Reason: These borides and silicide react with $H_{3} P O_{4}$ to give mixture of boranes and silanes.

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
Many metals on reaction with Boron or Silicon form Borides and Silicides Eg: $3 M g + 2 B ⟶ {M g}_{3} B_{2}$
Borides and silicides on reaction with $H_{3} P O_{4}$ give boranes and silanes. Eg: $2 {M g}_{3} B_{2} + 4 H_{3} P O_{4} ⟶ B_{4} H_{10} + 2 {M g}_{3} {(P O_{4})}_{2} + H_{2}$
Thus both statements are correct but Reason does not explain Assertion.

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Assertion :Both boron and silicon form binary compounds with several metals to give borides and silicide. Reason: These borides and silicide react with H3PO4 to give mixture of boranes and silanes.

Assertion :Both boron and silicon form binary compounds with several metals to give borides and silicide. Reason: These borides and silicide react with $H_{3} P O_{4}$ to give mixture of boranes and silanes.