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(A) Highly electropositive metals (like $Mg$) form binary compounds (borides and silicides) with $B$ and $Si$.Hydrolysis of magnesium boride $(Mg_3B_2

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$B, Si$

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(A) Highly electropositive metals (like $Mg$) form binary compounds (borides and silicides) with $B$ and $Si$.Hydrolysis of magnesium boride $(Mg_3B_2)$ yields borane $(B_2H_6)$:$Mg_3B_2 + 6H_2O \rightarrow 3Mg(OH)_2 + B_2H_6$Hydrolysis of magnesium silicide $(Mg_2Si)$ yields silane $(SiH_4)$:$Mg_2Si + 4H_2O \rightarrow 2Mg(OH)_2 + SiH_4$Since the question specifies that $X$ yields borane and $Y$ yields silane,$X$ must be $B$ and $Y$ must be $Si$.

Two elements $X$ and $Y$ combine separately with a highly electropositive metal to form binary compounds,which upon hydrolysis yield borane and silane,respectively. What are $X$ and $Y$?

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