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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 $Si$.

List-$I$ (Compounds)	List-$II$ (Uses)
$A$. Boron-$10$	$I$. Antiseptic
$B$. Borax	$II$. Bullet proof vest
$C$. Boron-fibre	$III$. Neutron absorber
$D$. Orthoboric acid	$IV$. Heat resistance glasses

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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Match the following compounds in List-$I$ with their uses in List-$II$:
List-$I$ (Compounds) List-$II$ (Uses)
$A$. Boron-$10$ $I$. Antiseptic
$B$. Borax $II$. Bullet proof vest
$C$. Boron-fibre $III$. Neutron absorber
$D$. Orthoboric acid $IV$. Heat resistance glasses

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