Question

Two elements $X$ and $Y$ react separately with highly electropositive metal to form binary compounds, which upon hydrolysis yield a mixture of boranes and silanes. $X$ and $Y$ are _________ respectively

• A. $B,Si$
• B. $Si,B$
• C. $Al,B$
• D. $B,Al$

Answer 1

The correct option is A $B,Si$

1. $3M+2B\to M_3{B}_2$, $2M+Si\to M_{2}Si$
2. $M_3{B}_2+6HCl\to 3MC{l}_2+B_2{H}_6$, $M_{2}Si+4HCl\to 2MC{l}_2+Si{H}_4$

Thus boron and silicon reacts with metals M to form boranes and silanes.