Question

Identify $\left(E\right)$ :
(a)$Si\underset{conc,\Delta }{\overset{HN{O}_3/HF}{\to }}\underset{\underset{\left(B\right)+\left(C\right)}{\downarrow }}{\left(A\right)}\stackrel{HF}{\to }\left(B\right)$
(b)Graphite$\stackrel{hotconcHN{O}_3}{\to }\left(D\right)$
(c)$\underset{fused}{N{a}_{2}C{O}_3}+Si\to \left(E\right)$

• A. $\left(E\right):(N{a}_{2}C{O}_2+SiO)$
• B. $\left(E\right):(N{a}_{2}CO+Si{O}_2)$
• C. $\left(E\right):(N{a}_{2}Si{O}_3+C)$
• D. None of these

Answer 1

The correct option is C $\left(E\right):(N{a}_{2}Si{O}_3+C)$

The complete reactions are given below:

(a) $Si\underset{conc,\Delta }{\overset{HN{O}_3/HF}{\to }}\underset{\underset{\left(H_{2}Si{F}_6\right)+\left(H_{4}Si{O}_4\right)}{\downarrow H_{2}O}}{\left(Si{F}_4\right)}\stackrel{HF}{\to }\left(H_{2}Si{F}_6\right)$

$3Si{F}_4+4H_{2}O\to H_{4}Si{O}_4+2H_{2}Si{F}_6$

(b) $\text{Graphite}$ $\stackrel{hotconc.HN{O}_3}{\to }\left(C_6\right(COOH{)}_6)$

(c) $\underset{fused}{N{a}_{2}C{O}_3}+Si\to (N{a}_{2}Si{O}_3+C)$