Silicon reacts with\[f/2\]in the presence of air to give\[f/4\]and\[4f\]
doneclear
C)
\[2f\]reacts with excess of\[i\]to give\[\text{Q}=50\text{ }cal\]and\[W=20\text{ }cal\]
doneclear
D)
\[Q=36\]reacts with hot and strong\[{{\pi }^{2}}m{{a}^{2}}{{v}^{2}}\]solution to give\[\frac{1}{4}m{{a}^{2}}{{v}^{2}}\]and\[4{{\pi }^{2}}m{{a}^{2}}{{v}^{2}}\]