The most abundant metalloid present on the earth is . (Boron/ Silicon)

Complete the following reactions.

$\mathrm{C}+{\mathrm{O}}_2\to$

Complete the following equations.

$\mathrm{Na}+{\mathrm{O}}_2\to$

Complete the following equations.

$\mathrm{Mg}+{\mathrm{H}}_2\mathrm{O}\to$

Complete the following equations.

$\mathrm{Fe}+\mathrm{HCl}\to$

Complete the following equations.

$\mathrm{Ca}+{\mathrm{H}}_2{\mathrm{SO}}_4\to$