Define the empirical and molecular formula of a compound.

A metal $\mathrm{M}$ forms a carbonate having the formula ${\mathrm{M}}_2{\left({\mathrm{CO}}_3\right)}_3$. What is the valency of $\mathrm{M}$?

A metal $\mathrm{M}$ forms a carbonate having the formula ${\mathrm{M}}_2{\left({\mathrm{CO}}_3\right)}_3$.

What will be the formula of fluoride of $\mathrm{M}$?

What information does the following chemical equation convey:

$\mathrm{Zn}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{ZnSO}}_4+{\mathrm{H}}_2$

What information does the following chemical equation convey:

$\mathrm{Mg}+2\mathrm{HCI}\to {\mathrm{MgCI}}_2+{\mathrm{H}}_2$

What is the valency of:

Fluorine in ${\mathrm{CaF}}_2$.