$3{\mathrm{O}}_2$ contains six atoms of oxygen.

Identify whether the statement is true or false and rewrite the correct statement if it is false.

One molecule of calcium oxide contains three atoms.

Identify whether the statement is true or false and rewrite the correct statement if it is false.

In ${\mathrm{Fe}}_2{\mathrm{O}}_3$, the combining capacity of iron is $2$ and that of oxygen is $3$.

Correct the statement.

Symbol of copper is $\mathrm{Co}$.

Correct the statement.

Silicon is a liquid.

Correct the statement.

The German name of tin is stannum.

Correct the statement.

Blue vitriol is ${\mathrm{CuSO}}_4. 6{\mathrm{H}}_2\mathrm{O}$

Correct the statement.

Formula of magnesium sulphide is ${\mathrm{Mg}}_2\mathrm{S}$.