Chemical formulae of compounds

Select whether the following statement is true or false:

The cation that is present in magnesium oxide is ${\mathrm{O}}^{2-}$

Write the symbol of '$\mathrm{X}$' in the chemical formula for magnesium oxide given:

$\mathrm{MgX}$

Select the anion that is present in magnesium oxide.

Write the chemical formula of magnesium oxide.

Select whether the following statement is true or false:

The cation that is present in silver chloride is ${\mathrm{Cl}}^{-}$.

Write the symbol of '$\mathrm{X}$' in the chemical formula for silver chloride given:

$\mathrm{AgX}$

Select the anion that is present in silver chloride. 

Write the chemical formula of silver chloride.

Write the numerical value of '$\mathrm{x}$' in the chemical formula for calcium carbonate given:

${\mathrm{CaCO}}_{\mathrm{x}}$

Select the anion that is present in calcium carbonate.

Write the chemical formula of calcium carbonate.

Write the numerical value of '$\mathrm{x}$' in the chemical formula for sodium sulphate given:

${\mathrm{Na}}_{\mathrm{x}}{\mathrm{SO}}_4$

Select the anion that is present in sodium sulphate.

Write the chemical formula of sodium sulphate.

Identify the cation and anion in potassium nitrate.

The chemical formula of potassium nitrate is ${\mathrm{KNO}}_3$ .

The chemical formula of potassium nitrate is _____ .

Write the chemical formula of potassium nitrate?

Identify the cation and anion present in the copper sulphate.

The chemical formula of copper sulphate is ${\mathrm{CuSO}}_4$.