${\mathrm{Cl}}^{-}, {\mathrm{F}}^{-}, {{\mathrm{CO}}_3}^{-2}$ and ${{\mathrm{SO}}_4}^{2-}$ are  radicals. (acidic / basic)

Write the valency of fluorine in ${\mathrm{CaF}}_2$.

An element 'X' has a valency 1. Write the chemical formula of its phosphide.

Write the formulae and then balance the following chemical equation.
Lime water+Carbon dioxide$\to$Calcium carbonate+Water

Write the formulae and then balance the following chemical equation.
Magnesium+Silver nitrate$\to$Magnesium nitrate +Silver

Write the formulae and then balance the following chemical equations.

Butane+Oxygen$\to$Carbon dioxide+Water

Write the formulae and then balance the following chemical equations.

Sodium hydroxide+Sulphuric acid$\to$Sodium sulphate+Water