One molecule of a binary acid contains two hydrogen atoms and a negative radical X. What will be the formula of the salts when it reacts with bases, like, $\mathrm{M}\left(\mathrm{OH}\right), \mathrm{M}(\mathrm{OH}{)}_2$ and $\mathrm{M}(\mathrm{OH}{)}_3$? Explain with reasons.

The formula of hydrogen phosphate of a metal $\mathrm{M}$ is ${\mathrm{MHPO}}_4$. Give the formula of its chloride.

The formula of hydrogen phosphate of a metal $\mathrm{M}$ is ${\mathrm{MHPO}}_4$. Give the formula of its sulphite.

Write the balanced chemical equation for the following: Potassium bromide on treatment with manganese dioxide and sulphuric acid gives manganese and potassium sulphates, bromine and water.

Write the balanced chemical equation for the following: In the preparation of phosphate fertilisers, calcium phosphate in phosphate rock is converted into phosphoric acid and calcium sulphate.

Write the balanced chemical equation for the following: Sodium nitrite is produced by the reaction of the oxides of nitrogen in which nitrogen shows valency 2 and 4 in a solution of sodium carbonate.

Nitrogen and oxygen react to produce nitric oxide. What is the weight of oxygen required to convert $4.9 \mathrm{g}$ of nitrogen to nitric oxide?

Calculate amount of potassium chlorate required to give $120 \mathrm{g}$ of oxygen. What kind of chemical reaction takes place in the above process?