Distinguish by a chemical test.
Sulphuric acid from nitric acid and hydrochloric acid.

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper $\left(\mathrm{II}\right)$ sulphate, zinc nitrate, lead nitrate, calcium chloride and iron $\left(\mathrm{III}\right)$ sulphate. Copy the following table and write the colour of the precipitate in $\left(\mathrm{a}\right)$ to $\left(\mathrm{e}\right)$ and the nature of the precipitate (soluble or insoluble) in $\left(\mathrm{f}\right)$ to $\left(\mathrm{j}\right)$.

Mention the colour changes observed when the following indicators are added.

Salts $\mathrm{A}$ undergoes reaction $\left(\mathrm{a}\right)$. Identify the anion present in this salt on the basis of this reaction.

When silver nitrate solution is added to a solution of $\mathrm{A}$, a white precipitate, insoluble in dilute nitric acid, is formed.

Salt $\mathrm{B}$ undergoes reaction $\left(\mathrm{b}\right)$. Identify the anion present in this salt on the basis of this reaction.

The addition of dilute hydrochloric acid to $\mathrm{B}$ produces a gas which turns lead acetate paper black.