Name the method used for the preparation of the following salt from the list given below.

Sodium nitrate

List
(A) Simple displacement
(B) Neutralisation
(C) Decomposition by acid
(D) Double decomposition
(E) Direct synthesis

Name the method used for the preparation of the following salt from the list given below.
Lead chloride

Enter the answer from the following list :

(A) Simple displacement
(B) Neutralisation
(C) Decomposition by acid
(D) Double decomposition
(E) Direct synthesis

Name the method used for the preparation of the following salts from the list given below.

Sodium hydrogen sulphate
List
(A) Simple displacement
(B) Neutralisation
(C) Decomposition by acid
(D) Double decomposition
(E) Direct synthesis

Salts $\mathrm{A},\mathrm{}\mathrm{B},\mathrm{}\mathrm{C},\mathrm{}\mathrm{D}$ and $\mathrm{E}$ undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions. Tabulate your answers in the format given below.
(i) When silver nitrate solution is added to a solution of $\mathrm{A}$, a white precipitate, insoluble in dilute nitric acid, is formed.
(ii) Addition of dilute hydrochloric acid to $\mathrm{B}$ produces a gas, which turns lead acetate paper black.
(iii) When a freshly prepared solution of ferrous sulphate is added to a solution of $\mathrm{C}$ and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
(iv) When dilute sulphuric acid is added to $\mathrm{D}$ gas is produced, which turns acidified potassium dichromate solution from orange to green.
(v) Addition of dilute hydrochloric acid to $\mathrm{E}$ produces an effervescence. The gas produced turns lime water milky but does not affect the acidified potassium dichromate solution.

State one relevant observation for the following:

Barium chloride solution is slowly added to sodium sulphate solution.