Name the method used for the preparation of the following salts from the list given below.
(i) Sodium nitrate
(ii) Iron (III) chloride
(iii) Lead chloride
(iv) Zinc sulphate
(v) Sodium hydrogen sulphate
List
(A) Simple displacement
(B) Neutralisation
(C) Decomposition by acid
(D) Double decomposition
(E) Direct synthesis

What happens when: (write chemical equation only).

(ii) Sulphuric acid reacts with caustic soda

Choose the method of preparation of Sodium nitrate, from the methods given in the list:

[List: A. Neutralization B.Precipitation C.Direct combination D.Substitution]

Write a balanced chemical equation the following reaction:

Action of dilute sulphuric acid on sodium hydroxide.

An equal volume of molar hydrochloric acid and sulphuric acid is neutralised by dilute $\mathrm{NaOH}$ solution and $\mathrm{x} \mathrm{Kcal}$  and $\mathrm{y} \mathrm{Kcal}$ of heat are liberated. Which of the following is true?