The diagram represents the preparation of sodium sulphate salt from dil. H₂SO₄ acid and sodium hydroxide.

1. Name the apparatus 'A'.
2. Name the substance 'X' placed in 'A' and the substance 'Y' placed in B.
3. State the reason for conducting the titration using the apparatus 'A' and 'B'.
4. State which solution is transferred to the evaporating dish and evaporated to point of crystallization for obtaining the salt.
5. State why titration is not conducted for the preparation of copper [II] sulphate crystals by neutralization.

Give reasons for the following:

Concentrated sulphuric acid is a weaker acid compared to dilute sulphuric acid.

Identify which of the following terms matches with the appropriate descriptions 1 to 5.

A: Hydracid

B: Monobasic acid

C: Less volatile acid

D: Weak acid

E: Tribasic acid

F: Dibasic acid

G: More volatile acid

1. An acid having basicity 1 and having only one replaceable hydrogen ion per molecule of the acid.
2. An acid which dissociates to give a low concentration of H⁺ ions.
3. An acid containing hydrogen and a non-metallic element other than oxygen.
4. The type of acid which generally displaces another acid when the acid is heated with a salt.
5. The type of acid which reacts with a base to give an acid salt and a normal salt.

State which of the following methods is generally used for preparing the salts 1 to 5 given below:

A: Neutralisation — insoluble base and dil. acid

B: Neutralisation — alkali and dil. acid

C: Simple displacement — active metal and dil. acid

D: Direct combination

E: Precipitation [double decomposition]

1. PbCO₃
2. Zn(NO₃)₂
3. NaCl
4. Cu(NO₃)₂
5. FeS