Assertion (A): Sulphuric acid is known as the oil of vitriol.

Reason (R): Sulphuric acid was first obtained by heating crystals of green vitriol.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): V₂O₅ or Pt is used in the catalytic oxidation of sulphur dioxide

Reason (R): The catalytic oxidation of SO₂ is an exothermic reaction, so it requires to be heated to about 450°C only in the beginning.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Pure sulphuric acid is almost a non-conductor of electricity.

Reason (R): Dilute sulphuric acid is a good conductor of electricity.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Impurity of arsenic oxide must be removed before passing the mixture of SO₂ and air through the catalytic chamber.

Reason (R): Arsenic oxide poisons the catalyst.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.