Question

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.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(2)

Explanation:

Pure sulphuric acid is almost a non-conductor of electricity because it contains very few free ions. Therefore, the Assertion (A) is true.

Dilute sulphuric acid is a good conductor of electricity because it ionises in water to produce mobile ions such as H⁺, \[\ce{HSO^-_4}\], and \[\ce{SO^2-_4}\]. Therefore, the Reason (R) is also true.

However, the Reason states a property of dilute sulphuric acid and does not directly explain why pure sulphuric acid is almost a non-conductor.

Hence, both A and R are true, but R is not the correct explanation of A.