Question

Assertion (A): Concentrated sulphuric acid is more viscous than water.

Reason (R): Concentrated sulphuric acid has a great affinity for water.

Options

• If both A and R are true, and R is the correct explanation of A.

• If both A and R are true, but R is not the correct explanation of А.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

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

Explanation:

The assertion is true because concentrated sulphuric acid is a thick, syrupy liquid that is much more viscous than water due to extensive intermolecular hydrogen bonding among its molecules. The reason is also true because concentrated sulphuric acid is highly hygroscopic and has a massive affinity for water. However, the reason is not the correct explanation because its affinity for water does not explain why the isolated acid molecules experience internal friction and flow slowly.