Question

Assertion (A): pH of normal water is seven.

Reason (R): Normal water gives no colour with universal indicator.

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 A.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If A is true, but R is false.

Explanation:

The assertion is true because pure, normal water at room temperature contains an equal concentration of hydrogen (H⁺) and hydroxide (OH⁻) ions, making it neutral with a pH of exactly 7. The reason is false because a universal indicator changes colour across the entire pH scale rather than remaining colourless. When added to normal water, the universal indicator changes to a distinct green colour to signify neutrality.