Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?
(a) Yellow in both acid and base
(b) Yellow in acid and red in base
(c) Pink in acid and yellow in base
(d) Red in acid and blue in base

Correct Answer: (b) Yellow in acid and red in base

Explanation: Turmeric is a yellow colour acid-base indicator. It remains yellow in acid and changes its colour to red in the base.