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Question

Which of the following is an example of a visual indicator?


Your Answer
A

Onion

Your Answer
B

Clove

Correct Answer
C

Extract of red cabbage

Your Answer
D

Vanilla extract


Solution

The correct option is C

Extract of red cabbage


A visual indicator is a natural or a synthetic indicator that changes its colour on the addition of an acid or a base.
Red cabbage extract is a purplish- blue coloured solution that turns red in acidic medium and green in basic medium. So, red cabbage extract is an example of a visual indicator.

Onion, clove and vanilla extract are olfactory indicators because they respond to acids and bases by change in odour.

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