Acid-base indicator — task. Chemistry CBSE Live product, Class 7 (2026-27).

Read the questions given below and select the correct answer:

1. What is an acid-base indicator?

A substance that reacts violently with acids
A substance that changes color in acids and bases
A substance that forms gas with bases
A substance that changes temperature in acids and bases

2. Which one of the following changes blue litmus paper red?

\(Ca(OH)_2\)
\(NaOH\)
\(Na_2CO_3\)
\(HCl\)

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