What are indicators? Name any two natural indicators and write one colour change shown by each.
Model Answer
Indicators are substances that show different colors in acidic and basic solutions. Two natural indicators are turmeric and litmus. Turmeric turns reddish-brown in base and remains yellow in acid. Litmus turns red in acid and blue in base.
Explanation
The option correctly defines indicators as substances that change color in acidic or basic solutions and provides two natural examples, turmeric and litmus, along with their characteristic color changes.