Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 2 - Chapter 2 Acids, Bases and Salts

Question 1 Exercise

What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?

(a) Methyl orange (b) litmus (c) red cabbage extract


Indicators are dyes or colours. When the pH of the solution changes these indicators show different characteristic colours specific to their nature.

(a) When methyl orange is added to a base or alkali, it turns into yellow colour. Methyl orange is a synthetic indicator.

(b) Litmus paper changes into blue when dipped in base solution. It changes colour from red to blue as the solution is alkaline in nature.

(c) Red cabbage extract turns into green colour when added to a base.

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