Which of the following can change the colour of red litmus to blue?

Vinegar

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Lemon juice

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Sulphuric acid

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Sodium hydroxide

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Solution

The correct option is D Sodium hydroxide
Red litmus paper turns into blue when dipped in a basic solution.
Among the given options, only sodium hydroxide is a base. Hence, it changes the colour of red litmus to blue.
Rest of the substances are acidic, hence they do not have any effect on red litmus.

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Out of the following options, select all the compounds that can change the colour of wet blue litmus paper into the red colour?

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