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Question

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


A
Sodium hydroxide
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B
Sulphuric acid
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C
Vinegar
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D
Lemon juice
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Solution

The correct option is A 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.

Chemistry

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