Which of the following substances change red litmus paper to blue?

Milk of magnesia

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Tomato

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Soap

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Limewater

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Solution

The correct options are
A Milk of magnesia
C Soap
D Limewater
Red litmus turns blue when it is placed in a basic solution.
Milk of magnesia, soap and limewater contains magnesium hydroxide, sodium hydroxide and calcium hydroxide respectively which are bases. So they turn red litmus blue. Tomato contains citric acid. Acids does not have any effect on red litmus paper.

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Which of the following substances will change the colour of red litmus into blue?

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