Which substance when dissolved in water changes red litmus paper to blue.

Tooth paste

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Milk of magnesia

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Shower cream

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All of the above

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Solution

The correct option is D All of the above
Red litmus changes to blue under alkaline conditions.
A.) Tooth paste- $N a F$
B.)Milk of magnesia- $M g (O H)_{2}$
C.)Shower cream- Basic ingredients used are alkaline in nature.
Hence, correct option is $D$ .

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