Which of the following substance will turn blue litmus red?

Toothpaste

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Tomato juice

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Detergent

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Soap

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Solution

The correct option is B Tomato juice
Tomato juice has small amounts of citric acid and malic acid, which converts the blue litmus paper to red. Toothpase, Detergent and Soap on the other hand are basic and alkaline in nature, they don't have any effect on the Blue litmus paper.

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