Which of the following compounds turns red litmus to blue?

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Methanol

Ethanol

Ethanoic Acid

Sodium Hydroxide

answer is D.

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Detailed Solution

Sodium hydroxide will change the colour of the litmus paper from red to blue.
The litmus paper is used as an indicator to determine the pH value of a compound. An acid will turn a blue litmus paper into red and a base turns red litmus to blue on the other hand a neutral compound does not change the colour of litmus.

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