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Question

The colour of the pH paper strip turned red when it was dipped into a sample. The sample could be :
(1) dilute sodium bicarbonate solution
(2) tap water
(3) dilute sodium hydroxide solution
(4) dilute hydrochloric acid

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Solution

Acids convert blue litmus paper to red. So, out of the given options dilute hydrochloric acid will turn blue litmus to red.

Hence, the correct answer is option 1.

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