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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A Drop of colourless liquid was placed on blue litmus paper. The litmus paper turned red. The liquid could be :
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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

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.

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

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.