A Drop of colourless liquid was placed on blue litmus paper. The litmus paper turned red. The liquid could be :
(1) dilute hydrochloric acid
(2) dilute sodium hydroxide solution
(3) distilled water
(4) sodium bicarbonate solution

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Solution

Acids turn blue litmus paper to red, so among the following options dilute hydrochloric acid will turn blue litmus to red.

Hence the correct option is 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 : (1) dilute hydrochloric acid (2) dilute sodium hydroxide solution (3) distilled water (4) sodium bicarbonate solution

Acids turn blue litmus paper to red, so among the following options dilute hydrochloric acid will turn blue litmus to red. Hence the correct option is 1.

A Drop of colourless liquid was placed on blue litmus paper. The litmus paper turned red. The liquid could be :
(1) dilute hydrochloric acid
(2) dilute sodium hydroxide solution
(3) distilled water
(4) sodium bicarbonate solution

Acids turn blue litmus paper to red, so among the following options dilute hydrochloric acid will turn blue litmus to red.

Hence the correct option is 1.