A student placed a few drops of a liquid over a portion of the red litmus paper as shown here. He observed that the red litmus paper turned blue. The liquid could be :

(1) dilute hydrochloric acid
(2) dilute sodium hydroxide
(3) water
(4) dilute acetic acid

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Solution

Bases turn blue litmus paper to red. Dilute sodium hydroxide convert red litmus to blue so; it is a base.

Hence the correct option is 2.

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Similar questions

Q. The colour of the pH paper strip turned red when it was dipped into a sample. The sample could be :
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Dry hydrogen chloride gas does not turn blue litmus red whereas dilute hydrochloric acid does.

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A student placed a few drops of a liquid over a portion of the red litmus paper as shown here. He observed that the red litmus paper turned blue. The liquid could be : (1) dilute hydrochloric acid (2) dilute sodium hydroxide (3) water (4) dilute acetic acid

Bases turn blue litmus paper to red. Dilute sodium hydroxide convert red litmus to blue so; it is a base. Hence the correct option is 2.

A student placed a few drops of a liquid over a portion of the red litmus paper as shown here. He observed that the red litmus paper turned blue. The liquid could be :

(1) dilute hydrochloric acid
(2) dilute sodium hydroxide
(3) water
(4) dilute acetic acid

Bases turn blue litmus paper to red. Dilute sodium hydroxide convert red litmus to blue so; it is a base.

Hence the correct option is 2.