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

Correct answer: (4) dilute hydrochloric acid.

Explanation: Bases turn red litmus to blue and acids turn blue litmus to red. Hence, dilute hydrochloric acid will turn blue litmus to red.

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Updated on: 10-Oct-2022

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(1)dilute sodium bicarbonate solution	(2)tap water
(3) dilute sodium hydroxide solution	(4) dilute hydrochloric acid

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