A colourless liquid sample was tested with pH paper strip. The colour of the strip changed to reddish pink. The sample could be :
(1) tap water
(2) sodium hydroxide solution
(3) distilled water
(4) ethanoic acid solution

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Solution

Bases turn red litmus paper to blue and acids turn blue litmus paper to red. Here the colour of litmus paper changes to reddish pink so the colourless solution must be acid. Ethanoic acid can convert blue litmus paper to reddish pink.

Hence, the correct answer is option 4.

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A colourless liquid sample was tested with pH paper strip. The colour of the strip changed to reddish pink. The sample could be : (1) tap water (2) sodium hydroxide solution (3) distilled water (4) ethanoic acid solution

Bases turn red litmus paper to blue and acids turn blue litmus paper to red. Here the colour of litmus paper changes to reddish pink so the colourless solution must be acid. Ethanoic acid can convert blue litmus paper to reddish pink. Hence, the correct answer is option 4.

A colourless liquid sample was tested with pH paper strip. The colour of the strip changed to reddish pink. The sample could be :
(1) tap water
(2) sodium hydroxide solution
(3) distilled water
(4) ethanoic acid solution

Bases turn red litmus paper to blue and acids turn blue litmus paper to red. Here the colour of litmus paper changes to reddish pink so the colourless solution must be acid. Ethanoic acid can convert blue litmus paper to reddish pink.

Hence, the correct answer is option 4.