When the strip of pH paper was put in a given solution, the pH paper changed to orange-red. The given solution is most likely to be

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Sodium hydroxide

Hydrochloric acid

Sodium bicarbonate

Ethanoic acid

answer is D.

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Detailed Solution

The solution is most likely to be an acid that is Ethanoic acid. Since the strip of pH paper turns orange-red, this indicates that the solution is most likely to be an acid. From the options given, only hydrochloric acid (

HCl

) and ethanoic acid (

C H_{3} COOH

) are acids of which

HCl

is a very strong acid which gives red colour on the strip and is not possible and since

{CH}_{3} COOH

is a weak acid it will give orange-red on the strip.

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