2 mL of ethanoic acid was taken in each of the 3 test tubes A, B and C. To these test tubes 2 mL, 4 mL and 8 mL of water was added respectively. Which test tube will give a clear solution?

Test tube A only

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Test tube B only

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Both test tubes A and B

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All three test tubes

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Solution

The correct option is D
All three test tubes

Ethanoic acid and water are miscible in all proportions. Ethanoic acid has a methyl group attached to the carboxylic group $(- C O O H)$ , and this polar carboxylic group interacts with polar water molecules. Hence, it's for this reason that ethanoic acid dissolves in any proportion in water.

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