Which of the following is used as an acid bath in dyeing cotton and wool?

Methanoic acid

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Acetic acid

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Benzoic acid

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Sulphuric acid

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Solution

The correct option is A Methanoic acid
Methanoic acid gives water-repellent finishing in dyeing. Hence formic acid or methanoic acid is used in both in the dyeing of cotton and wool.

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