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Question

Why don’t stains erase when washed with water alone?

A
Water is a non polar solvent and hence can not remove the stains.
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B
Most stains are oily in nature.
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C
Water forms a precipitate with the stains and sticks to the clothes.
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D
Water forms micelles with strains.
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Solution

The correct option is B Most stains are oily in nature.
Most stains are oily in nature. Oil doesn’t dissolve in water as its molecules are non-polar while water is a polar solvent. Hence we need a chemical substance that attaches itself to the oil molecules and removes it from clothes.

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