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Hard water is not fit for washing clothes because

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Hard water is not fit for washing clothes because
A. it contains `Na_(2)SO_(4)` and `KCl`
B. it gives precipitate
C. it contains impurities
D. it is acidic in nature
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Correct Answer - B
`{:(2RCOONa+Mg^(2+)tounderset("Insoluble")((RCOO)_(2))Mg+2Na^(o+)),(2RCOONa+Ca^(2+)tounderset("Insoluble")((RCOO)_(2))Ca+2Na^(o+)):}`
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