A) it contains impurities
B) it is acidic in nature
C) it gives precipitate with soap
D) it contains \[N{{a}_{2}}S{{O}_{4}}\] and \[KCl\]
Correct Answer: C
Solution :
Hard water contains dissolved salts of calcium, magnesium or iron, which form insoluble precipitate with soap. \[\underset{Soap}{\mathop{2RCOONa}}\,+C{{a}^{2+}}\xrightarrow{{}}\underset{\text{Insoluble}}{\mathop{{{(RCOO)}_{2}}Ca}}\,+2N{{a}^{+}}\]
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