A) \[N{{a}^{+}}\] and \[{{K}^{+}}\]
B) \[C{{a}^{2+}}\] and \[M{{g}^{2+}}\]
C) \[C{{a}^{2+}}\] and \[{{K}^{+}}\]
D) \[C{{a}^{2+}}\] and \[N{{a}^{+}}\]
Correct Answer: B
Solution :
Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of calcium and magnesium in it. These \[C{{a}^{2+}}\] and \[M{{g}^{2+}}\] ions react with the anions of fatty acids present in soaps to form curdy white precipitate. As a result, hard water does not produce foam with soap immediately.
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