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 \[{{H}_{2}}O\] is due to the presence of bicarbonates, chlorides, and sulphates of Ca and Mg ions.
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