A) Water containing \[CaC{{l}_{2}}\]
B) Water containing dil. HCl
C) Water containing \[MgS{{O}_{4}}\]
D) None of these
Correct Answer: D
Solution :
Water containing \[C{{a}^{+2}},\ M{{g}^{+2}}\] and \[{{H}^{+}}(>{{10}^{-7}}m)\] is a hard water. \[{{H}^{+}}(aq)+C{{H}_{3}}COONa(aq)\]⇌ \[C{{H}_{3}}COOH(s)+N{{a}^{+}}(aq)\]
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