• # question_answer Which of the following is not a hard water 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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