| List I | List II | |
| 1. | Heavy water | Bicarbonates of Mg and Ca in water |
| 2. | Temporary hard water | No foreign ions in water |
| 3. | Soft water | \[{{D}_{2}}O\] |
| 4. | Permanent hard water | Sulphates and chlorides of Mg and Ca in water |
A) 1-c, 2-d, 3-b, 4-a
B) 1-b, 2-a, 3-c, 4-d
C) 1-b, 2-d, 3-c, 4-a
D) 1-c, 2-a, 3-b, 4-d
Correct Answer: D
Solution :
Heavy water is \[{{D}_{2}}O\] (1 - c) Temporary hard water contains bicarbonates of \[C{{a}^{2+}}\] and \[M{{g}^{2+}}(2-a)\] Soft water may have no foreign ions\[(3-b)\]. Permanent hard water contains sulphates and chlorides of \[C{{a}^{+2}}\] and \[M{{g}^{2+}}(4-d)\]
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