A) Slaked lime
B) Plaster of Paris
C) Cuprous
D) Hydrolith
Correct Answer: A
Solution :
Slaked lime removes temporary hardness of water. \[Ca{{(OH)}_{2}}+\underset{\text{From hard water}}{\mathop{Ca{{(HC{{O}_{3}})}_{2}}}}\,\to 2CaC{{O}_{3}}\downarrow +2{{H}_{2}}O\]
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