A) \[CaC{{O}_{3}}\]
B) CaO
C) \[Ca{{(OH)}_{2}}\]
D) \[Ca{{(HC{{O}_{3}})}_{2}}\]
Correct Answer: C
Solution :
\[Ca{{(OH)}_{2}}\] is used for the softening of temporary hard water. \[Ca{{(OH)}_{2}}(aq)+C{{O}_{2}}(g)\to \underset{\text{cloudiness}}{\mathop{CaC{{O}_{3}}(s)}}\,+{{H}_{2}}O(l)\]
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