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