A) \[CaC{{O}_{3}}\]
B) \[CaO\]
C) \[Ca{{(OH)}_{2}}\]
D) \[Ca{{(HC{{O}_{3}})}_{2}}\]
Correct Answer: C
Solution :
[c] Lime water \[[Ca{{(OH)}_{2}}]\]is used to remove the temporary hardness of water. \[[Ca{{(OH)}_{2}}]\]reacts with bicarbonates of Ca to form insoluble carbonate. \[Ca(HC{{O}_{3}})(aq)+Ca{{(OH)}_{2}}\to 2CaC{{O}_{3}}\downarrow +2{{H}_{2}}O\] \[Ca{{(OH)}_{2}}+N{{a}_{2}}C{{O}_{3}}\to NaOH+CaC{{O}_{3}}\] \[Ca{{(OH)}_{2}}+C{{O}_{2}}\to CaC{{O}_{3}}+{{H}_{2}}O\]
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