A) \[CaC{{O}_{3}}\]
B) \[CaO\]
C) \[Ca{{(OH)}_{2}}\]
D) \[Ca{{(HC{{O}_{3}})}_{2}}\]
Correct Answer: C
Solution :
\[\underset{(A)}{\mathop{Ca{{(OH)}_{2}}}}\,+Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{{}}2CaC{{O}_{3}}\downarrow +{{H}_{2}}O\] Temporary hardness of water is removed by \[Ca{{(OH)}_{2}}\]. It converts bicarbonates into insoluble calcium and magnesium carbonate which are removed by filteration. \[\underset{A}{\mathop{Ca{{(OH)}_{2}}}}\,+\underset{sodium\text{ }carbonate}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,\xrightarrow[{}]{{}}CaC{{O}_{3}}\] \[+\underset{caustic\text{ }soda}{\mathop{2NaOH}}\,\] \[\underset{(A)}{\mathop{Ca{{(OH)}_{2}}}}\,+2C{{O}_{2}}\xrightarrow{{}}\underset{\begin{smallmatrix} calcium\text{ }bicarbonate \\ \,\,\,\,\,\,\,\,\,\,\,(cloudy) \end{smallmatrix}}{\mathop{Ca{{(HC{{O}_{3}})}_{2}}}}\,\]
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