A) \[\text{Ca}{{\left( \text{HC}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}\]
B) \[\text{CaC}{{\text{O}}_{\text{3}}}\]
C) \[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\]
D) \[{{\text{K}}_{2}}C{{O}_{3}}\]
Correct Answer: B
Solution :
Compound 'X' is \[~\text{CaC}{{\text{O}}_{\text{3}}}.\] \[\underset{'X'}{\mathop{CaC{{O}_{3}}}}\,\xrightarrow{\Delta }\underset{\operatorname{Re}sidue}{\mathop{CaO}}\,+C{{O}_{2}}\uparrow \] \[\underset{\text{Residue}}{\mathop{CaO}}\,+{{H}_{2}}O\xrightarrow{{}}Ca{{\underset{'Y'}{\mathop{(OH)}}\,}_{2}}\] \[Ca\underset{'Y'}{\mathop{{{(OH)}_{2}}}}\,+\underset{Excess}{\mathop{C{{O}_{2}}}}\,+{{H}_{2}}O\xrightarrow{{}}Ca{{(HC{{O}_{3}})}_{2}}\] \[Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{\Delta }\underset{'X'}{\mathop{CaC{{O}_{3}}}}\,+{{H}_{2}}O+C{{O}_{2}}\uparrow \]
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