question_answer

A solid compound 'X' on heating gives \[C{{O}_{2}}\]gas and a residue. The residue mixed with water forms on passing an excess of \[C{{O}_{2}}\]through ‘Y’ in water, a clear solution, 'Z' is obtained. On boiling 'Z' compound 'X' is reformed. The compound 'X' is:                              [AIPMT (S) 2004]

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 :

[b] Compound 'X' is