question_answer

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound A is [AIPMT (M) 2010]

A) \[CaC{{O}_{3}}\]

B) \[N{{a}_{2}}C{{O}_{3}}\]

C) \[{{K}_{2}}C{{O}_{3}}\]

D) \[CaS{{O}_{4}}\cdot 2{{H}_{2}}O\]

Correct Answer: A

Solution :

[a] Given,

Thus, the compound 'A' must be and the reactions are as follows