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 -

Question

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 - (A) Na2 CO3 (B) K2 CO3 (C) CaSO4.2H2O (D) CaCO3

Tardigrade Admin · Accepted Answer

Given, Thus, the compound 'A' must be CaCO3 and the reactions are as follows

Q. The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of $C O_{2}$ 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 -

$N a_{2} C O_{3}$

$K_{2} C O_{3}$

$C a S O_{4} .2 H_{2} O$

$C a C O_{3}$

Given,
Thus, the compound $^{'} A^{'}$ must be $C a C O_{3}$ and the reactions are as follows

Q. 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 -

Na2​CO3​

K2​CO3​

CaSO4​.2H2​O

CaCO3​