Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ch-1945: NEET 2010 Chemistry - Class 11 AIPMT-2010-Ch-1945 Solution: The compound A on heating gives a colourless gas and a residue…

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of

CO_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 is

Multiple Choice Options

A $CaCO_3$
B $Na_2CO_3$
C $K_2CO_3$
D $CaSO_4\cdot2H_2O$

Step-by-Step Verified Solution

A _ _ colourless gas + residue Residue + H 2 O _ B _ e x c e s s C O 2 C _ _ A This is possible only when �A� is CaCO 3 . The reactions are as follow :

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