Question

A solid compound ‘A’ decomposes on heating into ‘B’ and a gas ‘C’. On passing the gas ‘C’ through water, it becomes acidic. Identify A, B, and C.

Answer 1

A – CaCO₃, solid compound

‘A’ decomposes on heating into ‘B’ and a gas ‘C’.

\[\ce{\underset{\text{Calcium carbonate}}{CaCO3_{(s)}}->[\Delta]\underset{\text{(B)}}{CaO_{(s)}} + \underset{\text{(C)}}{CO2_{(g)}↑}}\]

On passing the gas CO₂ through water, it becomes acidic.

\[\ce{H2O_{(l)} + CO2_{(g)}->\underset{\text{Carbonic acid Acidic}}{H2CO3_{(aq)}}}\]

A – CaCO₃, Calcium carbonate
B – CaO, Calcium oxide
C – CO₂, Carbondioxide gas