Question

Evolution of CO2 gas is tested by passing through lime water,
it is converted to milky and by excess passing the milkyness
disappeared. The compound responsible for white ppt and
milkyness disappearance are:
(A)CaCO3, CaO
(B) CaCO3, Ca(HCO3)2
(C)CaO, Ca(OH)2
(D) None of these
​

Answer 1

Answer:

(C)CaO, Ca(OH)2

Explanation:

When carbon dioxide gas is passed through or over limewater, it turns milky due to the formation of calcium carbonate.