Question

A student was heating oxides of element X and Y. The oxide of X on

heating gave an element A which is a metal at room temperature and

a colourless odourless gas B, whereas the oxide of Y on heating gave

calcium oxide and a gas C which can turn lime water milky.

(3)

a) Identify X, Y

b) Name A, B and C.

c) Identify the type of reaction involved in the above statements.​

Answer 1

Answer:

Resultant carbon dioxide passed through limewater in the right tube, producing a milky solution due to precipitation of the insoluble suspension of calcium carbonate: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O. If excess CO2 is added: the following reaction takes place: CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)