Question

36. The carbonate of metal X is a white solid. It decompose when heated to form carbon dioxide and yellow solid oxide. What is metal X?

Answer 1

Metal X is lead.

Lead carbonate is a white solid amorphous powder which is obtained when lead carbonate is heated and carbon dioxide gas is also evolved.

Reaction -

$Pb{CO}_3\left(s\right)\underrightarrow{\Delta }PbO\left(s\right)+C{O}_2\left(g\right)$

Hence the reaction of heating of lead carbonate leads to formation of lead oxide which is yellow solid mass and carbon dioxide is also evolved.

Conclusion - Hence the Metal X is Lead.