Question

Lead carbonate is heated. The color of its residue is

Answer 1

Decomposition of metal carbonates:

• When Metal carbonates are heated they decompose to form a metal oxide and release carbon dioxide gas.
• The only difference is some metals decompose more readily while others do not.
• Lead carbonate is a white amorphous powder, which on heating produces lead oxide with carbon dioxide gas.

$\underset{\mathrm{Lead}\mathrm{carbonate}(\mathrm{White}\mathrm{colour})}{{\mathrm{PbCO}}_3\left(\mathrm{s}\right)}+\mathrm{Heat}\to \underset{\mathrm{Lead}\mathrm{oxide}(\mathrm{Yellow}\mathrm{colour})}{\mathrm{PbO}\left(\mathrm{s}\right)}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$

• The residues formed in this reaction are of Lead oxide which is yellow in color.

Therefore, The color of the residue is yellow.