Question

Which of the following does not give metal oxide on heating $-$

• A. $MgC{O}_3$
• B. $L{i}_{2}C{O}_3$
• C. $K_{2}C{O}_3$
• D. $ZnC{O}_3$

Answer 1

The correct option is C $K_{2}C{O}_3$

Metal carbonates decompose on heating to form a metal oxide and carbon dioxide. Potassium carbonate does not decompose on bunsen temperature. It requires a high temperature.

Potassium carbonate on heating to a high temperature gives potassium oxide and carbon dioxide.

$K_{2}C{O}_3\stackrel{373K}{\to }{K}_{2}O+C{O}_2$