Question

When copper carbonate is heated it releases brisk effervescence given by gas?

• A. $C{O}_2$
• B. $H_2$
• C. $H_{2}S$
• D. $HCl$

Answer 1

The correct option is A $C{O}_2$

A reaction in which a substance is broken down into at least two other substances by heat is called thermal decomposition. If limewater is shaken with a sample of the gas produced, the limewater turns milky. This shows that the gas is carbon dioxide. The solid in the test tube changes colour as the copper carbonate breaks down to copper oxide and carbon
dioxide.
$CuC{O}_3\to CuO+C{O}_2$