Name the gas that smells of rotten eggs.

Copper (II) carbonate is a green solid which decomposes on heating to form _____ gas.

(Write the name of the gas.)

The chemical equation for the combustion of ethane is
$2\mathrm{}{\mathrm{C}}_2{\mathrm{H}}_6+7{\mathrm{O}}_2\to 4\mathrm{}{\mathrm{C}\mathrm{O}}_2+6\mathrm{}{\mathrm{H}}_2\mathrm{O}$
$60\mathrm{}\mathrm{g}$ of ethane was completely burnt in oxygen. Answer the following question:

How would you test the presence of water as a product of this reaction?

Name the gas evolved when hydrochloric acid is added to zinc sulphate.

“Note: This question given in the book seems to have an error and the modified question should be as given below.”

Name the gas evolved when hydrochloric acid is added to zinc sulphide.