Question

State one relevant observation when crystals of copper nitrate are heated in a test tube.

Answer 1

• Copper nitrate is a greenish-blue crystalline solid that contains three molecules of water.
• On heating, it first losses its water molecules, and on further heating, it decomposes to give reddish-brown gas Nitrogen dioxide and oxygen.
• The greenish-blue crystals of copper nitrate will change to a black residue of copper oxide and give reddish-brown gas i.e., nitrogen dioxide on heating.