Which of the compounds will leave a metal residue when heated?

daadudaniel

3 years ago

The compound that will leave a metal residue when heated is (A) Cu(NO3)2.

Cu(NO3)2 is a metal salt that contains copper ions and nitrate ions. When it is heated, the nitrate ions decompose to form nitrogen dioxide gas and oxygen gas, leaving behind solid copper oxide as a residue.

AgNO3 (B) is also a metal salt, but it contains silver ions instead of copper ions. When it is heated, it decomposes to form nitrogen dioxide gas and solid silver nitrite, which does not leave a metal residue.

K2CO3 (C) and CaCO3 (D) are both metal carbonates. When they are heated, they decompose to form carbon dioxide gas and solid metal oxide as a residue. However, metal oxides are not the same as metal residues, as they are a different chemical compound altogether.

Therefore, the correct answer is (A) Cu(NO3)2.