Which compounds produce oxygen gas on thermal decomposition?

When potassium chlorate is decomposed, it forms potassium chloride and oxygen. It is a type of decomposition reaction. Decomposition reactions are reactions in which a compound breaks into two or simpler substances, that is, elements or compounds.

This reaction takes place at a temperature of 150–300 degrees Celsius. Manganese oxide is used as a catalyst in this reaction.
$2\mathit{KCl}{O}_3\to 2\mathit{KCl}+3O_2$