Why are decomposition reactions mostly endothermic in nature?

State whether the following statesments are true or false : All combustion reactions are exothermic in nature.

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

State whether the following statesments are true or false : Decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important decomposition reaction used in varoius industries.

Which force is mostly exist in nature and why?

Give two examples of decomposition reactions.

Write reaction to justify amphoteric nature of aluminium.