In an atomic bomb, neutrons react with a uranium atom to produce krypton, barium, and other products, which all release energy. what type of a reaction is this?
fusion
fission
decomposition
combustion

Answer : The correct option is, fission.

Explanation :

Nuclear fusion : It is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

Nuclear fission : It is a process which involves the conversion of a heavier nuclei with neutron into two or more small and stable nuclei along with the release of energy.

Decomposition reaction : It is a type of reaction in which a single larger compound decomposes to give two or more smaller molecules as a product.

Combustion reaction : It is a type of reaction in which a hydrocarbon molecule react with the oxygen to give carbon dioxide and water as a product.

When neutrons react with a uranium atom then it produce krypton, barium, and other products with release of energy. So, this reaction is a nuclear fission reaction.

The complete nuclear fission reaction will be:

Hence, the correct option is, fission.