Which one of the following statements is correct about the difference(s) between chemical and nuclear reactions?

A nuclear reaction results in the release of huge amounts of energy while chemical reactions always absorb energy.

A chemical reaction results in a change in entropy while nuclear reactions do not result in a change in entropy.

A chemical reaction does not follow the law of conservation of mass while a nuclear reaction does.

Both are very similar in nature except a nuclear reaction results in the release of some extra heat.

Nuclear reactions result in the change in identities of the reactants while elemental identities are preserved in chemical reactions.