Question

chemical reactions involved in working of nuclear weapons

Answer 1

Nuclear Chemistry Behind the Explosion. Atomic bombs are made up of a fissile element, such as uranium, that is enriched in the isotope that can sustain a fissionnuclear chain reaction. ... This creates the chain reaction.

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Answer 2

A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of this reactions. The specific nuclear reaction may be the fission of heavy isotopes.
For example:- Uranium 235
The nuclear chain reaction releases several million times more energy per reaction than any chemical reaction.