Which of the following controls the chain reaction in a nuclear reactor?

Molecules of high energy

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Ions

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Active hydrogen

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Moderator

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Solution

The correct option is D Moderator
Moderator is used in nuclear reaction as it can slow down the fast nuclear chain reaction by slowing down the neutron from fission to thermal energies.

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Nuclear reactors rely on which of the following radioactive isotopes to fuel the chain reaction?

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