A) \[{{D}_{2}}O\]
B) \[{{H}_{2}}O\]
C) \[{{H}_{2}}{{O}_{2}}\]
D) \[{{H}_{2}}S{{O}_{2}}\]
Correct Answer: A
Solution :
Moderator is a substance which slow down the speed of fast moving neutrons produced during fission reaction in a nuclear reactor, so that the neutrons are easily captured by the fuel. Graphite and heavy water \[({{D}_{2}}O)\] are generally used as moderator.
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