Discussion
Assertion (A) : Uranium undergoes nuclear fusion reaction.
Reason (R) : It has a big, unstable nucleus.
Answer: D
Correct answer: A is false but R is true.
Uranium does have a large, unstable nucleus, so R is true. But a heavy unstable nucleus splits: uranium undergoes nuclear fission, not fusion, which is the joining of light nuclei such as hydrogen. A is false.
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