Q48 · CSIR-NET Chemistry, December 2017
Paper: CSIR-NET December 2017 · Subject: Inorganic Chemistry · Chapter: Nuclear Chemistry · Topic: Nuclear Reactions Q Value · Marks: 2 · Difficulty: Medium
Among the following nuclear reactions of thermal neutrons, the cross section is highest for:
(a)${ }_{92} \mathrm{U}^{235}+{ }_{0} \mathrm{n}^{1} \rightarrow{ }_{92} \mathrm{U}^{235}+{ }_{0} \mathrm{n}^{1}$
(b)${ }_{92} \mathrm{U}^{235}+{ }_{0} \mathrm{n}^{1} \rightarrow{ }_{92} \mathrm{U}^{236}$
(c)${ }_{92} \mathrm{U}^{235}+{ }_{0} \mathrm{n}^{1} \rightarrow{ }_{90} \mathrm{Th}^{232}+{ }_{2} \mathrm{He}^{4}$
(d)${ }_{92} \mathrm{U}^{235}+{ }_{0} \mathrm{n}^{1} \rightarrow{ }_{36} \mathrm{Kr}^{94}+{ }_{56} \mathrm{Ba}^{140}+2{ }_{0} \mathrm{n}^{1}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
For thermal neutrons the ²³⁵U fission cross-section (~585 b) is highest (d).
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