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JEE Main 2025 (3 Apr, Shift 1) · Nuclear Fission & Fusion

Nuclear Fission & Fusion question from JEE Main 2025 (3 Apr, Shift 1)

Q5JEE Main 2025 · 3 APR · SHIFT 1Medium

Nuclear Fission & Fusion

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

List - IList - II
A. 01n+92235U→54140Xe+3894Sr+2 01n{}^{1}_{0}\text{n} + {}^{235}_{92}\text{U} \rightarrow {}^{140}_{54}\text{Xe} + {}^{94}_{38}\text{Sr} + 2\,{}^{1}_{0}\text{n}I. Chemical reaction
B. 2H2+O2→2H2O2\text{H}_{2} + \text{O}_{2} \rightarrow 2\text{H}_{2}\text{O}II. Fusion with +ve Q value
C. 12H+12H→23He+01n{}^{2}_{1}\text{H} + {}^{2}_{1}\text{H} \rightarrow {}^{3}_{2}\text{He} + {}^{1}_{0}\text{n}III. Fission
D. 11H+13H→12H+12H{}^{1}_{1}\text{H} + {}^{3}_{1}\text{H} \rightarrow {}^{2}_{1}\text{H} + {}^{2}_{1}\text{H}IV. Fusion with -ve Q value
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Answer: (b)

  1. A: a neutron splits 235U{}^{235}\text{U} into Xe and Sr, so it is fission (III).
  2. B: hydrogen and oxygen form water, a chemical reaction (I).
  3. C: D+D→3He+n\text{D}+\text{D} \to {}^3\text{He} + n releases about 3.3 MeV3.3\text{ MeV}: fusion with +ve Q (II).
  4. D: 1H+3H→2 2H{}^1\text{H} + {}^3\text{H} \to 2\,{}^2\text{H} moves to less tightly bound nuclei, so Q is negative: fusion with -ve Q (IV).
  5. So the answer is (b) A-III, B-I, C-II, D-IV.
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