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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2024 · Mains Paper I

Q5(b). Balancing nuclear capture products

Question

Identify the required particles to produce the listed product nuclei. [Scheme given in the paper: starting from ²⁷₁₃Al and leading separately to ²⁸₁₄Si, ²⁸₁₃Al, ³¹₁₅P, ³⁵₁₇Cl and ³⁹₁₉K; each incoming particle is marked “?”]

Answer in brief

Required net additions are ¹₁H, ¹₀n, ⁴₂He, ⁸₄Be and ¹²₆C respectively; for chlorine the equivalent net input is two α particles.

Part of VKC Basic

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Coversnuclear reactionsconservation of mass numberaluminium-27alpha captureneutron capture

All parts of Question 5