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GATE 2025 Chemical Engineering, Q29 · Reaction Engineering

The correct answer is B, (P)→(II), (Q)→(III), (R)→(I).

Question

Choose the option that correctly matches the items in Group 1 with those in Group 2. Group 1: (P) Coking, (Q) Poisoning, (R) Sintering. Group 2: (I) Prolonged exposure of catalyst to high temperature, (II) Deposition of carbonaceous material on catalyst surface, (III) Irreversible chemisorption of molecules on active sites of catalyst.

  • A. (P)→(III), (Q)→(I), (R)→(II)
  • B. (P)→(II), (Q)→(III), (R)→(I)
  • C. (P)→(II), (Q)→(I), (R)→(III)
  • D. (P)→(I), (Q)→(III), (R)→(II)

Official answer: (P)→(II), (Q)→(III), (R)→(I)

Why

GATE 2025 official key: (B). Coking = carbon deposition (II); Poisoning = irreversible chemisorption on active sites (III); Sintering = prolonged high-temperature exposure causing loss of active surface area (I).

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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