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GATE 2019 MT – Question 39

Metallurgical Thermodynamics · Phase equilibria and phase diagrams · 2 marks · Multiple choice

Match P peritectic, Q monotectic, R eutectoid, S syntectic with reactions 1 γ→α+β; 2 L₁+L₂→α; 3 L₁→L₂+α; 4 L+α→β. Greek letters are solids and L denotes liquid.

  1. P–4, Q–3, R–1, S–2
  2. P–3, Q–4, R–2, S–1
  3. P–1, Q–3, R–4, S–2
  4. P–4, Q–2, R–3, S–1

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Show answer and explanation

Correct answer: (A) P–4, Q–3, R–1, S–2

Explanation

Peritectic combines liquid and solid into another solid (4). Monotectic decomposes one liquid into a different liquid and solid (3). Eutectoid decomposes one solid into two solids (1). Syntectic combines two liquids into a solid (2). The complete matching is A.

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