In a P-T diagram for pure substance, the melting line has highest inclination with respect to the positive horizontal axis representing temperature for which type of substance?

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SSC JE ME Previous Paper 3 ( Held on: 23 Jan 2018 Morning)
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  1. A substance that contracts on freezing.
  2. Substance that expands on freezing.
  3. A substance that has same volume on freezing.
  4. None of these

Answer (Detailed Solution Below)

Option 2 : Substance that expands on freezing.
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Detailed Solution

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Fusion is the solid to liquid phase transition.

SSC JE Mechanical 3 10Q Hindi - Final images Q7

For water, v” < v’ (Indicating contraction) \(\Rightarrow \frac{{dp}}{{dT}} \to - ve\)

For most other substances v” > v’ (expansion) \(\Rightarrow \frac{{dp}}{{dT}} \to + \;ve\)
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