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Specific Heat

The freezing ...

Question

The freezing and boiling points of a substance P are -220℃ and -185℃ respectively. At which of the following range of temperatures will P exist as a liquid? (A) Between -175℃and -210℃ (B) Between -190℃ and -225℃ (C) Between -200℃ and -160℃ (D) Between -195℃ and -215℃

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Solution

Freezing point is the temperature below which the substance solidifies i.e. a liquid turns
into a solid when cooled.
below the temperature i.e., -220°C substance solidifies.
And boiling point is the temperature above which liquid changes into a vapour i.e., gas
i.e., it will remain (p) liquid between the range of -195°C to —215°C.
Hence, the correct answer is (D)

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