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Question

A block of ice at - 10C is slowly heated and converted to steam at 100C. Which of the following curves represent the phenomenon qualitatively?

A
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B
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C
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D
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Solution

The correct option is B
The change of ice at 10C into steam at 100C occurs in four stages.
  1. The temperature of ice changes from 10C to 0C.
  2. Ice at 0C changes to water at 0C. The state changes as heat is supplied.
  3. Water at 0C changes into water at 100C.
  4. Water at 100C change into steam at 100C. The state changes as heat is supplied.

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