A block of ice at -10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represents 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 A The change of ice at -10∘C into steam at 100∘C occurs in four stages, it is represented by a curve. I Stage – The temperature of ice changesfrom - 10∘Cto0∘C. II Stage – Ice at 0∘C changes in water at 0∘C. The state changes as heat is supplied. III Stage – Water at 0∘C changes into water at 100∘C. IV Stage – Water at 100∘C change into steam at 100∘C.