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A block of ice at –10°C is slowly heated and converted to steam at 100°C which of the following curves represent the phenomenon qualitatively?

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Correct option is (1)

First heat is supplied to raise temperature of ice from –10°C to 0°C. Now heat supplied is latent heat of fusion of ice. During this stage temperature remains constant at 0°C. Now heat supplied raises temperature of water formed from 0°C to 100°C. Then heat supplied is latent heat of vaporisation. There is no change in temperature due to heat given. These features are correctly represented by curve (1).

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