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A block of ice at -10^@C is slowly heate...

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

B

C

D

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The correct Answer is:
A
Initially, on heating temperature rises from `-10^(@)C` to `0^(@)C`. Then ice melts and temperature does not rise. After the whole ice has melted, temperature begins to rise unit it reaches `100^(@)C`. Then it becomes constant, as at the boling point will not rise.
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