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  4. Assertion: In pressure temperature (P-T) phase diagram of water, the slope of the melting curve is found to be negative. Reason: Ice contracts on melting to water.

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Q. Assertion : In pressure temperature $(P-T)$ phase diagram of water, the slope of the melting curve is found to be negative.
Reason : Ice contracts on melting to water.

AIIMSAIIMS 2005Thermal Properties of Matter

Solution:

The phase diagram that is pressure temperature diagram of water is as shown. In phase diagram of water, the solid-liquid phase boundary has a negative slope. This reflects the fact that ice has a lower density than water which is an usual property i.e., ice contracts on

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