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.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The slope of melting curve in phase diagram is negative for water as due to increase in temperature vapour, pressure of ice decreases. The reason is that ice contracts on melting.

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