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NEET2003ChemistrySolutionsActual

Assertion : Increasing pressure on pure water decreases its freezing point. Reason : Density of water is minimum at 273 ~K .

Options

  1. AIf both assertion and reason are true and the reason is the correct explanation of the assertion
  2. BIf both assertion and reason are true and the reason is not the correct explanation of the assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true and the reason is not the correct explanation of the assertion

Step-by-step solution

According to Clapeyron-Clausius equation, d T d P = T (V_l-V_s ) H_f Since density of ice is less than that of water, V_s is greater than V_l . In other words, the expression on the right hand side of the above equation is negative. This means that the increase of pressure must lower and decrease of pressure must raise the freezing point.

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