Which of the following statements is correct

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Decrease of pressure decreases the B.P. of the liquid

Sharp M.P. is the criteria of a pure organic solid

Impurity in liquid elevates the B.P. of the liquid

Impurity in solid decreases the M.P. of the solid

answer is A, B, C, D.

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Detailed Solution

Crystalline organic compounds (Pure and Nonionic) have a very sharp and characteristic melting point of 0.5 to 1⁰C range. Even if there is a small amount of impurity in the mixture it would result in depression of the melting point and an increase in the melting point range.

The boiling point of a liquid can be increased by adding impurities in the liquid. This occurs because the presence of impurities decreases the number of molecules available to become vaporized during boiling.

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