In presence of impurities, the melting point of solid _____________.

increases

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does not change

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changes according to the weather

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decreases

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Solution

The correct option is D decreases
When we add impurities to the pure substance, the melting point of solid is decreased because impurities weakens the lattice structure of solids due to which it become less stable and melts before its original melting point. This is called melting point depression.

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Similar questions

Q. Which of the following statement(s) is/are correct?
(a) Non-volatile impurities decrease the boiling point of the substance.
(b) Addition of impurities to a solid decrease the melting point of solid.
(c) Lower the boiling point of a liquid, higher is its rate of evaporation.

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In presence of impurities, the melting point of solid _____________.

The correct option is D decreasesWhen we add impurities to the pure substance, the melting point of solid is decreased because impurities weakens the lattice structure of solids due to which it become less stable and melts before its original melting point. This is called melting point depression.

The correct option is D decreases
When we add impurities to the pure substance, the melting point of solid is decreased because impurities weakens the lattice structure of solids due to which it become less stable and melts before its original melting point. This is called melting point depression.