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Impurity Defect

If an impurit...

Question

If an impurity is present in a crystalline solid, then:

A

Melting point increases

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B

Melting point decreases

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C

Melting point does not change

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D

Can't be predicted

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Solution

The correct option is B Melting point decreases
Adding impurities to crystalline solid causes the lowering of the melting point. The process is called depression in melting point.
This occurs because the presence of impurities weakens the lattice making it less stable.

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