Essential Chemistry for IGCSE - Particles And Purification (Section 7 - No. 33)
How do impurities affect the melting point of a substance?
Impurities increase the melting point.
Impurities have no effect on the melting point.
Impurities lower the melting point.
Impurities make the melting point range very narrow.
Explanation
Impurities depress the melting point.
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