Why mixture does'nt have fixed boiling or melting point? give reason

1.	Why mixture does'nt have fixed boiling or melting point? give reason
Answer» Mixture CONTAIN different types of SUBSTANCES in different compositions. these substance may have different MELTING andboiling point hence the melting and boiling point of a mixture cannot be FIXED. ... However there are also IMPURITIES can lowers the melting and boiling point during heating.

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