How is a pure substance different from a mixture?

  • A
    Pure substances have variable composition,while mixtures have fixed composition.
  • B
    Pure substances consist of only one type of particles,while mixtures consist of two or more substances mixed in any proportion.
  • C
    Mixtures have fixed melting and boiling points,while pure substances do not.
  • D
    Pure substances are always heterogeneous,while mixtures are always homogeneous.

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