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The substances that are composed of to or more different elements in fixed proportion by mass are called

  • A.Mixture
  • B.Compound
  • C.Element
  • D.None of these

Answer: B

Such a substance is a compound.

Its elements are chemically combined in a fixed ratio by mass - the law of constant proportions - and it has properties quite unlike those of its constituents. A mixture can be in any proportion and keeps the properties of its components.

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