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The law of constant proportions was enunciated by

  • A.Dalton
  • B.Berthelot
  • C.Avogadro
  • D.Proust

Answer: D

The law of constant proportions was enunciated by Joseph Proust in 1799.

It states that a given compound always contains the same elements in the same proportion by mass, whatever its source or method of preparation - water is always 1 part hydrogen to 8 parts oxygen. Dalton's law of multiple proportions came a few years later.

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