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Law of multiple proportions - class-XI

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Multiple Choice

Among the following pairs of compounds, the one that illustrates the law of multiple proportions is:

  1. $NH _{3}$ and $NCl _{3}$
  2. $H _{2}S$ and $SO _{2}$
  3. $CuO$ and $Cu _{2}O$
  4. $CS _{2}$ and $FeSO _{4}$
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