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NEET2016ChemistrySome Basic Concepts of ChemistryActual

Suppose the elements X and Y combine to form two compounds X Y 2 and X 3 Y 2 . When 0 . 1   mole of X Y 2 weighs 10   g and 0 . 05   mole of X 3 Y 2 weighs 9   g , the atomic weights of X and Y are

Options

  1. A40 ,   30
  2. B60 ,   40
  3. C20 ,   30
  4. D30 ,   20

Correct answer

A. 40 ,   30

Step-by-step solution

For X Y 2 , ∵ 0.1   m o l e   of   X Y 2 = 10   g ∴ 1   m o l e   of   X Y 2 = 100   g and X + 2 Y = 100 ...(i) For X 3 Y 2 , ∵ 0.05   m o l e   of   X 3 Y 2 = 9   g ∴ 1   m o l e   of   X 3 Y 2 = 180   g and 3 X + 2 Y = 1 8 0 ...(ii) On solving, X =   40 and Y = 30 .

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