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Q.

Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weight 10 g and 0.05 mole of X3Y  weight 9 g. the atomic weight of X and Y are

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a

30,20

b

40,30

c

60,40

d

20,30

answer is B.

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Detailed Solution

For XY2 n=WM0.1=10X+2Y=X+2Y=100For X3Y2 n=WM0.05=93X+2Y=3X+2Y=180Form (i) and (ii)2X=80X=40 and 2Y=100−40=60
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