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Suppose the elements X and Y combine to ...

Suppose the elements X and Y combine to form two compounds `XY_(2)` and `X_(3) Y_(2)` . When 0.1 mole of `XY_(2)` weighs 10 g and 0.05 mole of `X_(3) Y_(2)` weighs 9 g , the atomic weights of X and Y are -

A

30 , 20

B

40 , 30

C

60 , 40

D

20 , 30

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