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Q.

Suppose two elements X and Y combine to form two compounds XY2 and X2Y3 when 0.05 mole of XY2 weighs 5 g while 3.011 x 1023 molecules of X2Y3. weighs 85 g. The atomic masses of X and f are respectively :

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a

20,30

b

30,40

c

40,30

d

80,60

answer is C.

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Detailed Solution

Mot. wt. of XY2=50.05=100
Mol. wt. of X2Y3=853.011×1023×NA=170
Let molar mass of x and Y are a and b respectively
∴ a + 2b = 100
2a +3b =170
a=40.
b=30

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