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Q.

The element A and B combine together to give two compounds  A2B3 and AB2. The weight of 0.2 mole of A2B3 is 26gm. The weight of 0.3mole of AB2 is 24gm. Then the atomic weight of A and B respectively are ____?

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a

15,20

b

20,25

c

20,30

d

25,30

answer is C.

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Detailed Solution

Mole=weightGMw Mwt   of A2B3=260.2=130  Mwt of AB2=240.3=80 2A +3B = 130 A + 2B = 80 on solving. A At.wt = 20 B At.wt = 30
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