Active mass of 6% solution of compound X is 2. Molecular weight of X would be :

6

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30

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60

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90

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Solution

The correct option is B $30$
Active mass of 2 means 2 moles of X in one litre solution.
$∵ 100 m l s o l u t i o n c o n t a i n s 6 g m o f X ∴ 1000 m l s o l u t i o n c o n t a i n s \frac{6 \times 1000}{100} = 60 g m 2 m o l e s = 60 g m X 1 m o l e = 30 g m X H e n c e m o l e c u l a r w e i g h t o f X i s 30.$

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