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Q.

An element X forms two oxides. Formula of the first oxide is XO2. The first oxide contains 50% of oxygen. If the second oxide contains 60% of oxygen, the formula of the second oxide is

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a

X2O

b

X2O3

c

X3O2

d

XO3

answer is A.

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Detailed Solution

I – oxide =  XO2      (   Given   50%O=50%X)

⇒At wt of X = 32

II- Oxide :       X : O

Wt      :      0.4  :  0.6

2  :  3

More ratio  =  232   :   316

116  :  316 = 1  :  3

MF  =  XO3

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