Q.

Two metallic oxides contain 27.6% and 30% oxygen respectively. If the formula of first oxide is M3O4 that of second will be

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a

M2O3

 

b

MO2

c

M2O5

d

MO

answer is D.

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Detailed Solution

Metallic content M in oxide:

100-27.6=72.4%

100-30=70%

72.4% of M = 3 mol of M

=3/ 72.4 x 70

=2.90 mol of M

Similarly,

27.6% of O = 4 mol of O

=4/27.6 x 30

=4.3 mol of O

2.90:4.342:3

Hence, the correct option is M2O3 D.

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