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Experimentally it was found that a metal...

Experimentally it was found that a metal oxide has formula `M_(0.98)O`. Metal M, present as `M^(2+) and M^(3+)` in its oxide. Fraction of the metal which exists as `M^(3+)` would be

A

`5.08%`

B

`7.01%`

C

`4.08%`

D

`6.05%`

Text Solution

Verified by Experts

The correct Answer is:
B
Let the fraction of metal which exists as `M^(3+)` be x.
Then the fraction of metal as `M^(2+)`=(0.98-x)
`therefore` 3x+2(0.98-x)=2
x+1.96=2
x=0.04
`therefore` % of `M^(3+)=0.04/0.98xx100` =4.08%
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