1.

The composition of a sample of wrustite is `Fe_(0.93)O_(1.00)`.Percentage of iron present in the form of iron (III) is nearlyA. 85B. 15C. `7.00`D. `93.00`

Answer» Correct Answer - 2
Let, the sample contains 93 Iron ions and 100 oxide ions.
Total negative charge on oxide ions`=100xx-2=-200`
No. of `Fe^(+3)`ions=x
No. of `Fe^(+2)` iron ions =93-x
Total positive charge `=x(+3)+(93-x)(+2)`
Numarically +ve charge and -ve charge
are equal `therefore 3x+(93-x)2=200 therefore x=14`
% of `Fe^(+3)=(14)/(93)xx100=15.05%`


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