1.

Iron forms a sulphide with the formula `Fe_(7)S_(8)`. Iron exist in both +2 and +3 oxidatioin states. The ratio of Fe(II) atoms to Fe(III) atoms is:A. `3:4`B. `4:3`C. `2:5`D. `5:2`

Answer» Correct Answer - D
Let `Fe^(+2)="x moles"`
then `Fe^(+3)=(7-x)" moles"`
`(x)(+2)+(7-x)(+3)+8(-2)=0`
x= 5


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