1.

Assuming complete ionization same moles of which of the following compounds will require the least amount of acidified KMnO_(4) for complete oxidation?

Answer»

`FeC_(2)O_(4)`
`Fe(NO_(2))_(2)`
`FeSO_(4)`
`FeSO_(3)`

Solution :`{:(1,Fe^(2+) rarr Fe^(3+)),(,SO_(3)^(2-) rarr SO_(4)^(2-)):} {:(1),(2):}}rArr 3`
`{:(2,Fe^(2+) rarr Fe^(3+)),(,C_(2)O_(4)^(2-) rarr 2CO_(2)):} {:(1),(2):}}rArr 3`
`{:(3,Fe^(2+) rarr Fe^(3+)),(,2NO_(3)^(-) rarr 2NO_(3)^(-)):} {:(1),(4):}}rArr 5`
4. `Fe^(2+) rarr Fe^(3+) 1`
Least NUMBER of ELECTRONS are involved in `FeSO_(4)`


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