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Question

Match the column I with column II and mark the appropriate choice.

Column I
( Compound )
Coloumn II
(Oxidation state of Fe)
( A )K3[(Fe(OH)6](i)+8/3
( B )K2[FeO4](ii)+2
( C )FeSO4,(NH4)2SO46H2O(iii)+3
( D)Fe3O4(iv)+6

A
(A)(iii),(B)(i),(C)(ii),(D)(iv)
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B
(A)(iii),(B)(iv),(C)(ii),(D)(i)
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C
(A)(i),(B)(iii),(C)(ii),(D)(iv)
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D
(A)(iv),(B)(ii),(C)(i),(D)(iii)
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Solution

The correct option is B (A)(iii),(B)(iv),(C)(ii),(D)(i)
Let the oxidation number of Fe be x.
Oxidation number of the ligands are: H=K=+1, O=2,OH=2+1=1,NH4=+1,SO4=2,H2O=0
(A) K3[Fe(OH)6]: 3×1+x+6×(1)=0
x+36=0 or x=+3 =(iii)
(B) K2[FeO4]: 2×1+x+4×(2)=0
x+28=0 or x=+6=(iv)
(C) FeSO4.(NH4)2SO4.6H2O: x+(2)+2×1+(2)+6×0=0=(ii)
x2+22+0=0 or x=+2
(D) Fe3O4: 3×x+4×(2)=0
3x8=0 or x=+8/3 $=(i)$
(A)(iii),(B)(iv),(C)(ii),(D)(i)

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