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Question

The oxidation number of sulphur in H2S2O7 and iron inK4Fe(CN)6 is respectively


A

+ 6 and + 2

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B

+ 2 and + 2

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C

+ 8 and + 2

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D

+ 6 and + 4

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Solution

The correct option is A

+ 6 and + 2


H2S2O7

2×(+1)+2× x +7x(-2)=0

+2+2x-14=0

2x =14 -2=12

x =122=+6 for s

K4Fe(CN)6

4×x +6×(-1) =-4

x =6-4 =+2 for Fe


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