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Question

In the balanced equation
FeS+MnO4HFe3++SO24+Mn2+
the stoichiometric coefficients of FeS ad MnO4 are the ratio:

A
8 : 5
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B
5 : 8
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C
9 : 5
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D
5 : 9
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Solution

The correct option is D 5 : 9
given :
solution :in figure 1 the Fe and S are performing oxidation and Mn is performing reduction
so total increase in Oxidation state = 1+8=9.....(1) (Fe went from +2 to +3 , S went from -2 to +8)
so total decrease in Oxidation State =5........(2)
for balancing 1 and 2
we have to multiply (1 )by 5 and (2) by 9
so they are in the ratio of 5:9
hence , the correct opt : D


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