Redox Reactions And Electrochemistry Ques 106

Question: The oxidation number of sulphur in $ H_2S_2O_7 $ and iron in $ K_4Fe{{(CN)}_6} $ is respectively [AIIMS 2000]

Options:

A) + 6 and + 2

B) + 2 and + 2

C) + 8 and + 2

D) + 6 and + 4

Show Answer

Answer:

Correct Answer: A

Solution:

$ \overset{*,}{\mathop{H_2S_2O_7}}, $

$ 2\times (+1)+2\times x+7\times (-2)=0 $

$ +2+2x-14=0 $ $ 2x=14-2=12 $

$ x=\frac{12}{2}=+6forS $

$ K_4\overset{*}{\mathop{Fe}},{{(CN)}_6} $

$ 4\times (+1),x+6\times (-1)=0 $ $ 4+x-6=0 $ $ x=6-4=+2forFe $ .



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