Redox Reactions And Electrochemistry Ques 749
Question: Oxidation number of Fe in $ {{[Fe{{(CN)}_6}]}^{-3}}, $ $ {{[Fe{{(CN)}_6}]}^{-4}},,{{[Fe(SCN)]}^{+2}} $ and $ {{[Fe{{(H_2O)}_6}]}^{+3}} $ respectively would be-
Options:
A) +3, +2, +3 and +3
B) +3, +3, +3 and +3
C) +3, +2, +2 and +2
D) +2, +2, +2 and +2
Show Answer
Answer:
Correct Answer: A
Solution:
[a] O.N. of Fein: $ {{[ Fe{{( CN )}_6} ]}^{3-}}\Rightarrow x-6=-3\Rightarrow x=+3 $
$ {{[ Fe( SCN ) ]}^{2+}}\Rightarrow x-1=+2\Rightarrow x=+3 $
$ {{[ Fe{{( H_2O )}_6} ]}^{3+}}\Rightarrow x+0=+3\Rightarrow x=+3 $ Thus, option [a] is correct.
