Balance the following equation by oxidation number method.
(i) The skeleton equation along with oxidation number of each atom is
+3 -1 +1 -2 +2-1 +1-1 0
FeCl3 + H2S FeCl2 + HCl + S
(Fe = +3) (S = 2) (Fe = +2) (S =0)
(ii) Noting the change on O. N. of above atoms
Increase S = -2 to 0 i.e. 2
Decrease Fe = +3 to +2 i.e. 1
(iii) Equalise the increase/decrease in O.N. by multiplying FeCl3 by 2.
(iv) On counting and balancing atoms on both the sides, we get the balanced equation.
Balance the following chemical equation by oxidation number method:
in acidic medium.