WAEC - Chemistry (2000 - No. 26)
In which of the following is the oxidation number of sulphur equal to -2?
S8
H2S
SO 2
SO 3 2-
Maelezo
Calculating the Oxidation number of all the options, B is the correct answer.
Hydrogen has oxidation state of +1 in that compound H2S equated to 0.
i.e H2S = 0
2H + S = 0
2(+1) + S = 0
+2 + S = 0
S = 0 -2
S = - 2. - Option B