Poll Results
18.75%(a) a mixture of ferric oxide and sulphur dioxide. ( 3 voters )
18.75%(b) a mixture of ferrous oxide and sulphur trioxide. ( 3 voters )
50%(c) a mixture of ferric , oxide sulphur dioxide and sulphur trioxide. ( 8 voters )
12.5%(d) a mixture of ferrous oxide, sulphur dioxide and sulphur trioxide. ( 2 voters )
Based On 16 Votes
(c) a mixture of ferric , oxide sulphur dioxide and sulphur trioxide.