Discussion
During the combustion of pulverised soil, the oxidation of carbon, nitrogen and sulphur in the organic coaly matter produces :
Answer: A
The products are carbon dioxides, nitrogen oxides and sulphur oxides.
The question, which says 'pulverised soil', clearly means pulverised coal, as the phrase 'organic coaly matter' shows. When coal burns, its carbon is oxidised to carbon dioxide, its organically bound nitrogen to nitrogen oxides (fuel NOx) and its sulphur to sulphur oxides, mainly SO2. This is why coal-fired power plants are major sources of all three.
Copper and zinc are not part of the organic matter of coal; any trace metals end up in the fly ash, not as products of oxidising carbon, nitrogen and sulphur. The options naming copper or zinc oxides do not answer what the question asks.
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