Effects of oxidation

What are the effects of oxides of oxides of sulphur and nitrogen on the atmosphere?

Give three harmful effects of oxides of sulphur.

Which of the following are the harmful effects of nitrogen oxide? It retards the rate of photosynthesis. It causes respiratory disease in children. It is toxic to living tissues.

Given an example to show the effect of concentration of nitric acid on the formation of oxidation product.

50 g of ZnS are strongly heated in air to effect partial oxidation and the resultant mass weighed 44 g . What is the ratio of ZnO to ZnS in the resultant mixture :