Nitrogen, $$\(\mathrm{N}_{2}\)$$, is generally an unreactive molecule but it does react under certain conditions. $$\(\mathrm{N}_{2}\)$$ can react with oxygen in an internal combustion engine to form a mixture of NO and $$\(\mathrm{NO}_{2}\)$$. Fig. 3.1 shows a reaction scheme involving $$\(\mathrm{N}_{2}\)$$. (i) Write an equation to show the formation of a mixture of NO and $$\(\mathrm{NO}_{2}\)$$ in reaction 1. ................................................................................................................................. (ii) Give the formulae of the products of reaction 2 . ................................................................................................................................. (iii) State one environmental consequence of reaction 3. .................................................................................................................................

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