Chemistry
What are the major pollutants of cigarette smoke?

Carbon monoxide and nicotine
Carbon monoxide and benzene
Carbon monoxide and dioxin
Dioxin and benzene

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Chemistry
Aqua regia is a 1 : 3 mixture, by volume, of

Conc. nitric acid and conc. hydrochloric acid
Conc. hydrochloric acid and conc. nitric acid
Conc. sulphuric acid and conc. nitric acid
Conc. nitric acid and conc. sulphuric acid

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