Chemistry
Sullage water is –

Waste water released from kitchen
Waste water released from hospitals
Waste water released from toilets
Waste water released from factories

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

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

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