Chemistry
The advantage of detergents over soaps is

Detergents could not give much lather
Detergents give lather even with hard water
Detergents are soluble in water
Soaps give lather with only soft water

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

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

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