Chemistry
The least preferred technique in the disposal of Municipal Solid Waste is

Bricketting
Composting
Incineration
Land filling

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

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