Chemistry
During fermentation of sugar, the compound which is always formed is :

Ethyl Alcohol
Methyl Alcohol
Ethylene
Acetic Acid

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

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

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