Chemistry
Baryllium Sulphate is less soluble in water due to

High inflammable energy
Low Energy of dissociation
Low inflammable energy
Lonic band

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

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

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