Question

Whose Chemical Formulae..

Answer 1

1.Barium Chloride
2.Aluminium Sulphate
3.Sodium Bicarbonate
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Answer 2

Very easy! The first compound is Barium Chloride. Ba has a valency of +2 and chlorine has a valency of -1. Transposing the valencies we get BaCl2.
The second one is aluminum sulphate. Also has valency +3 and sulphate radical has valency -2. The compound is Al2(SO4)3. The third one is sodium bicarbonate. NaHCO3. Na has valency of +1 and bicarbonate radical has valency of -1.