Give the names of the elements present in the following compounds:

(a) Quick lime

(b) Hydrogen bromide

(c) Baking powder

(d) Potassium sulphate

(a) Quick lime: Quick lime is calcium oxide (CaO) and the elements present are calcium and oxygen.

(b) Hydrogen bromide: Hydrogen bromide (HBr) consists of elements hydrogen and bromine.

(c) Baking powder: Baking powder or sodium bicarbonate (NaHCo₃) consists of elements sodium, hydrogen, carbon and oxygen.

(d) Potassium sulphate: Potassium sulphate (K₂SO₄) consists of elements potassium, sulphur and oxygen.