Give the names of the elements present in the following compounds:
$(a)$ Quick lime
$(b)$ Hydrogen bromide
$(c)$ Baking powder
$(d)$ Potassium sulphate

(N/A) Quick lime is Calcium oxide $(CaO)$. The elements present are Calcium $(Ca)$ and Oxygen $(O)$.
$(b)$ Hydrogen bromide is $(HBr)$. The elements present are Hydrogen $(H)$ and Bromine $(Br)$.
$(c)$ Baking powder is Sodium hydrogen carbonate $(NaHCO_3)$. The elements present are Sodium $(Na)$,Hydrogen $(H)$,Carbon $(C)$,and Oxygen $(O)$.
$(d)$ Potassium sulphate is $(K_2SO_4)$. The elements present are Potassium $(K)$,Sulphur $(S)$,and Oxygen $(O)$.