Pick out the polyatomic anions from the following and write the formula.
a) Chloride ion b) Fluoride ion
c) Phosphate ion d) Sulphate ion

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Solution

Polyatomic ions are the charged species of ions that are formed from two or more atoms of same or different element and are held together by covalent bonding.
(a) Chloride ion $C l$ : It is a monoatomic anion
(b) Fluoride ion $F^{-}$ : It is a monoatomic anion
(c) Phosphate ion $P O_{4}^{3} -$ : It is a polyatomic anion
(d) Sulphate ion $S O_{4}^{2} -$ : It is a polyatomic anion

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