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Among the following compound ions are

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${Na}^{+}$

${SO}_{4}^{- 2}$

${NO}_{3}^{-}$

${PO}_{4}^{- 3}$

answer is C, D, B.

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Detailed Solution

Compound ion is an ion which consists of two or more atoms of different elements to form a single unit.

Ex: ${SO}_{4}^{- 2}$ (Sulphate ion)

It behaves as single unit and is composed of one atom S, and four atoms of Oxygen.

Ex: ${NO}_{3}^{-}$ (Compound ion)

One atom of Nitrogen and three atoms of Oxygen, it behaves as single unit.

Ex: ${PO}_{4}^{- 3}$ (Phosphate ion)

One atom of Phosphorus and four Oxygen atoms, it behaves as single unit.

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