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Q.

An isostere is

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a

${CO}_{2}, N_{2} O, {NO}_{3}^{-}$

b

${NO}_{2}^{-} and O_{3}$

c

${ClO}_{4}^{-} and {OCN}^{-}$

d

${NO}_{2}^{-} and {PO}_{4}^{3 -}$

answer is A.

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Detailed Solution

Isostere are atoms, molecules, or ions of similar size containing the same number of atoms and valence electrons

${NO}_{2}^{-}$ and O₃ are isostere. The number of atoms in these (= 3) and number of electrons (24) are same.

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