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Which of the following are isoelectronic and isostructural ? $NO_3^{-},CO_3^{2-}, ClO_3^{-},SO_3$

$(A)\;NO_3^{-} \\ (B)\;CO_3^{2-} \\(C)\;ClO_3^{-}, CO_3^{2-} \\(D)\;CO_3^{2-},SO_3 $

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A)
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Both $CO_3^{2-}$ and $NO_3^{-}$ have same number of electrons (ie) isoelectronic .
They both have 32 electrons.
Both of these involve same type of hybridisation so they are isostructural .
Both have $SP^2$ hybridisation and so are planar.
Hence A is the correct answer.
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