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Q)

Of the following sets which one does not contain isoelectronic species ?


( A ) $SO_3^{2-}, CO_3^{2-}, NO_3^-$
( B ) $BO_3^{3-}, CO_3^{2-}, NO_3^-$
( C ) $PO_4^{3-}, SO_4^{2-}, ClO_4^-$
( D ) $CN^-, N_2, C_2^{2-}$

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