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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2000
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Q)

$d\pi-p\pi$ bond present in :


( A ) $NO{_2}^{-}$
( B ) $CO{_3}^{2-}$
( C ) $NO{_3}^{-}$
( D ) $PO{_4}^{-3}$

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