Which of the following is the correct sequence of atomic weights of the given elements ? (1) Ni>Co>Fe (2) Fe>Co>Ni (3) Co>Fe>Ni (4) Co>Ni>Fe

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$[N i (C O)_{4}] > [C o (C O)_{4}]^{-} > [F e (C O)_{4}]^{2 -}$ is the correct order with respect to M-C $π$ bond. Where M=Ni, Fe, and Co

[F e (C N)_{6}]^{4 -}, [N i (C N)_{4}]^{2 -}

[N i (C O)_{4}]

F e

C o

N i

18

[C u (N H_{3})_{4}]^{2 +}, [C u (e n)_{3}]^{2 +}, [C u (C N)_{4}]^{3 -}

[F e (C N)_{6}]^{4 -}, [F e (C N)_{6}]^{3 -}, F e (C O)_{6}

[N i (N H_{3})_{6}]^{2 +}, [N i (C N)_{4}]^{2 -}, [N i (C O)_{4}]

[C r (N H_{3})_{6}]^{3 +}, [C r (C O)_{6}]

[C o (N H_{3})_{6}]^{3 +}, [C o C l_{4}]^{2 -}

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