Which of the following species act as reducing agent
(A)\([Co(CN)_{6}]^{-4}\)
(B) \([Co(NO_{2})_{6}]^{-4}\)
(C)\([V(CO)_{6}\)]
(D)\([Mn(CO)_{6}\)]

CO Bond length is longest in A) \([Mn(CO)_{6}]^{+}\) B) \([V(CO)_{6}]^{-}\) C) \([Cr(CO)_{6}\) . D) \([Ti(CO)_{6}]^{2-}\)

Which of the following complex is having highest M-C bond order? (1) [Ni(CO)_(4)] (2) [Fe(CO)_(5)] (3) [V(CO)_(6)]^(-) (4) [Mn(CO)_(6)]^(+)

Which of the following complexes are paramagnetic in nature ? [Fe(CN)_(6)]^(3-), [Fe(CN)_6]^(4-) , [CoF_6]^(3-), Ni(CO)_(4) .

The pi acceptor ligands are those which possess vacant pi- orbitals in addition to the lone pairs of electrons Which of the following complex ion has the highest C-O bond length ? (a) [V(CO)_(6)]^(o+) (b) Ni(CO)_(4) (c ) Fe(CO)_(5) (d) [Mn(CO)_(6)]^(o+) .

The pi acceptor ligands are those which possess vacant pi- orbitals in addition to the lone pairs of electrons Which of the following complex// ion has lowest M-C bond order? (a) [V(CO)_(6)]^(o+) (b) Ni(CO)_(4) (c ) Fe(CO)_(5) (d) [Mn(CO)_(6)]^(o+) .

The pi acceptor ligands are those which possess vacant pi- orbitals in addition to the lone pairs of electrons Which of the following complex// ion has lowest C-O bond order? (a) [V(CO)_(6)]^(o+) (b) Ni(CO)_(4) (c ) Fe(CO)_(5) (d) [Mn(CO)_(6)]^(o+) .

The pi acceptor ligands are those which possess vacant pi- orbitals in addition to the lone pairs of electrons Which of the following complex ion has lowest M-C bond length? (a) [V(CO)_(6)]^(o+) (b) [Mn(CO)_(6)]^(o+) (c ) Ni(CO)_(4) (d) Fe(CO)_(5) .

Which of the following complexes are low spin diamagnetic ? (P) K_(4)[Os(CN)_(6)]" "(Q) [Mo(CO)_(6)] [Mn(CN)_(6)]^(4-) select the correct answer using the codes given below :

Which of the following is more stable ? (1) K_(4)[Fe(CN)_(6)] or K_(3)[Fe(CN)_(6)] (2) [Co(NH_(3))_(6)]^(3+) or [Co(en)_(2)(NH_(3))_(2)]^(3+) (3) [NiCl_(4)]^(2-) or [Ni(CN)_(4)]^(2-)