Multiple Choice QuestionsWhich one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
[Ni(NH3)6]2+
[Zn(NH3)6]2+
[Cr(NH3)6]3+
[Cr(NH3)6]3+
Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni (II).Which of the following statements is not true?
Red Complex has a square planar geometry
Complex has symmetrical H- bonding
Red complex has a tetrahedral geometry
Red complex has a tetrahedral geometry
Low spin complex of d6 -cation in an octahedral field will have the following energy
(Δo = Crystal field splitting energy in an octahedral field,
P= electron pairing energy)
The complexes [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6] are the examples of which type of which type of isomerism?
Ionisation isomerism
Coordination isomerism
Geometrical isomerism
Geometrical isomerism
The d- electron configurations of Cr3+, Mn2+ , Fe2+, and Co2+ are d4 ,d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
(At. no. Cr = 24, Mn = 25, Fe =26, Co = 27)
[Fe(H2O)6]2+
[Co(H2O)6]2+
[Cr(H2O)6]2+
[Cr(H2O)6]2+
Of the following complex ions, which is diamagnetic in nature?
[Ni(CN)4]2-
[CuCl4]2-
[CoF6]3-
[CoF6]3-
The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is
9
6
7
7
The name of complex ion, [Fe(CN)6]3- is
hexacyanoiron (III) ion
hexacyanitoferrate (III) ion
tricyanoferrate (III) ion
tricyanoferrate (III) ion
Which of the following carbonyl will have the strongest C- O bond?
(Mn(CO)6+
Cr(CO)6
V (CO)6-
V (CO)6-
A.
(Mn(CO)6+
As the positive charge on the central metal atom increase, the less readily the metal can donate electron density into the anti - bonding pi-orbitals of CO ligand to weaken the C-O bond. Hence, the C-O bond would be strongest in Mn(CO)6+.
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