Coordination Compounds

Coordination Compounds
Class:XII / Unit:9

1. A ligand can also be regarded as

Bronsted base
Lewis base
Lewis acid
Bronsted acid

2. Among the following metal carbonyls, C—O bond order is lower in

T[V(CO)₆]^–
[Fe(CO)₅]
[Cr(CO)₆]
[Mn(CO)₆]⁺

3. Among the ligands NH3, en, CN– and CO, the correct order of their increasing field strength, is

NH₃ < en < CN^– < CO
CO < NH₃ < en < CN^–
CN^– < NH₃ < CO < en
en < CN^– < NH₃ < CO

4. Among the properties (A) reducing (B) oxidizing (C) complexing, the set of properties shown by CN^– ion towards metal species is:

B,C
A,B
C,A
A,B,C

5. An octahedral complex is formed when hybrid orbitals of the following type are involved

sp³
dsp²
d²sp³
sp³d³

6. Geometrical shapes of the complexes formed by the reaction of Ni²⁺ with Cl^–, CN^– and H₂O, respectively are

octahedral, square planar and octahedral
octahedral, tetrahedral and square planar
tetrahedral, square planar and octahedral
square planar, tetrahedral and octahedral

7. How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca²⁺ ion?

one
six
three
four

8. In Fe(CO)₅, the Fe − C bond posses

σ-character only
π-character only
both σ and π-characters
ionic character

9. The correct statement with respect to the complexes Ni(CO)4 and [Ni(CN)₄]^2– is

have tetrahedral and square planar geometry respectively
both have square planar geometry
both have tetrahedral geometry
nickel is in the same oxidation state in both

10. The IUPAC name for the complex [Co(NO₂)(NH₃)₅]Cl₂ is

pentaammine nitrito-N-cobalt (II) chloride
nitrito-N-pentaamminecobalt (II) chloride
nitrito-N-pentaamminecobalt (III) chloride
pentaammine nitrito-N-cobalt (III) chloride