Multiple Choice QuestionsThe pair of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?
Which of the following complex compounds will exhibit highest paramagnetic behaviour ?
At. no. : Ti = 22, Cr = 24, Co = 27, Zn = 30
[Ti(NH3)6]3+
[Cr(NH3)6]3+
[Co(NH3)6]3+
[Co(NH3)6]3+
Number of possible isomers for the complex [Co(en)2Cl2]Cl will be
(en =ethylenediamine)
2
1
3
3
The hybridization involved in complex [Ni(CN)4]2- is (Atomic number of Ni = 28)
dsp2
sp3
d2sp3
d2sp3
Which of the following complex ions is not expected to absorb visible light?
[Ni(CN)4]2-
[Cr(NH3)6]3+
[Fe(H2O)6]2+
[Fe(H2O)6]2+
A.
[Ni(CN)4]2-
For the absorption of visible light, the presence of unpaired d- electrons is the necessity.
a) In [Ni(CN)4]2- , Ni is present as Ni2+
Ni2+ = [Ar] 3d8 4s0
Therefore, [Ni(CN)4]2- = 
(pairing occurs because CN- is a strong field ligand).
Since in [NiCN)4]2-, no unpaired electron is present in d- orbitals, it does not absorb visible light.
(b) In [Cr(NH3)6]3+, [Fe(H2O)6]2+ [Ni(H2O)6]2+ has unpaired electrons such as
[Cr(NH3)6]3+ Cr3+ = Have three unpaired electron
[Fe(H2O)6]2+ Fe2+ = Have four unpaired electrons
[Ni(H2O)6]2+ Ni2+ = Have two unpaired electrons
Crystal field stabilisation energy for high spin d4 octahedral complex is
-1.8 Δo
-1.6 Δo + P
-1.2 Δo
-1.2 Δo
The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to
linkage isomerism
geometrical isomerism
Coordination isomerism
Coordination isomerism
Which one of the following complexes is not expected to exhibit isomerism?
[Ni(NH3)(H2O)2]2+
[Pt(NH3)2Cl2]
[Ni(NH3)2Cl2]
[Ni(NH3)2Cl2]
which of the following does not show optical isomerism? (en = ethylenediamine)
[Co(en)2Cl2]+
[Co(NH3)3Cl3]0
[Co(en)Cl2(NH3)2]+
[Co(en)Cl2(NH3)2]+
which of the following complex ions is expected to absorb visible light?
(At. no.Zn = 30, Sc = 21, Ti = 22, Cr = 24)
[Sc(H2O)(NH3)3]3+
[Ti(en)2(NH3)2]4+
[Cr(NH3)6]3+
[Cr(NH3)6]3+
Switch
