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+
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+
D.
[Cr(NH3)6]3+
only those transition metal complexes are expected to absorb visible light, in which d-subshell is incomplete (ie, has unpaired electron) and excitation of an electron from a lower energy orbital to higher energy orbital is possible.
a) In [Sc(H2O)(NH3)3]3+ Sc is present in Sc3+ = [Ar]3d0,4s0
since in this complex excitation of the electron is not possible, it will not absorb visible light.
b) In [Ti(en)2(NH3)2]4+,Ti is present as Ti4+.
Ti4+ = [Ar] 3d0,4s0
Hence it will not absorb visible light.
c) In [Cr(NH3)6]3+ ,Cr is present as Cr3+
Cr3+ = [Ar]3d3,4s0
Since this complex has three unpaired electrons, excitation of electrons is possible and thus, it is expected that this complex will absorb visible light.
d) In [Zn(NH3)6]2+, Zn is present Zn2+
Zn2+ = [Ar] 3d10, 4s0
Hence, this complex will not absorb visible light.
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