which of the following complex ions is expected to absorb visibl

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 Multiple Choice QuestionsMultiple Choice Questions

201.

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]+

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202.

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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203.

Out of TiF62-, CoF63-, Cu2Cl2 and NiCl42- (Z of Ti = 22, Co= 27, Cu = 29, Ni =28) the colourless species are

  • TiF62- and CoF63-

  • Cu2Cl2 and NiCl42-

  • TiF62- and Cu2Cl2

  • TiF62- and Cu2Cl2

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204.

Which of the following compound will exhibit cis-trans (geometrical) isomerism? 

  • 2-butene

  • Butanol

  • 2-butyne

  • 2-butyne

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205.

On the basis of the following Eo values; the strongest oxidising agent is

[Fe(CN)6]4- → [Fe(CN)6]3-] +e- ;
Eo = -0.35 V

Fe2+ → Fe3+  +e-; E = -0.77 V

  • [Fe(CN)6]4-

  • Fe2+

  • Fe3+

  • Fe3+

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206.

Which of the following complexes exhibits the highest paramagnetic behaviour?

Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities

(At. no. ; Ti = 22, V = 23, Fe =26, Co = 27)

  • [V(gly)2 (OH)2 (NH3)2]+

  • [Fe(en)(bpy)(NH3)2]+

  • [CO(OX)2(OH)2]-

  • [CO(OX)2(OH)2]-

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207.

How many stereoisomers does this molecule have? 

CH subscript 3 CH space equals space CHCH subscript 2 straight C asterisk times HBrCH subscript 3

  • 4

  • 6

  • 8

  • 8

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208.

In which of the following coordination entities the magnitude of Δo (CFSE in the octahedral field) will be maximum?

(Atomic number Co = 27)

  • [Co(H2O)6]3+

  • [CO(NH3)6]3+

  • [CO(CN)6]3-

  • [CO(CN)6]3-

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209.

Which of the following will give a pair of enantiomorphs?
(en = NH2CH2CH2NH2)

  • [Co(NH3)Cl2]NO2

  • [Cr(NH3)6]Co(CN)6]

  • [Co(en)2Cl2]Cl

  • [Co(en)2Cl2]Cl


210.

If there is no rotation of plane polarises light by a compound in a specific solvent, thought to by chiral, it may mean that:

  • the compound is certainly a chiral

  • the compound is certainly meso

  • there is no compound in the solvent

  • there is no compound in the solvent


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