Which of the following complexes exhibits the highest paramagnet

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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+

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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]-


C.

[CO(OX)2(OH)2]-

Greater is the number of unpaired electrons, larger is the paramagnetism.
[V(gly)2(OH)2(NH3)2]+
V23 = [Ar] 4s2, 3d2

Oxidation state of V in [[V(gly)2(OH)2(NH3)2]+ is
x + (-1) x 2 + (-1) x 2 + (0) x 2 = +1
x=+5
V5+ = [Ar]3d0
[Fe(en)(bby)(NH3)2]2+
x + (0) + (0) + (0) x 2 = +2
x = +2

Fe2+ = [Ar] 3d6

But en , bby and NH3 all are strong field ligands, so pairing occurs, thus no unpaired electrons.
[Co(OX)2 (OH)2]- is 
Oxidation state of Co in [Co(OX)2(OH)2]- is 
x + (-2) x 2 + (-1) x 2 = -1
x-6 = -1
x = +5
Co5+ = [Ar]3d4
[Ti(NH3)6]3+ is +3, thus it contains 1 unpaired electron.

Hence, [Co(OX)2(OH)2]- has highest paramagnetic behaviour.
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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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