Point out incorrect stability order from Chemistry Coordination

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Consider the following reaction and statements:

[Co(NH3)4Br2]+ + Br-    [Co(NH3)3Br3] + NH3

(I) Two isomers are produced if the reactant complex ion is a cis-isomer
(II) Two isomers are produced if the reactant complex ion is a trans-isomer
(III) Only one isomer is produced if the reactant complex ion is a trans-isomer
(IV) Only one isomer is produced if the reactant complex ion is a cis – isomer

The correct statements are

  • (II) and (IV)

  • (I) and (II)

  • (I) and (III)

  • (III) and (IV)


52.

The trans-alkenes are formed by the reduction of alkynes with

  • Sn - HCl

  • H2 – Pd/C, BaSO4

  • NaBH4

  • Na/liq. NH3


53.

The oxidation states of Cr in [Cr(H2O)6]Cl3,[Cr(C6H6)2], and K2[Cr(CN)2 (O)2(O2)(NH3)] respectively are :

  • +3, +2, and +4

  • +3, 0, and +6

  • +3, 0, and +4

  • +3, +4, and +6


54.

Amongst [Ni(H2O)6]2+; [Ni(PPh3)2Cl2]; [Ni(CO)4] and [Ni(CN4)]2- the paramagnetic species are

  • [NiCl4]2-; [Ni(H2O)6]2+; [Ni(PPh3)2Cl2]

  • [Ni(CO)4]; [Ni(PPh3)2Cl2]; [NiCl4]2-

  • [Ni(CN4)]2- ; [Ni(H2O)6]2+ ; [NiCl4]2-

  • [Ni(PPh3)2Cl2] ; [Ni(CO)4]; [Ni(CN4)]2-


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55.

Among the following metal carbonyls, the C- O bond order is lowest in

  • [Mn(CO)6]+

  • [Fe(CO)5]

  • [Cr(CO)6]

  • [V(CO)6]-


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56.

Point out incorrect stability order

  • [Cu(NH3)4]2+ < [Cu(en)2]2+ < [Cu(trien)]2+

  • [Fe(H2O)6]3+ < [Fe(NO2)6]3- < [Fe(NH3)6]3+

  • [Co(H2O)6]3+ < [Rh(H2O)6]3+ < [Ir(H2O6]3+

  • [Cr(NH3)6]+ < [Cr(NH3)6]2+ < [Cr(NH3)6]3+


B.

[Fe(H2O)6]3+ < [Fe(NO2)6]3- < [Fe(NH3)6]3+

Increasing stability order

a. [Cu(NH3)4]2+ < [Cu(en)2]2+ < [Cu(trien)]2+2

Their formation of entropy increases in the same order due to denticity of ligand increases.

b. [Fe(H2O)6]3+ < [Fe(NO2)6]3- < [Fe(NH3)6]3+

NO2- is stronger ligand than NH3.

 The correct order of stability is

[Fe(H2O)]3+ < [Fe(NH3)6]3+ < [Fe(NO2)6]3-

c. [Co(H2O)6]3+ < [Rh(H2O)6]3+ < [Ir(H2O)6]3+

Zeff value increases from CO3+ to Ir3+.

d. [Cr(NH3)6]1+ < [Cr(NH3)6]2+ < [Cr(NH3)6]3+.

Oxidation state of Cr atoms increases from +1 to +3.


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57.

Which one of the following complexes is not expected to exhibit isomerism?

  • [Ni(NH3)4 (H2O)2]2+

  • [Pt(NH3)2Cl2]

  • [Ni(NH3)2Cl2]

  • [Ni(em)3]2+


58.

Which of the following carbonyls will have the strongest C-O bond?

  • Mn(CO)6+

  • Cr(CO)6

  • V(CO)6-

  • Fe(CO)5


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59.

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+

  • [ZN(NH3)6]2+


60.

Amongst Ni(CO)4, [Ni(CN)4]2- and [NiCl42-]

  • Ni(CO)4 and [NiCl42-] are diamagentic but [Ni(CN)4]2- is paramagnetic.

  • Ni(CO)4 and [Ni(CN)4]2- are diamagnetic but NiCl42- is paramagnetic.

  • NiCl42- and [Ni(CN)4]2- are diamagnetic but Ni(CO)4 is paramagnetic.

  • Ni(CO)4 is diamagnetic but NiCl42- and [Ni(CN)4]2- is paramagnetic.


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