In [Ag(CN)2]-, the number of π bonds is from Chemistry C

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 Multiple Choice QuestionsMultiple Choice Questions

271.

The pair in which both species have same magnetic moment (spin only value) is

  • [Cr(H2O)6]2+,[CoCl4]2+

  • [Cr(H2O)6]2+,[Fe(H2O)6]2+

  • [Mn(H2O)6]2+, [Cr(H2O)6]2+

  • [CoCl4]2-, [Fe(H2O)6]2+


272.

Which gives nucleophilic addition most easily :

  • CH3CHO

  • CH3CH2CHO

  • (CH3)2CHCHO

  • HCHO


273.

The colour imparted by Co(II) compounds to glass is

  • green

  • deep-blue

  • yellow

  • red


274.

The number of possible isomers of an octahedral complex[Co(C2O4)2(NH3)2].

 

  • 1

  • 2

  • 3

  • 4


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275.

The ligands in anti-cancer drug cisplatin are

  • NH3, Cl

  • NH3, H2O

  • Cl, H2O

  • NO, Cl


276.

The magnetic moment of K3[Fe(CN)6]  is found to be 1.7 BM .How many unpaired electron (s) is/are present per molecule ?

  • 1

  • 2

  • 3

  • 4


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277.

In [Ag(CN)2]-, the number of π bonds is

  • 2

  • 3

  • 4

  • 6


C.

4

Cyanide is considered, in a broad sense, to be the most potent ligand for many transition metals. The very high affinities of metals for cyanide can be attributed to its negative charge, compactness and ability to engage in π-bonding. The dicyanides [M(CN)2] (M = Cu, Ag, Au) are linear in geometry.

 -CN     2π     1σ, Thus, two cyanide ions have 4π-bonds.


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278.

An aqueous solution of CoCl2 on addition of excess of concentrated HCl turns blue due to formation of

  • [Co(H2O)4Cl2]

  • [Co(H2O)2Cl4]2-

  • [CoCl4]2-

  • [Co(H2O)2Cl2]


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279.

In which of the following pairs both the complexes show optical isomerism?

  • cis-[Cr(C2O4)2Cl2]3-, cis-[Co(NH3)4Cl2]

  • [Co(en)3]Cl3cis-[Co(en)2Cl2]Cl

  • [PtCl(dien)]Cl, [NiCl2Br2]2-

  • [Co(NO3)3(NH3)3], cis-[Pt(en)2Cl2]


280.

The correct order for the wavelength of absorption in the visible region is

  • [Ni(NO2)6]4- < [Ni(NH3)6]2+ < [Ni(H2O)6]2+

  • [Ni(NO2)6]4- < [Ni(H2O)6]2+ < [Ni(NH3)6]2+

  • [Ni(H2O)6]2+ < [Ni(NH3)6]2+ < [Ni(NO2)6]4-

  • [Ni(NH3)6]2+ < [Ni(H2O)6]2+ < [Ni(NO2)6]4-


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