Coordination Compounds

Short Answer Type

Advertisement
Zigya App

What will be the correct order for the wavelength of absorption in the visible region for the following:
[Ni (NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6]2+?

The central metal atom is same in all compound. Thus adsorption in the visible reigon depend on the ligand. according to spectrochemical series increasing order of ligand is H2O < NH3 < NO2-. Hence the correct order for wavelength is 
[Ni (NO2)6]4–<[Ni(NH3)6]2+<[Ni(H2O)6]2+.

(i) [Ni– (NO2)6]4– = wavelength of light is 498 nm.
(ii) [Ni(NH3)6]2+= wavelength of light is 475 nm.
(iii) [Ni(H2O)6]2+ = wavelength of light is 500nm.

285 Views
  • Switch
    • Advertisement

    A solution of [Ni (H2O)6]2+ is green but a solution of [Ni(CN)4]2– is colourless. Explain. 

    716 Views
    Answer

    Long Answer Type

    Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic. 
    196 Views
    Answer

    Short Answer Type

    Explain the bonding in coordination compounds in terms of Werner’s postulates.
    206 Views
    Answer
    Specify the oxidation numbers of the metals in the following coordination entities:
     [Co(H2O)(CN)(en)2]2+
    162 Views
    Answer
    Advertisement
    Write the formulas for the following coordination compounds:

    (i) Tetraamine aqua chlorocobalt(III) chloride.
    (ii) Potassium tetrahydroxozincate(II).
    (iii) Potassium trioxalatoaluminate(III).
    (iv) Dichloridobis (ethane-1, 2-diamine) cobalt(III) chloride.
    (v) Tetracarbonyl nickel (0)
    600 Views
    Answer

    Out of the following two coordination entities which is chiral (optically active)?
    (a)    cis-[CrCl2(ox)2]3+
    (b)    [trans-[CrCl2 (ox)2]3–

    450 Views
    Answer
    Write the IUPAC names of the following coordination compounds:

    (i) [Pt(NH3)2Cl(NO2)]
    (ii) K    3[Cr(C2O4)3]            
    (iii) [CoCl    2(en)2]Cl
    (iv) [Co(NH    3)5(CO3)]Cl          
     (v) Hg[Co(SCN)    4]
    1875 Views
    Answer
    [Fe(CN)6]4- and [Fe(H2O)6]2+ are of different colours in dilute solutions. Why?
    287 Views
    Answer
    Advertisement
    <

    Long Answer Type

    What is meant by unidentate, didentate and ambidendate ligands ? Give two examples of each. 
    296 Views
    Answer
    Advertisement