Short Answer Type

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Specify the oxidation numbers of the metals in the following coordination entities:
 [Co(H2O)(CN)(en)2]2+


Calculation of oxidation number of the metal in the coordination entities:
Co =x
H2O =0
CN=  (-1)
en =0

thus oxidation number is:

x + 0 + (– 1) + 0 = +2

∴  x = 3

oxidation no. of Co = 3

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

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Explain the bonding in coordination compounds in terms of Werner’s postulates.
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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+?

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

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[Fe(CN)6]4- and [Fe(H2O)6]2+ are of different colours in dilute solutions. Why?
287 Views

Long Answer Type

Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic. 
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What is meant by unidentate, didentate and ambidendate ligands ? Give two examples of each. 
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