Write the correct formulae for the following coordination compounds:
(a)    CrCl₃.6H₂O (violet, with 3 chloride ions/unit formula)
(b)    CrCl₃.6H₂O (light green, with 2 chloride ion/unit formula)
(c)    CrCl₃.5H₂O (dark green, with 1 chloride ion/unit formula)

Explain the following terms:
(a) coordination number    
(b) counter ions.

A coordination compound has the formula CoCl₃.4NH₃. It does not liberate ammonia but forms a precipitate with AgNO₃. Write the structure and IUPAC name of the complex compound.

Draw the structure of the following compounds:
(a) cis-[CrCl₂(OX)₂]^3–    (b) [Ni(CN)₄]^2–  
(c) [Fe(CN)₆]^3–               (d) Meridional [CrCl₃(NH₃)₃]⁺
(e) trans-[PtCl₂(en)₂]²⁺.

295.

Write down the IUPAC name of the following complex:

[Cr(NH₃)₂Cl₂(en)]Cl    (en = ethylenediamine)

Write the formula for the following complex:

Pentaamminenitrito-o-Cobalt (III)

Draw the geometrical isomers of complex [Pt(NH₃)₂Cl₂]? 

On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆o < P ?

Write the hybridization and magnetic behaviour of the complex [Ni(CO)₄].

(At.no. of Ni = 28)

Which of the following is a more stable complex and why?

 (i) [Co(NH₃)₆]³⁺

 (ii) [Co(en)3]³⁺