On  adding  NaOH  to  ammonium  sulphate,  a  colourless  gas  with  pungent  odour  is evolved, which forms a blue-coloured complex with Cu²⁺ ion. Identify the gas.

When a co-ordination compound CrCl₃.6H₂O is mixed with AgNO₃, 2 moles of AgCl are precipitated per mole of the compound. Write
(i)Structural formula of the complex.
(ii)IUPAC name of the complex.

(a) For the complex [Fe(CN)₆]^3–, write the hybridization type, magnetic character and spin nature of the complex. (At. number : Fe = 26).
(b) Draw one of the geometrical isomers of the complex [Pt(en)₂Cl₂]²⁺ which is optically active.

When coordination compound CoCl₃.6NH₃ is mixed with AgNO₃, 3molesof AgCl is precipitated per mole of the compound. write
i) Structural formula of the complex
ii) IUPAC name of the complex

a) For the complex [Fe(H₂O)₆]³⁺, write the hybridization,magnetic character and spin of the complex.(At.number: Fe=26).

b) Draw one of the geometrical isomers of the complex [Pt(en)₂Cl₂]²⁺ which is optically inactive.

Write the state of hybridization, the shape and the magnetic behaviour of the following complex entities:

(i) [Cr (NH₃)₄ Cl₂] Cl

(ii) [Co (en) ₃] Cl₃

317.

Identify the chiral molecule in the following pair:

(i) Write the IUPAC name of the complex [Cr(NH₃)₄Cl₂]Cl.
(ii) What type of isomerism is exhibited by the complex [Co(en)₃]³⁺?
(en = ethane-1,2-diamine)
(iii) Why is [NiCl₄]²⁻ paramagnetic but [Ni(CO)₄] is diamagnetic?
(At. nos. : Cr = 24, Co = 27, Ni = 28)

What type of isomerism is shown by the complex [Co(NH₃)₆] [Cr(CN)₆]?

Why a solution of [Ni(H₂O)₆]²⁺ is green while a solution of [Ni(CN)₄]^2– is colourless? (At. no. of Ni = 28)