Q21 of 35 Page 1

A metal ion Mn+ having d4 valence electronic configuration combines with three bidentate ligands to form a complex compound. Assuming Δ0 > P:

(i) Write the electronic configuration of d4 ion.


(ii) What type of hybridisation will Mn+ ion has?


(iii) Name the type of isomerism exhibited by this complex.

(i) If Δ0 > P, pairing of d4 ion will occur in the t2g orbitals and eg orbitals will remain vacant.



Thus, the electronic configuration is t42g e0g


(ii) hybridization is d2sp3 (as there are three didentate ligands to combine)


(iii) As there are three didentate ligands. Hence type is [M(AA)3]. This type of complexes shows optical isomerism.


Note: Optical isomerism is an isomerism in which the optical isomers rotate the plane of polarized light in the opposite direction means he two isomers which are structurally non-superimposable mirror image of each other (they do not possess the plane of symmetry)


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19

Name the type of reaction involved in the formation of the following polymers from their respective monomers

(i) PVC.


(ii) Nylon6.


(iii) PHBV.

 20

Describe the role of

(i) NaCN in the extraction of gold from its ore.


(ii) Cryolite in the extraction of aluminium from pure alumina.


(iii) CO in the purification of Nickel

 22

The magnetic moments of few transition metal ions are given below:























Metal ion



Magnetic moment(BM)



Sc3+



0.00



Cr2+



4.90



Ni2+



2.84



Ti3+



1.73



(at no. Sc = 21, Ti =22, Cr = 24, Ni = 28)


Which of the given metal ions :


(i) has the maximum number of unpaired electrons?


(ii) forms colourless aqueous solution?


(iii) exhibits the most stable +3 oxidation state?

 22

Consider the standard electrode potential values (M2+ / M) of the elements of the first transition series.


Explain:


(i) Eo value for copper is positive.


(ii) Eo value of Mn is more negative as expected from the trend.


(iii) Cr2+ is a stronger reducing agent than Fe2+