Transition elements

Transition elements and coordination compounds: structure, bonding theories, spectral and magnetic properties, reaction mechanisms.

YEAR JUN-2016 DEC-2015 JUN-2015 DEC-2014 JUN-2014 DEC-2013 JUN-2013 DEC-2012 JUN-2012 DEC-2011 JUN-2011
No.of questions appeared 4  8 3 7 10 6 5 6 1 7 10

1.The number of microstates for d5 electron configuration is:

(a) 21×63

(b) 14×63

(c) 7×62

(d) 28×63

 

2.The number of possible isomers of [Ru(PPh3)2(acac)2] (acac=acetylacetonate) is:

(1) 2

(b) 3

(c) 4

(d) 5

 

3.The correct spinel structure of Co3O4 is:

spinals-cobalt-csir-net-gate-chemical-sciences-82-dec-2012

 

4.In the solid state, the CuCl53-ion has two types of bonds. These are

(1) Three long and two short

(b) Two long and three short

(c) One long and four short

(d) Four long and one short

 

5.The platinum complex of NH3 and Cl ligands is an anti-tumour agent. The correct isomeric formula of the complex and its precursor are

(1) cis-Pt(NH3)2Cl2 and PtCl42-

(b) trans-Pt(NH3)2Cl2 and PtCl42-

(c) cis-Pt(NH3)2Cl2 and Pt(NH3)42+

(d) trans-Pt(NH3)2Cl2 and Pt(NH3)42-

 

6.Successive addition of NaCl, H3PO4, KSCN and NaF to a solutin of Fe(NO3)3.9H2O gives yellow, colourless, red and again colorless solutions due to the respective formation of:

(1) [Fe (H2O)5Cl]2+ , [Fe (H2O)5 (PO4)] , [Fe (H2O)5 (SCN)]2+, [Fe (H2O)5 F]2+

(b) [Fe (H2O)5Cl(OH)]+ , [Fe (H2O)5 (PO4)] , [Fe (H2O)5 (SCN)]2-, [Fe (H2O)5 F]2+

(c) [Fe (H2O)5Cl]2+, [Fe (H2O)6 ]3+, [Fe (H2O)5 (SCN)]2+, [Fe (H2O)5 F]2+

(d) [Fe (H2O)5Cl]2+ , [Fe (H2O)5 (PO4)] , [Fe (H2O)5 (SCN)]2+, [Fe (H2O)4(SCN)F]+

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