CSIR-NET CHEMICAL SCIENCES | Inner transition elements

Inner transition elements: spectral and magnetic properties, redox chemistry, analytical applications.

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  2 2 2 2 1   1 2 2 3 3 2

1.The least basic among the following is:

(a) Al (OH)3

(b) La (OH)3

(c) Ce (OH)3

(d) Lu (OH)3

 

2.The pair of lanthanides with the highest third-ionization energy is:

(a) Eu, Gd

(b) Eu, Yb

(c) Dy, Yb

(d) Lu, Yb

 

3.The lanthanide(III) ion having the highest partition coefficient between tri-n-butylphosphate and concentrated HNO3 is:

(a) La(III)

(b) Eu(III)

(c) Nd(III)

(d) Lu(III)

 

4.Consider the ions Eu(III), Gd(III), Sm(II) and Lu(III). The observed and calculated magnetic moment values are closest for the pair

(1) Gd(III), Lu(III)

(b) Eu(III), Lu(III)

(c) Sm(III), Gd(III)

(d) Sm(III), Eu(III)

 

5.Which one of the following shows the highest solubility in hot concentrated aqueous NaOH?

 (1) La(OH)3

(b) Nd(OH)3

(c) Sm(OH)3

(d) Lu(OH)3.

 

6.Hindered β – diketonates like dpmH (dpmH = dipivaloylmethane) are used for the separation of lanthanidesbecause complexes formed with dpmH can be separated by

(a) Gel permeantion chromatography

(b) Gas chromatography

(c) Gel filtration chromatography

(d) Ion exchange chromatography

 

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