Q1 · June 2021 · 2 marks
The effective magnetic moment (in BM) for a lanthanide \mathrm{f}^{10} ion is approximately
- (a) 10.6
- (b) 9.92
- (c) 9.59
- (d) 7.94 ●●●●●●● LANTHANIDES AND ACTINIDES
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Answer: (a)
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Q2 · 2019 · 2 marks
The coordination number of Gd in \mathrm{GdCl}_{3} .6 \mathrm{H}_{2} \mathrm{O} is
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Answer: (c)
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Q3 · Dec 2019 · 2 marks
Pair of lanthanide ions which show significant deviation between the experimental and calculated magnetic moments, considering contribution from the ground state only
- (a) Gd and Lu
- (b) Sm and Th
- (c) Eu and Tb
- (d) Sm and Eu
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Answer: (d)
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Q4 · June 2018 · 2 marks
Trivalent lanthanide ion having isotropic magnetic susceptibility is
- (a) \mathrm{Eu}^{+3}
- (b) \mathrm{Gd}^{+3}
- (c) \mathrm{Yb}^{+3}
- (d) \mathrm{Lu}^{+3}
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Answer: (b)
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Q5 · 2018 · 2 marks
Consider following statements for \mathrm{Eu}^{+3}
- (a) The positions of sharp bands in UV-vis spectra of its complexes depend heavily on the ligand environment A, C and D
- (b) Its ground state term symbol is { }^{7} \mathrm{~F}_{0} B, C and D
- (c) The observed magnetic moment is due to populated higher level A, B and D
- (d) At 2 K its magnetic moment approaches to zero The set of correct statements is A, B and C
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Answer: (b)
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Q6 · 2017 · 2 marks
Which one of the following pairs has two magic numbers for closed nuclear shells?
- (a) 8,10
- (b) 10, 20
- (c) 50,82
- (d) 82,130
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Answer: (c)
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Q7 · 2017 · 2 marks
The calculated and observed magnetic moments (in B.M.) of aqua complex of a lanthanide ion are 0 and ~3.5, respectively. The lanthanide ion is
- (a) \mathrm{Pm}^{+3}
- (b) \mathrm{Pr}^{+3}
- (c) \mathrm{Eu}^{+3}
- (d) \mathrm{Sm}^{+3}
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Answer: (c)
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Q8 · 2017 · 2 marks
Consider the following statement(s) for actinides (An):
- (a) Oxidation states greater than +3 are more frequent in An compared to lathanides (Ln)
- (b) Some An(III) ions show d-d transitions
- (c) \mathrm{UO}_{2}{ }^{+2} and \mathrm{PuO}_{2+2} are stable
- (d) Some of actinides do not have radioactive isotopes
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Answer: (a)
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Q9 · 2016 · 2 marks
For monoionic complex \left[\mathrm{UO}_{2}\left(\mathrm{NO}_{3}\right)_{3}\right]^{-1} the correct coordination number and geometry respectively, are
- (a) 8 and hexagonal bipyramedal
- (b) 5 and square pyramidal
- (c) 8 and square antiprism
- (d) 5 and trigonal bipyramidal
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Answer: (a)
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Q10 · 2016 · 2 marks
The g values for \mathrm{Ce}^{+3}\left(4 \mathrm{f}^{1}\right) and \operatorname{Pr}^{+3}\left(4 \mathrm{f}^{2}\right) are, respectively
- (a) 3 / 7 and 2 / 5
- (b) 5 / 7 and 4 / 5
- (c) 6/7 and 3/5
- (d) 6/7 and 4/5
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Answer: (d)
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Q11 · 2015 · 2 marks
Consider the following statements for \mathrm{(NH_4)_2[Ce(NO_3)_6]} (Z) (A) Coordination number of Ce is 12 (B) Z is paramagnetic (C) Z is an oxidising agent (D) Reaction of \mathrm{Ph_3PO} with Z gives a complex having coordination number 10 for Ce. The correct statements are
- (a) A, B and C
- (b) B, A and D
- (c) B, C and D
- (d) A, C and D
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Answer: (d)
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Q12 · 2015 · 2 marks
Consider the following statements with respect to uranium
- (a) \mathrm{UO}_{2}{ }^{+}disproportionates more easily than \mathrm{UO}_{2}{ }^{+2} A, B and D
- (b) \mathrm{U}_{3} \mathrm{O}_{8} is its most stable oxide of U A, C and D
- (c) Coordination number of U in \left[\mathrm{UO}_{2}\left(\mathrm{NO}_{3}\right)_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right] .4 \mathrm{H}, \mathrm{O} is six. B, C and D
- (d) \mathrm{UO}_{2}{ }^{+2} is linearThe correct set of statements is A, B and C
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Answer: (a)
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Q13 · 2015 · 2 marks
The metallic radii are abnormally high for which of the following pairs?
- (a) Eu, Yb
- (b) Sm, Tm
- (c) Gd, Lu
- (d) Nd, Ho
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Answer: (a)
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Q14 · 2015 · 2 marks
Which of the following statements are TRUE for the lanthanides?
- (a) the observed magnetic moment of Eu at room temperature is higher than that calculated from spin-orbit coupling
- (b) Lanthanide oxides are predominantly acidic in nature
- (c) The stability of Sm(II) is due to its half-filled sub-shell.
- (d) Lanthanide (III) ions can be separated by ion exchange chromatography
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Answer: (a)
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Q15 · 2014 · 2 marks
A comparison of the valence electron configuration of the elements, Sm and Eu suggests that
- (a) Sm is a better one electron reductant than Eu
- (b) Sm is a better one electron oxidant than Eu
- (c) Facile oxidation state is +2 for both the elements
- (d) both of these display similar redox behaviour
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Answer: (b)
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Q16 · 2014 · 2 marks
The correct order of the retention of cations on a sulfonated cation exchange resin column is
- (a) \mathrm{Ag}^{+}>\mathrm{K}^{+}>\mathrm{Na}^{+}>\mathrm{Li}^{+}
- (b) \mathrm{K}^{+}>\mathrm{Na}^{+}>\mathrm{Ag}^{+}>\mathrm{Li}^{+}
- (c) \mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Ag}^{+}
- (d) \mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{Ag}^{+}>\mathrm{K}^{+}
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Answer: (a)
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Q17 · 2014 · 2 marks
Hindered \beta-diketonates like \mathrm{dpmH}(\mathrm{dpmH}= dipivaloylmethane ) are used for the separation of lanthanides because complexes formed with dpmH can be separated by
- (a) Gel permeation chromatography
- (b) Gas chromatography
- (c) Gel filtration chromatography
- (d) Ion exchange chromatography
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Answer: (b)
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Q18 · 2013 · 2 marks
Consider following lanthanide (III) ions
- (a) Nd(III) B only
- (b) Gd(III) A and B only
- (c) Dy(III) The magnetic moment closest to the spin only value is(are) for A and C only
- (d) B and C only
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Answer: (a)
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Q19 · 2013 · 2 marks
The ground state term symbol for Nb (atomic number 41 ) is { }^{6} \mathrm{D}. The electronic configuration corresponding to this term symbol is
- (a) [\mathrm{Kr}] 4 \mathrm{~d}^{3} 5 \mathrm{~s}^{2}
- (b) [\mathrm{Kr}] 4 \mathrm{~d}^{4} 5 \mathrm{~s}^{1}
- (c) [\mathrm{Kr}] 4 \mathrm{~d}^{5} 5 \mathrm{~s}^{0}
- (d) [\mathrm{Kr}] 4 \mathrm{~d}^{3} 5 \mathrm{~s}^{1} 5 \mathrm{p}^{1}
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Answer: (b)
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Q20 · 2013 · 2 marks
The ground state forms of Sm and Eu respectively, are
- (a) { }^{7} \mathrm{~F}_{0} and { }^{6} \mathrm{H}_{5 / 2}
- (b) { }^{6} \mathrm{H}_{5 / 2} and { }^{7} \mathrm{~F}_{0}
- (c) { }^{2} \mathrm{~F}_{5 / 2} and { }^{5} \mathrm{I}_{4}
- (d) { }^{7} \mathrm{~F}_{6} and { }^{2} \mathrm{~F}_{7 / 2}
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Answer: (b)
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Q21 · 2012 · 2 marks
The least basic among the following is:
- (a) \mathrm{Al(OH)_3}
- (b) \mathrm{La(OH)_3}
- (c) \mathrm{Ce(OH)_3}
- (d) \mathrm{Lu(OH)_3}
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Answer: (a)
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Q22 · June 2012 · 2 marks
The least basic among the following is:
- (a) \mathrm{Al}(\mathrm{OH})_{3}
- (b) \mathrm{La}(\mathrm{OH})_{3}
- (c) \mathrm{Ce}(\mathrm{OH})_{3}
- (d) \mathrm{Lu}(\mathrm{OH})_{3}
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Answer: (a)
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Q23 · 2012 · 2 marks
The pair of lanthanides with the highest third-ionization energy is:
- (a) Eu, Gd
- (b) Eu, Yb
- (c) \mathrm{Dy}, \mathrm{Yb}
- (d) Lu, Yb
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Answer: (b)
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Q24 · 2012 · 2 marks
The lanthanide(III) ion having the highest partition coefficient between tri-n-butylphosphate and concentrated \mathrm{HNO}_{3} is:
- (a) La(III)
- (b) Eu(III)
- (c) Nd(III)
- (d) Lu(III)
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Answer: (d)
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Q25 · 2012 · 2 marks
Which one of the following shows the highest solubility in hot concentrated aqueous NaOH ?
- (a) \mathrm{La}(\mathrm{OH})_{3}
- (b) \mathrm{Nd}(\mathrm{OH})_{3}
- (c) \mathrm{Sm}(\mathrm{OH})_{3}
- (d) \mathrm{Lu}(\mathrm{OH})_{3}.
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Answer: (d)
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Q26 · 2012 · 2 marks
Consider the ions Eu(III), Gd(III), Sm(II) and Lu(III). The observed and calculated magnetic moment values are closest for the pair
- (a) Gd(III), Lu(III)
- (b) Eu(III), Lu(III)
- (c) Sm(III), Gd(III)
- (d) Sm(III), Eu(III)
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Answer: (a)
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Q27 · June 2011 · 2 marks
Among the following statements, identify the correct ones for complexes of lanthanide (III) ion.
- (a) Metal-ligand bond is significantly ionic. A, B and D only
- (b) Complexes rarely show isomerism. A, B and C only
- (c) The coordination number is not more than 8 . B and C only
- (d) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides. A and D only
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Answer: (a)
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Q28 · June 2011 · 2 marks
Statement I: The sizes of Zr and Hf are similar Statement II: Size of Hf is affected by lanthanide contraction.
- (a) Statement I and II are correct and II is correct explanation of 1 .
- (b) Statement I and II are correct but II is not a correct explanation of 1 .
- (c) Statement 1 is correct and II is incorrect
- (d) Statements I and II both are incorrect.
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Answer: (a)
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Q29 · 2011 · 2 marks
The actual magnetic moment shows a large deviation from the spin-only formula in the case of
- (a) \mathrm{Ti}^{1+}
- (b) \mathrm{V}^{3+}
- (c) \mathrm{Gd}^{3+}
- (d) \mathrm{Sm}^{3+}
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Answer: (d)
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