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Exam Details

CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018

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Questions 40
Duration 180 mins
Package CSIR NET & SET - Previous Year Papers

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Difficulty distribution

Medium 33 82.5%
Easy 4 10%
Hard 3 7.5%

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Multiple Choices 40 100%

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1
2018 · Unclassified
CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018
The correct order of acceptor ability of the phosphorus ligands is
A
PMe3> PPh3>P(OPh)3> PF3
B
PF3>P(OPh)3> PPh3> PMe3
C
P(OPh)3>PPh3>PMe3>PPh3
D
PF3> PMe3> PPh3>P(OPh)3
2
2018 · Unclassified
CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018
In the 31P[1H]NMR spectrum of a diamagnetic complex mer-[M(PR3)3Cl3] (M = transition metal I= 0) expected number of resonance(s) is
A
Three
B
One
C
Two
D
Six
3
2018 · Unclassified
CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018
Consider the species NO, l3, l2– , Cu2+and VO2+. The number of paramagnetic species among them and the EPR inactive species, respectively are
A
4 and l2–
B
4 and l2
C
3 and NO, Cu2+
D
3 and VO2+, Cu2+
4
2018 · Unclassified
CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018
Identify the correct statement(s) for H3B.CO
(a) sp2 hybridized orbital of B accepts the lone pair of CO.
(b) its VCO value is more than that for free CO.
(c) Formal oxidation state of C is +4 in the compound.
Answer is
A
(a) and (b)
B
(b) only
C
(a) and (c)
D
(a) only
5
2018 · Unclassified
CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018
Match the items of column I with those of Column II.
Correct answer is
A
(a) iv; (b) iii, (c) ii; (d) i
B
(a) iv; (b) ii, (c) iii; (d) i
C
(a) iii; (b) ii, (c) iv; (d) i
D
(a) i; (b) iii, (c) ii; (d) iv
6
2018 · Unclassified
CHEMICAL SCIENCE PART B ( DECEMBER 2018) 2018
Consider compounds PF5, SbF5,PH3 and SbH3. The strongest acid and the strongest base among these are, respectively,
A
PF5 and PH3
B
SbF5 and PH3
C
PF5 and SbH3
D
SbF5 and SbH3