1

IIT-JEE 2002 Screening

MCQ (Single Correct Answer)
Which of the following molecular species has unpaired electrons(s)?
A
N2
B
F2
C
$$O_2^-$$
D
$$O_2^{2-}$$
2

IIT-JEE 2002 Screening

MCQ (Single Correct Answer)
Identify the least stable ion amongst the following
A
Li-
B
Be-
C
B-
D
C-
3

IIT-JEE 2002 Screening

MCQ (Single Correct Answer)
Specify the coordination geometry around and hybridisation of N and B atoms in a 1 : 1 complex of BF3 and NH3
A
N : tetrahedral, sp3; B : tetrahedral, sp3
B
N : pyramidal, sp3; B : pyramidal, sp3
C
N : pyramidal, sp3; B : planar, sp2
D
N : pyramidal, sp3; B : tetrahedral, sp3
4

IIT-JEE 2001 Screening

MCQ (Single Correct Answer)
The common features among the species CN-, CO and NO+ are
A
bond order three and isoelectronic
B
bond order three and weak field ligands
C
bond order two and $$\pi$$-acceptors
D
isoelectronic and weak field ligands

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