1

### IIT-JEE 2005 Screening

Which species has the maximum number of lone pair of electrons on the central atom?
A
[ClO3]-
B
XeF4
C
SF4
D
[I3]-
2

### IIT-JEE 2004 Screening

According to molecular orbital theory which of the following statement about the magnetic character and bond order is correct regarding $O_2^+$
A
Paramagnetic and Bond order < O2
B
Paramagnetic and Bond order > O2
C
Diamagnetic and Bond order < O2
D
Diamagnetic and Bond order > O2
3

### IIT-JEE 2003 Screening

Which of the following are isoelectronic and isostructural?
$NO_3^-$, $CO_3^{2-}$, $ClO_3^-$, SO3
A
$NO_3^-$, $CO_3^{2-}$
B
SO3, $NO_3^-$
C
$ClO_3^-$, $CO_3^{2-}$
D
$CO_3^{2-}$, SO3
4

### IIT-JEE 2002 Screening

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