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1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
Among the following, the pair in which the two species are not isostructural is
A
SiF4 and SF4
B
IO3$$-$$ and XeO3
C
BH4$$-$$ and NH4+
D
PF6$$-$$ and SF6
2
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
H2O is dipolar, whereas BeF2 is not. It is because
A
the electronegativity of F is greater than that of O
B
H2O involves hydrogen bonding whereas BeF2 is a discrete molecule
C
H2O is linear and BeF2 is angular
D
H2O is angular and BeF2 is linear.
3
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
In BrF3 molecule, the lone pairs occupy equatorial positions to minimize
A
lone pair - bond pair repulsion only
B
bond pair - bond pair repulsion only
C
lone pair - lone pair repulsion and lone pair - bond pair repulsion
D
lone pair - lone pair repulsion only.
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?
A
sigma-bond is stronger than a pi-bond.
B
Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
C
Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
D
Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.
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