1
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
The hybridization of orbitals of N atom in $$NO_3^-$$, $$NO_2^+$$ and $$NH_4^+$$ are respectively :
A
sp , sp2, sp3
B
sp2, sp , sp3
C
sp , sp3, sp2
D
sp2, sp3, sp
2
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
The structure of IF7 is :
A
trigonal bipyramid
B
octahedral
C
pentagonal bipyramid
D
square pyramid
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Using MO theory, predict which of the following species has the shortest bond length?
A
$$O_2^+$$
B
$$O_2^-$$
C
$$O_2^{2-}$$
D
$$O_2^{2+}$$
4
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
The bond dissociation energy of B - F in BF3 is 646 kJ mol-1 whereas that of C - F in CF4 is 515 kj mol-1. The correct reason for higher B - F bond dissociation energy as compared to that of C - F is
A
stronger $$\sigma$$ bond between B and F in BF3 as compared to that between C and F in CF4
B
significant $$p\pi - p\pi$$ interaction between B and F in BF3 whereas there is no possibility of such interaction between C and F in CF4
C
lower degree of $$p\pi - p\pi$$ interaction between B and F in BF3 than that between C and F in CF4
D
smaller size of B - atom as compared to that of C- atom.
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