1
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.
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Which of the following pair of species have the same bond order?
A
CN- and NO+
B
CN- and CN+
C
$$O_2^-$$ and CN-
D
NO+ and CN+
3
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Which of the following species exhibits the diamagnetic behaviour?
A
$$O_2^{2−}$$
B
NO
C
$$O_2^+$$
D
O2
4
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizinig order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+?
A
Mg2+ < Be2+ < K+ < Ca2+
B
K+ < Ca2+ < Mg2+ < Be2+
C
Be2+ < K+ < Ca2+ < Mg2+
D
Ca2+ < Mg2+ < Be2+ < K+
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