1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The electronegativity difference berween N and F is greater than that between N and H yet the dipole moment of NH3 (1.5D) is larger than that of NF3 (0.2 D). This is because
A
in NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same direction
B
in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
C
in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
D
in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions.
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
A
Ni2+, Cu+
B
Ni2+, Ti3+
C
Sc3+, Ti3+
D
Sc3+, Co2+.
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is
A
more active nature of the actinoids
B
more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
C
lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
D
greater metallic character of the lanthanoids than that of the corresponding actinoids.
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
Copper sulphate dissolves in excess of KCN to give
A
Cu(CN)2
B
CuCN
C
[Cu(CN)4]3$$-$$
D
[Cu(CN)4]2$$-$$
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