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1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Which one of the following ions is the most stable in aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
A
V3+
B
Ti3+
C
Mn3+
D
Cr3+
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Identify the incorrect statement among the following:
A
Lanthanoid contraction is the accumulation of successive shrinkages.
B
As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
C
Shielding power of 4$$f$$ electrons is quite weak.
D
There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
3
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+.
4
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.
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