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1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Identify the incorrect statement among the following :
A
d-Block elements show irregular and erratic chemical properties among themselves
B
La and Lu have partially filled d orbitals and no other partially filled orbitals
C
The chemistry of various lanthanoids is very similar
D
4f and 5f orbitals are equally shielded
2
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :
A
the 5f orbitals are more buried than the 4f orbitals
B
there is a similarity between 4f and 5f orbitals in their angular part of the wave function
C
the actinoids are more reactive than the lanthanoids
D
the 5f orbitals extend further from the nucleus than the 4f orbitals
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
The “spin-only” magnetic moment [in units of Bohr magneton, (µB)] of Ni2+ in aqueous solution would be : (Atomic number of Ni = 28)
A
2.84
B
4.90
C
0
D
1.73
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
Lanthanoid contraction is caused due to :
A
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge
B
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
C
the same effective nuclear charge from Ce to Lu
D
the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
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