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1
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
2
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
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
A metal, $$M$$ forms chlorides in its $$+2$$ and $$+4$$ oxidation states. Which of the following statements about these chlorides is correct?
A
$$MC{l_2}$$ is more ionic than $$MC{l_4}$$
B
$$MC{l_2}$$ is more easily hydrolysed than $$MC{l_4}$$
C
$$MC{l_2}$$ is more volatile than $$MC{l_4}$$
D
$$MC{l_2}$$ is more soluble in anhydrous ethanol than $$MC{l_4}$$.
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Which of the following factors may be regarded as the main cause of lanthanide contraction?
A
Poor shielding of one of 4f electron by another in the subshell
B
Effective shielding of one of 4f electrons by another in the subshell
C
Poorer shielding of 5d electrons by 4f electrons
D
Greater shielding of 5d electrons by 4f electrons
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