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1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Reason of lanthanoid contraction is
A
negligible screening effect of 'f'- orbitals
B
increasing nuclear charge
C
decreasing nuclear charge
D
decreasing screening effect.
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Magnetic moment 2.83 BM is given by which of the following ions?
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)
A
Ti3+
B
Ni2+
C
Cr3+
D
Mn2+
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Change Language
Sc (Z = 21) is a transition element but Zn (Z = 30) is not because
A
both Sc3+ and Zn2+ ions are colourless and form white compounds.
B
in case of Sc, 3d orbitals are partially filled but in Zn these are filled.
C
last electron is assumed to be added to 4s level in case of Zn.
D
both Sc and Zn do not exhibit variable oxidation states.
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following statements about the interstitial compounds is incorrect?
A
They are much harder than the pure metal.
B
They have higher melting points than the pure metal.
C
The retain metallic conductivity.
D
They are chemically reactive.
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