1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
A
Eu2+
B
Yb2+
C
Ce2+
D
Sm2+
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Change Language
The catalytic activity of transition metals and their compounds is ascribed mainly to
A
their magnetic behaviour
B
their unfilled $$d$$-orbitals
C
their ability to adopt variable oxidation states
D
their chemical reactivity
3
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Change Language
Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential $$\left( {E_{{M^{2 + }}/M}^o} \right)$$ value has a positive sign?
A
Co (Z = 27)
B
Ni (Z = 28)
C
Cu (Z = 29)
D
Fe (Z = 26)
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following exhibits only + 3 oxidation state?
A
U
B
Th
C
Ac
D
Pa
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