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1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
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.
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
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.
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
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+
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Which one of the following does not correctly represent the correct order of the property indicated against it?
A
Ti < V < Cr < Mn; increasing number of oxidation states
B
Ti3+ < V3+ < Cr3+ < Mn3+ : increasing magnetic moment
C
Ti < V < Cr < Mn : increasing melting points
D
Ti < V < Mn < Cr : increasing 2nd ionization enthalpy
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