1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
The reason for greater range of oxidation states in actinoids is attributed to
A
actinoid contraction
B
5$$f$$, 6d and 7s levels having comparable energies
C
4$$f$$ and 5d levels being close in energies
D
the radioactive nature of actinoids.
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Which one of the following statements related to lanthanoids is incorrect?
A
Europium shows + 2 oxidation state.
B
The basicity decreases as the ionic radius decreases from Pr to Lu.
C
All the lanthanons are much more reactive than aluminium.
D
Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis.
3
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
The electronic configuration of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No.65) are
A
[Xe]4f65d16s2,
[Xe]4f75d16s2 and [Xe]4f85d16s2
B
[Xe]4f7 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2
C
[Xe]4f7 6s2, [Xe]4f8 6s2 and [Xe]4f8 5d1 6s2
D
[Xe]4f6 5d1 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?
A
SO2 is reduced.
B
Green Cr2(SO4)3 is formed.
C
The solution turns blue.
D
The solution is decolourised.
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