1
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :
A
Ru
B
Mn
C
Co
D
Fe
2
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
A
4f76s2
B
4f6
C
4f7
D
4f66s2
3
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II :

List - I
(Metal Ion)
List - II
(Group of Qualitative analysis)
(a) $$M{n^{2 + }}$$ (i) Group - III
(b) $$A{s^{3 + }}$$ (ii) Group - IIA
(c) $$C{u^{2 + }}$$ (iii) Group - IV
(d) $$A{l^{3 + }}$$ (iv) Group - IIB


Choose the most appropriate answer from the options given below :
A
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
B
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
C
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
D
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
A
Nd
B
Yb
C
La
D
Ce
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