1
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
The correct order of the ionic radii of
O2–, N3–, F , Mg2+, Na+ and Al3+ is :
A
N3– < O2– < F < Na+ < Mg2+ < Al3+
B
N3– < F < O2– < Mg2+ < Na+ < Al3+
C
Al3+ < Na+ < Mg2+ < O2– < F < N3–
D
Al3+ < Mg2+ < Na+ < F < O2– < N3–
2
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
The incorrect statement(s) among (a) - (c) is (are)

(a) W(VI) is more stable than Cr(VI).
(b) In the presence of HCl, permanganate titrations provide satisfactory results.
(c) Some lanthanoid oxides can be used as phosphors.
A
(a) and (b) only
B
(a) only
C
(b) only
D
(b) and (c) only
3
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
The elements with atomic numbers 101 and 104 belong to, respectively :
A
Group 6 and Actinoids
B
Actinoids and Group 4
C
Group 11 and Group 4
D
Actinoids and Group 6
4
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
The ionic radii of O2–, F, Na+ and Mg2+ are in the order :
A
F > O2– > Na+ > Mg2+
B
Mg2+ > Na+ > F > O2–
C
O2– > F > Mg2+ > Na+
D
O2– > F > Na+ > Mg2+
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