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1
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
2
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+
3
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Among the statements (I – IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.
A
(I), (II) and (IV)
B
(II), (III) and (IV)
C
(I), (III) and (IV)
D
(I), (II) and (III)
4
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Consider the hypothetical situation where the azimuthal quantum number, $$l$$, takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with atomic number :
A
13 has a half-filled valence subshell
B
9 is the first alkali metal
C
8 is the first noble gas
D
6 has a 2p-valence subshell
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