1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The correct order of the atomic radii of C, Cs, Al, and S is :
A
S < C < Al < Cs
B
S < C < Cs < Al
C
C < S < Al < Cs
D
C < S < Cs < Al
2
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The 71st electron of an element X with an atomic number of 71 enters into the orbital;
A
4f
B
6s
C
6p
D
5d
3
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The electronegativity of aluminium is similar to :
A
Beryllium
B
Carbon
C
Boron
D
Lithium
4
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
A
increase in atomic radii and decrease in ionic radii
B
increase in both atomic and ionic radii
C
decrease in both atomic and ionic radii
D
decrease in atomic radii and increase in ionic radii
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