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1
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Outermost electronic configuration of a group 13 element, E, is 4s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :
A
[Kr] 3d10 4s2 4p2
B
[Ar] 3d10 4s2 4p2
C
[Xe] 5d10 6s2 6p2
D
[Kr] 4d10 5s2 5p2
2
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements :

Statement I : Bohr's theory accounts for the stability and line spectrum of Li+ ion.

Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is false but statement II is true.
B
Both statement I and statement II are true.
C
Statement I is true but statement II is false.
D
Both statement I and statement II are false.
3
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
The ionic radius of Na+ ions is 1.02 $$\mathop A\limits^o $$. The ionic radii (in $$\mathop A\limits^o $$) of Mg2+ and Al3+, respectively, are
A
1.05 and 0.99
B
0.72 and 0.54
C
0.85 and 0.99
D
0.68 and 0.72
4
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
A certain orbital has no angular nodes and two radial nodes. The orbital is :
A
2s
B
3s
C
3p
D
2p
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