1
JEE Main 2021 (Online) 25th February Morning Slot
+4
-1
The plots of radial distribution functions for various orbitals of hydrogen atom against 'r' are given below :

The correct plot for 3s orbital is :
A
(B)
B
(A)
C
(C)
D
(D)
2
JEE Main 2021 (Online) 25th February Morning Slot
+4
-1
In which of the following pairs, the outer most electronic configuration will be the same?
A
Cr+ and Mn2+
B
Ni2+ and Cu+
C
V2+ and Cr+
D
Fe2+ and Co+
3
JEE Main 2021 (Online) 24th February Evening Slot
+4
-1
According to Bohr's atomic theory :

(A) Kinetic energy of electron is $$\propto {{{Z^2}} \over {{n^2}}}$$.

(B) The product of velocity (v) of electron and principal quantum number (n), $$'vn' \propto {Z^2}$$.

(C) Frequency of revolution of electron in an orbit is $$\propto {{{Z^3}} \over {{n^3}}}$$.

(D) Coulombic force of attraction on the electron is $$\propto {{{Z^3}} \over {{n^4}}}$$.

Choose the most appropriate answer from the options given below :
A
(A), (C) and (D) only
B
(A) only
C
(C) only
D
(A) and (D) only
4
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
The correct statement about probability density (except at infinite distance from nucleus) is :
A
It can be zero for 1s orbital
B
It can be zero for 3p orbital
C
It can never be zero for 2s orbital
D
It can negative for 2p orbital
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