As the number of nodes increases, the energy of the orbital
Decreases
Increases
Is halved
Remains the same
What is the maximum number of electrons in an atom that can have the quantum numbers n = 3, ml = +1 ?
8
4
16
6
The observation that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration is associated with
Heisenberg's uncertainty principle
Pauli's exclusion principle
Aufbau principle
Hund's rule of maximum multiplicity
The orbital which does not have any directional characteristic is
dz2
px
s
dx2 - y2
What is the de Broglie wave length of a particle of mass 0.5g and velocity 50m/s ?
6.626 × 10-31m
2.65 × 10-32 m
2.65 × 10-31 m
none of these
The maximum kinetic energy of photo electrons ejected from a metal when it is irradiated with radiation of frequency 3.5 × 1014 s-1 is 6.626 × 10-20J.What is the threshold frequency of the metal ?
2.5 × 10-14 s-1
4.5 × 1014 s-1
2.5 × 1014s-1
2 × 10-14 s-1
The uncertainity in the momentum of an electron is 2.0 × 10-5kgms-1. The uncertanity in its position will be
5.27 × 10-30m
1.05 × 10-26m
2.638 × 10-30m
3.313 × 10-28m
What is the wave length of a radio wave having frequency 2.5 × 105 Hz ?
1.2 × 103m
1.2 × 10-3m
8.33 × 102m
None of these
The spectral line obtained when an electron jumps from n = b to n = 4 energy level belongs to
Paschen series
Brackett series
Lyman series
The number of nodal planes in 2pz orbital is
Zero
One
Two
Infinity
