Which one of the following does Bohr theory fails to explain ?
Stability of hydrogen
Line spectra of hydrogen atom
Line spectra of Li2+
Splitting of spectral lines in the presence of magnetic field
No two electrons in an atom can have the same set of four quantum number. This is the statement of
Pauli exclusion principle
Hund's rule
Aufbau principle
Avagadro's law
In hydrogen atom if energy of an electron in ground state is 13.6 ev, then that in the first excited state is __________________.
6.8 ev
1.51 ev
3.4 ev
13.6 ev
If λ1 and λ2 are the wave lengths of characteristic X - ray and gamma rays respectively then what is the relation between them ?
λ1 = λ2
λ1 > λ2
λ1 = 1/λ2
λ1 < λ2
Which theory observed that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration ?
Heisenberg's uncertainty principle
Pauli's exclusion principle
Hund's rule of maximum multiplicity
The ground state of an atom means that all the electrons are?
Having the same energy
In the lowest possible energy state
In the first orbit
In the nucleus
What is the orbital angular momentum of an electron in 3s orbital?
Zero
h/2π
√2 h/2π
None of these
What will be the total spin resulting from a d6 configuration?
3
3/2
1
2
How many electrons will be present in the highest principal energy level of cobalt (z = 27) ?
7
9
What is the ratio between the energy of a photon of 1500 Ao wave length radiation to that of 3000 Ao wave length radiation ?
1/4
1/2
4
