CBSE
Wave number of a spectral line for a given transition is xcm-1 for He+ then its value for Be+ (iso electronic of H+) for same transition is:
x cm-1
4x cm-1
cm-1
2x cm-1
Total number of atoms represented by the compound CuSO4 · 5H2O is :
27
21
5
8
Neutron is discovered by
Chadwick
Rutherford
Yukawa
Dalton
What is X in the following nuclear reaction?
7N14 + 1H1 8O15 + X
0n1
-1e0
+1e0
When electrons are trapped into the crystal in anion vacancy, the defect is known as :
Schottky defect
Frenkel defect
stoichiometric defect
F-centres
The correct sets of quantum numbers which represents the highest energy level in an atomis:
For an electron whose x-positional uncertainity is 1x 10-10 m, the uncertainity in the x-component of the velocity in ms-1 will be of the order of:
106
103
1012
1015
Which of the following have maximum number of unpaired electrons ?
Fe3+
Fe2+
Co2+
Co3+
If magnetic quantum number of a given atom represented by -3, then what will be its principal quantum number ?
2
3
4
5
The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is .
The value of n, will be
[R=Rydberg constant]
1
2
3
4