Which of the following sets of quantum numbers represent an impossible arrangement?
n | l | m | s | |
1. | 3 | 2 | -2 | (+)\(\frac{1}{2}\) |
2. | 4 | 0 | 0 | (-)\(\frac{1}{2}\) |
3. | 3 | 2 | -3 | (+)\(\frac{1}{2}\) |
4. | 5 | 3 | 0 | (-)\(\frac{1}{2}\) |
How many unpaired electrons are present in Ni2+ cation (atomic number = 28)
1. 0
2. 2
3. 4
4. 6
Number of unpaired electrons in 1s2 2s2 2p3 is -
1. 2
2. 0
3. 3
4. 1
The quantum numbers of four electrons are given below.
n m s
(1) Electron 1 3 0 0 -1/2
(2) Electron 2 4 0 0 1/2
(3) Electron 3 3 2 0 1/2
(4) Electron 4 3 1 0 -1/2
The correct order of decreasing energy of these electrons is -
1. Electron 3 > Electron 1 > Electron 4> Electron 2
2. Electron 4> Electron 2 > Electron 3 > Electron 1
3. Electron 3 > Electron 2 > Electron 4 > Electron 1
4. Electron 2 > Electron 4 > Electron 3 > Electron 1
Which type of radiation is not emitted by the electronic structure of atoms:
1. Ultraviolet light
2. X-rays
3. Visible light
4. y-rays
An absorption line of the lowest frequency in the transition of hydrogen spectra is:
1. n=1 to n=2
2. n=3 to n=8
3. n=2 to n=1
4. n=8 to n=3
If uncertainty in the position of an electron is zero the uncertainty in its momentum will be:
1. <h/4
2. >h/4
3. zero
4. infinite
The maximum number of atomic orbitals associated with a principal quantum number 5 is-
1. 9
2. 12
3. 16
4. 25
The de Broglie wavelength of electron of He+ ion is 3.329Å. If the photon emitted upon de-excitation of this He+ ion is made to hit H atom in its ground state so as to liberate electron from it, what will be the de Broglie's wavelength of photoelectron ?
1. 0.1518 Å
2. 6.1518 Å
3. 2.3518 Å
4. 4.1218 Å
Velocity of helium atom at 300 K is 2.40 x 102 meter per sec. What is its wavelength? (mass number of helium is 4) -
1. 0.416 nm
2. 0.83 nm
3. 803 Å
4. 8000 Å