Which of the following sets of quantum numbers represent an impossible arrangement - 

       n   l    m     s

(1)  3   2   -2   (+)1/2

(2)  4   0   0    (-)1/2

(3)  3   2   -3   (+)1/2

(4)  5   3   0   (-)1/2

How many unpaired electrons are present in Ni²⁺ cation (atomic number = 28)

(1) 0

(2) 2

(3) 4

(4) 6

Correct set of four quantum numbers for the outermost electron of rubidium (Z=37) is:

(1) 5, 0, 0, 1/2

(2) 5, 1, 0, 1/2

(3) 5, 1, 1, 1/2

(4) 6, 0, 0, 1/2

Number of unparired electrons in 1S² 2S² 2P³ is -

1. 2

2. 0

3. 3

4. 1

The quantum numbers of four electrons are given below.

                                  n            $\mathcal{l}$           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

Of the following transitions in hydrogen atom, the one which gives an absorption line of lowest frequency 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$\mathrm{\pi }$

(2) > h/4$\mathrm{\pi }$

(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