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

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

The 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            $\mathcal{l}$           m          s 

(1) Electron 1             3            0             0           -1/2

(2) Electron 2             4            0             1           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 - 

(A) Electron 3 > Electron 1 > Electron 4> Electron 2

(B) Electron 4> Electron 2 > Electron 3 > Electron 1

(C) Electron 3 > Electron 2 > Electron 4 > Electron 1

(D) Electron 2 > Electron 4 > Electron 3 > Electron 1

The maximum number of atomic orbitals associated with a principal quantum number 5 is

(A)9

(B)12

(C) 16

(D) 25

Rutherford's scattering experiment is related to - 

(A) Nucleus

(B) proton

(C) Electron

(D) Neutron

The total number of neutrons in dipositive zinc ions with mass number 70 is -

(A) 34

(B) 40

(C)36

(D) 38

When accelerated electrons are direct against an anticathode in an X-ray tube, the radiation obtained has a continuous spectrum with a wavelength minimum,

$\lambda$_min = (1.24 x 10^-6/V) m, where V is the voltage used for accelerating the electrons. Calculate $\lambda$_min for V= 5 x 10⁴ volts.

(A) 1.25 Å

(B) 0.75 Å

(C)0.25 Å

(D) 1.00 Å

The wavelengths of two photons are 2000 Å and 4000 Å respectively. What is the ratio of their energies?

(1) 1/4

(2) 4

(3) 1/2

(4) 2

The ion that is isoelectronic with CO is-

(A) CN^-

(B) O₂⁺

(C) O₂^-

(D) N₂⁺