Total number of atoms represented by the compound CuSO₄ · 5H₂O is :

• 27

• 21

• 5

• 8

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:

• $\mathrm{n}=4 , \mathrm{l}=0 , \mathrm{m}=0 , \mathrm{s} = + \frac{1}{2}$

• $\mathrm{n}=3 , \mathrm{l}=0 , \mathrm{m}=0 , \mathrm{s} = + \frac{1}{2}$

• $\mathrm{n}=3 , \mathrm{l}=1 , \mathrm{m}=1 , \mathrm{s} = + \frac{1}{2}$

• $\mathrm{n}=3 , \mathrm{l}=2 , \mathrm{m}= -1 , \mathrm{s} = + \frac{1}{2}$

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

• $\frac{\mathrm{x}}{4}$cm^-1

• 2x cm^-1

Ratio of radii of second and first Bohr orbits of H atom is

• 2

• 4

• 3

• 5

India conducted an underground nuclear test at

• Narora

• Tarapur

• Pushkar

• Pokharan

Dual nature of particle was-given by

• Bohr theory

• Thomson model

• Heisenberg principle

• de-Broglie equation

A golf-ball weigh 40.0 gm. If it is moving with a velocity of 20.0 ms^-1, it's de-Broglie wavelength is

• 1.66 x 10^-34 nm

• 8.28 x 10^-32 nm

• 8.28 x 10^-25 nm

• 1.66 x 10^-24 nm

Which is the shortest wavelength line in the Lyman series of the hydrogen spectrum? (R= 1.097 x 10^-2 nm^-1)

• 94.21 nm

• 91.16 nm

• 911.6 nm

• 933.6 nm

Which of the following order of ionisation energy is correct?

• B < Be < N < C

• Be > B > C > N

• B < Be < C < N

• Be < B < C < N