Question # 1

Splitting of spectral lines when atoms are subjected to strong electric field is called:

Choose an answer

Zeeman effect.

Stark effect

Photoelectric effect.

Compton effect.

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Choose an answer

Voltage is low

Discharge tube is not coloured

Gas does not conduct current under ordinary pressure

Temperature low

The quantum number which describes the shape of the orbital is

Choose an answer

Principle quantum number

Spin quantum number

Azimathal quantum number

Magnetic quantum number

Rutherford's atomic model suggests the existence of

Choose an answer

Atom

Nucleus

alpha particle

Measons

Charge on electron was discovered by:

Choose an answer

Millikan.

Crook.

Neil Bohr.

Rutherford.

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Choose an answer

low ionization energy of sodium

sublimation of metallic sodium to give yellow vapour

emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region

photosenitivity

Quantum number values for 2p orbitals are

Choose an answer

n = 2, l = 1

n = 1, l = 2

n = 1, l = 0

n = 2, l = 0

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Choose an answer

Protons

Electric field

X-rays

a - particles

The energy of ionization of an atom is the energy difference between orbital

Choose an answer

The total number of possible values of magnetic quantum number for the value of l=3 is

Choose an answer

3

1

5

7

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Choose an answer

Electric field

Magnetic field

Incident light

X-rays

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Choose an answer

Stark effect

Zeeman effect

Compton effect

Photoelectric effect

Choose an answer

Neutrons are attracted by nucleus

Neutrons carry out nuclear reactions

Neutrons carry no charge

Neutrons are electromagnetic radiations

The number of de-electrons retained in Fe²⁺(At.No. of Fe = 26) ions is

Choose an answer

3

4

5

6

The radius of first orbit of hydrogen atom

Choose an answer

0.329 A°

0.429 A°

0.529 A°

0.229 A°

Which of the following was discovered first:

Choose an answer

Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

When 6s orbital is complete then next electron goes to

Choose an answer

6p

6d

5d

4f

In the ground state of an atom the electron is present

Choose an answer

In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

The wave number of light emitted by a certain source is 2 x 10⁵m. The wavelength of this light will be:

Choose an answer

500 NM.

500 M.

200 NM.

5 x 10⁷m

E = hv is the

Choose an answer

Spectral equation

Plank's equation

de Broglie's equation

None of these

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Choose an answer

Hund's rule

Pauli exclusion principle

Aufbau principle

Mosley's law

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

Choose an answer

Orientation of orbital in space

Fact that two electrons in the same orbital should have opposite spins

Energy of the orbital

Spin of the electron

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Choose an answer

Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Choose an answer

Na

O

Cl

N

The spectrum of He is expected to be similar to that of

Choose an answer

H

Na

He⁺

Li⁺

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Choose an answer

Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1. The wavelength of this light will be

Choose an answer

500 nm

500 m

200 nm

5 x 10⁷m

The total values of magnetic quantum number of subshell are five, the subshell is

Choose an answer

S-subshell

P-subshell

D-subshell

F-subshell

Which of the following is not a property of cathode rays

Choose an answer

They can produce x-rays when they strike a heavy metal anode

They can cause reduction reaction

They produce fluorescence in rare earth and minerals

They comprise neutral particles

The velocity of photon is:

Choose an answer

Independent of its wavelength.

Depends on its wavelength.

Equal to square of its amplitude

Depends on its source.

The principle quantum number describes

Choose an answer

The distance form the nucleus

The shape of the orbital

The orientation of the orbital

The spin of the electron

More Classes

Other Links

ECAT Chemistry Chapter 5 Atomic Structure Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer