Question # 1

Choose an answer

Plank's equations

de Broglie's equations

Heisenburg's equation

None

Which one of the following statements is true about discovery of neutrons?

Choose an answer

These particles were formed by the bombardment of Alpha-particles on Beryllium.

These particles are formed by the spiting of alpha-particles.

These particles were discovered by natural radioactivity.

None of above.

In the ground state, an element has 13 electrons in its M shell. The element is

Choose an answer

Copper

Chromium

Nickel

Iron

Energy of electron in the infinite Bohr orbit of H-atom is

Choose an answer

0 KJ/mole

1 KJ/mole

-1 KJ/mole

-1313.32 KJ/mole

For which of the following sets of quantum numbers and electron will have the highest energy?

Choose an answer

3,2,1,1/2

4,2,-1,1/2

4,1,0,-1/2

5,0,0,1/2

Rutherford's model of atom failed because:

Choose an answer

The atom did o have a nucleus and electrons

It did not account fro the attraction b/w protons and neutrons

It did no account for the stability of the atom.

There is actually no space b/w the nucleus ad the electrons.

Mass of simple electron is:

Choose an answer

9.1 x 10^-31 kg

9.1 x 10^-30 kg

1.66 x 10^-31 kg

9.1 x 10^-31 kg

Charge on electron was discovered by:

Choose an answer

Millikan.

Crook.

Neil Bohr.

Rutherford.

Charge to mass ratio of electron was discovered by:

Choose an answer

Millika.

Rutherford.

J.J. Thomson.

Chadwick.

When potassium metal is exposed to violet light

Choose an answer

Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

The absorption of electrons takes place

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 e.m value for positive rays maximum for:

Choose an answer

Oxygen.

Nitrogen.

Helium.

Hydrogen.

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

Choose an answer

When electrons revolve in stationary orbits

Choose an answer

There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

The experimental evidences for the existence of atomic nucleus comes from:

Choose an answer

Line spectrum of hydrogen.

Magnetic bonding of cathode rays.

Millikan oil drop experiment.

Scattering of alpha particles by thin metal foil.

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

The value of charge on electron is

Choose an answer

1.602 x 10^-19coulombs

1.602 x 10^-18coulombs

1.602 x 10^-17coulombs

1.602 x 10^-16coulombs

The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is

Choose an answer

N

Li

P

Na

The orbitals having n + l = 5 are

Choose an answer

2p, 3d,3s

3p, 3d, 5s

3s, 4p, 4d

5s, 4p, 3d

The size of electronic shell is described by

Choose an answer

Azimuthal Q. no

Magnetic Q.No

Spin Q. No

Principle Q. No

Choose an answer

Neutrons are attracted by nucleus

Neutrons carry out nuclear reactions

Neutrons carry no charge

Neutrons are electromagnetic radiations

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Choose an answer

Hund's rule

Heisenberg's principle

Paulit exclusion principle

Auf bau principle

Alpha rays consist of:

Choose an answer

Neutrons.

Helium nucleus.

Protons.

Hydrogen nucleus.

Energy of electron in first orbit of H atom is

Choose an answer

-45.32 KJ/mole

-82.08 KJ/mole

-52.53 KJ/mole

-1313.31 KJ/mole

The limiting line of Blamer series in hydrogen spectrum lies in

Choose an answer

Visible regions

Ultraviolet region

Infrared region

x-rays region

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

The wave number of the line emitted is 109.678 x 10⁵m^-1in the Lyman series when electron transition occurs

Choose an answer

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

Choose an answer

Zeeman effect

Stark effect

Photoelectric effect

Compton effect

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Choose an answer

3 and 5

3 and 7

3 and 9

2 and 5

Bohr model of atom is contradicted by:

Choose an answer

Planck's quantum theory

Pauli's exclusion theory

Heisenberg's uncertainty principle.

All of above.

Anode is the surface on which probability of finding electron is:

Choose an answer

50%

Less than 10%.

More than 95%.

Zero.

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