Atoms and Molecules

This MCQ is based on Atoms and Molecules which includes Atomic Structure, Atomic Models, Dalton’s Atomic Theory, Thomson Atomic Model, Rutherford Atomic Theory, and many more.

Start Quiz

The ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state are

-13.6 eV, 27.2 eV 13.6 eV,-13.6 eV 13.6 eV,-27.2 eV 27.2 eV,-27.2 eV

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is

1 : 1 1 : -1 2 : -1 1 : -2

Ionisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li++ atom in the 2nd excited state

E 3E 6E 9E

The binding energy of a deuteron is about:

2.22 MeV 2.22 J 2.22 eV None of these

The concept of electron spin was introduced by:

Becquerel Goudsmit Millikan Uhlenbeek and Goudsmit

The mass of a neutron is:

1.00866 u 1.0866 u 1.866 u 0.1866 u

The principle that a quantum orbital cannot be occupied by more than two electrons was given by:

Pauli Millikan Hund None of these

What causes spectral lines?

The transition of electrons between two energy levels The transition of electrons between two wavelength ranges Magnetic and electric field exiting in an atom The transition of electrons from electric to magnetic field

How many spectral lines are there in the hydrogen spectrum?

Infinity Zero Multiple One

Which theory explained that electrons revolved in circular orbits?

Einstein theory Bohr theory Rydberg theory de – Broglie theory

When is hydrogen stable?

When the electron jumps to higher energy levels When an electric field is introduced When a magnetic field is introduced When the electron is at its ground state

Which of the following is found in the UV region of the spectrum?

Pfund series Brackett series Lyman series Paschen series

P-decay produces:

Isobars

Isotopes

Isotones

All the above

For ionization of excited Hydrogen atom, the, required energy is:

A little less than 13.6

Equal to 13.6

More than 13.6

3.4 or less