Engineering Entrance Sample Papers

Quantum Number Practice Questions

Quantum Number chemistry

Quantum number, Hund’s rule, Electronic configuration, Aufbau’s principle, Pauli’s exclusion principle and Shape of orbitals practice multiple choice questions.

Following Hund’s rule which element contains six unpaired electron
(a) Fe
(b) Co
(c) Ni
(d) Cr
Ans. (d)

Number of unpaired electrons in Mn4+ is
(a) 3
(b) 5
(c) 6
(d) 4
Ans. (a)

According  to Aufbau’s principle, which of the three 4d, 5p   and 5s will be filled with electrons first
(a) 4d
(b) 5p
(c) 5s
(d) 4d and 5s will be filled simultaneously
Ans. (c)

Related: Permutations and Combinations Quiz Set

p-orbitals of an atom in presence of magnetic field are
(a) Two fold degenerate
(b) Non degenerate
(c) Three fold degenerate
(d) None of these
Ans. (b)

Pauli’s exclusion principle states that
(a) Nucleus of an atom contains no negative charge
(b) Electrons move in circular orbits around the nucleus
(c) Electrons occupy orbitals of lowest energy
(d) All the four quantum numbers of two electrons in an atom cannot be equal
Ans. (d)

The number of unpaired electrons in nitrogen is
(a) 1
(b) 3
(c) 2
(d) None of these
Ans. (b)

How many unpaired electrons are present in cobalt [Co] metal
(a) 2
(b) 3
(c) 4
(d) 7
Ans. (b)

Related: AUEET Model Maths Question Paper

The maximum number of unpaired electron can be present in d orbitals are
(a) 1
(b) 3
(c) 5
(d) 7
Ans. (c)

The number of unpaired electrons in an O2 molecule is
(a) 0
(b) 1
(c) 2
(d) 3
Ans. (c)

Related: Top Engineering Colleges in Haryana

Total number of unpaired electrons in an atom of atomic number 29 is
(a) 1
(b) 3
(c) 4
(d) 2
Ans. (a)

Number of two electron can have the same values of …… quantum numbers
(a) One
(b) Two
(c) Three
(d) Four
Ans. (c)

The ground state term symbol for an electronic state is governed by
(a) Heisenberg’s principle
(b) Hund’s rule
(c) Aufbau principle
(d) Pauli exclusion principle
Ans. (c)

Consider the ground state of (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively
(a) 16 and 4
(b) 12 and 5
(c) 12 and 4
(d) 16 and 5
Ans. (b)

The number of 2p electrons having spin quantum number s = – ½ are
(a) 6
(b) 0
(c) 2
(d) 3
Ans. (d)

Related: Diversity of Life Biology Test Quiz

The outer electronic structure 3s2 3p5 is possessed by
(a) Cl
(b) O
(c) Ar
(d) Br
Ans. (a)

Azimuthal quantum number defines
(a) e/m ratio of electron
(b) Spin of electron
(c) Angular momentum of electron
(d) Magnetic momentum of electron
Ans. (c)

Quantum numbers of an atom can be defined on the basis of
(a) Hund’s rule
(b) Aufbau’s principle
(c) Pauli’s exclusion principle
(d) Heisenberg’s uncertainty principle
Ans. (c)

The magnetic quantum number of valence electron of sodium (Na) is
(a) 3
(b) 2
(c) 1
(d) 0
Ans. (d)

What is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number value is 4
(a) 10
(b) 18
(c) 32
(d) 54
Ans. (c)

Related: MCQs on Protista

An e has magnetic quantum number as –3, what is its principal quantum number
(a) 1
(b) 2
(c) 3
(d) 4
Ans. (d)

If n + l = 6, then total possible number of subshells would be
(a) 3
(b) 4
(c) 2
(d) 5
Ans. (a)

Which quantum number will determine the shape of the subshell
(a) Principal quantum number
(b) Azimuthal quantum number
(c) Magnetic quantum number
(d) Spin quantum number
Ans. (b)

For the n = 2 energy level, how many orbitals of all kinds are possible
(a) 2
(b) 3
(c) 4
(d) 5
Ans. (c)

Azimuthal quantum number for last electron of Na atom is
(a) 1
(b) 2
(c) 3
(d) 0
Ans. (d)

Related: NEET Structure of Atom Important Questions

A 3p orbital has
(a) Two spherical nodes
(b) Two non-spherical nodes
(c) One spherical and one non-spherical nodes
(d) One spherical and two non-spherical nodes
Ans. (c)

The number of possible spatial orientations of an electron in an atom is given by its
(a) Spin quantum number
(b) Spin angular momentum
(c) Magnetic quantum number
(d) Orbital angular momentum
Ans. (c)

There is no difference between a 2p and a 3p orbital regarding
(a) Shape
(b) Size
(c) Energy
(d) Value of n
Ans. (a)

The azimuthal quantum number is related to
(a) Size
(b) Shape
(c) Orientation
(d) Spin
Ans. (b)

Related: VITEEE Sample Paper (Chemistry)

The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 is
(a) 2
(b) 4
(c) 6
(d) 8
Ans. (c)

When the azimuthal quantum number has a value of l = 1, the shape of the orbital is
(a) Unsymmetrical
(b) Spherically symmetrical
(c) Dumb-bell
(d) Complicated
Ans. (c)

The principal quantum number represents
(a) Shape of an orbital
(b) Distance of electron from nucleus
(c) Number of electrons in an orbit
(d) Number of orbitals in an orbit
Ans. (b)

How many electrons can be fit into the orbitals that comprise the 3rd quantum shell n = 3
(a) 2
(b) 8
(c) 18
(d) 32
Ans. (c)

When the azimuthal quantum number has a value of l = 0, the shape of the orbital is
(a) Rectangular
(b) Spherical
(c) Dumbbell
(d) Unsymmetrical
Ans. (b)

Related: Top NITs Colleges in India

For n = 3 energy level, the number of possible orbitals (all kinds) are
(a) 1
(b) 3
(c) 4
(d) 9
Ans. (d)

When 3d orbital is complete, the new electron will enter the
(a) 4p-orbital
(b) 4f-orbital
(c) 4s-orbital
(d) 4d-orbital
Ans. (a)

Pauli’s exclusion principle states that
(a) Two electrons in the same atom can have the same energy
(b) Two electrons in the same atom cannot have the same spin
(c) The electrons tend to occupy different orbitals as far as possible
(d) None of the above
Ans. (d)

The number of radial nodes of 3s and 2p orbitals are respectively.
(a) 2, 0
(b) 0, 2
(c) 1, 2
(d) 2, 1
Ans. (a)

The angular momentum of an electron depends on
(a) Principal quantum number
(b) Azimuthal quantum number
(c) Magnetic quantum number
(d) All of these
Ans. (b)

The maximum energy is present in any electron at
(a) Nucleus
(b) Ground state
(c) First excited state
(d) Infinite distance from the nucleus
Ans. (d)

Related: Career as Agricultural Engineer

The number of orbitals in the fourth principal quantum number will be
(a) 4
(b) 8
(c) 12
(d) 16
Ans. (d)

The two electrons in K sub-shell will differ in
(a) Principal quantum number
(b) Azimuthal quantum number
(c) Magnetic quantum number
(d) Spin quantum number
Ans. (d)

The total number of unpaired electrons in d- orbitals of atoms of element of atomic number 29 is
(a) 10
(b) 1
(c) 0
(d) 5
Ans. (c)

Share with your Friends...
Share on Facebook
Facebook
Tweet about this on Twitter
Twitter
Share on LinkedIn
Linkedin
Pin on Pinterest
Pinterest
Print this page
Print

About the author

Vishal Arora

Leave a Comment