At temperature T , the average kinetic energy of any particle is 3 2 kT . The de Broglie wavelength follows the order:

Visible photon > thermal electron > thermal neutron.

Thermal neutron > visible photon > thermal electron.

Thermal neutron > thermal electron > visible photon.

Visible photon > thermal neutron > thermal electron.

HARD

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An electron is continuously accelerated in vacuum tube by applying potential difference. If its de-Broglie wavelength is decreased by 1%, the change in kinetic energy of the electron is nearly:

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Important Questions on Atomic Structure

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The quantum number of four electrons are given below:

I . n = 4, l = 2, m_{l} = - 2, m_{s} = - 1 / 2

I I . n = 3, l = 2, m_{l} = 1, m_{s} = + 1 / 2

I I I . n = 4, l = 1, m_{l} = 0, m_{s} = + 1 / 2

I V . n = 3, l = 1, m_{l} = 1, m_{s} = - 1 / 2

The correct order of their increasing energies will be:

HARD

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Maximum number of electrons that can be accommodated in the subshell with azimuthal quantum number

l = 4

is.

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

A stream of electrons from a heat filament was passed between two charge plates kept at a potential difference

V esu

. If

e

and

m

are charge and mass of an electron, respectively, then the value of

\frac{h}{λ}

(where

λ

is wavelength associated with the electron wave) is given by:

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect? (The Bohr radius is represented by

a_{0}

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The correct set of four quantum numbers for the valence electrons of rubidium atom

(Z = 37)

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Among the following, the energy of

2 s

orbital is lowest in:

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

C_{60}

emerging from a source at a speed (v) has a de Broglie wavelength of

11.0 Å

. The value of v (in m

s^{- 1}

) is closest to

[Planck's constant

h = 6.626 \times 10^{- 34} J s

]

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The de Broglie wavelength of an electron in the

4^{t h}

Bohr's orbit of hydrogen is:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

For a 4p orbital, the number of radial and angular nodes, respectively, are

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The angular momentum of electron in

d

-orbital is equal to

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The graph between

{|ψ|}^{2}

and

r

(radical distance) is shown below. This represents:
Question Image

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals?

(A)

An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum.

(B)

For a given value of the principal quantum number, the size of the orbit is inversely proportional to the azimuthal quantum number.

(C)

According to wave mechanics, the ground state angular momentum is equal to

\frac{h}{2 π}

(D)

The plot of

ψ

r

for various azimuthal quantum numbers, shows peak shifting towards higher

r

value.

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

What is the maximum number of orbitals that can be identified with the following quantum number

n = 3, l = 1, m = 0

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The electrons are more likely to be found:
Question Image

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The number of orbitals associated with quantum numbers

n = 5, m_{s} = + \frac{1}{2}

is:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

The number of subshells associated with

n = 4

and

m = - 2

quantum numbers is:

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Two particles

A

and

B

are in motion. If the wavelength associated with

A

33.33 nm

, the wavelength associated with

B

whose momentum is

\frac{1}{3} rd

A

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Which of the following pairs of

d -

orbitals will have the electron density along the axis?

MEDIUM

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

At temperature

T

, the average kinetic energy of any particle is

\frac{3}{2} kT

. The de Broglie wavelength follows the order:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Bohr’s model of atom

Two electrons occupying the same orbital are distinguished by:

An electron is continuously accelerated in vacuum tube by applying potential difference. If its de-Broglie wavelength is decreased by 1%, the change in kinetic energy of the electron is nearly:

Important Questions on Atomic Structure

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