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.

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The de Broglie wavelength of electron of ${He}^{+}$ ion is $3.329 Å$ . If the photon emitted upon de-excitation of this ${He}^{+}$ ion is made to hit H-atom in its ground state to liberate electron from it, then de Broglie's wavelength of photoelectron is $λ$ . What will be the value of $20 λ$ in $Å$ ?

Round off your answer to the nearest integer.

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Important Questions on Atomic Structure

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the 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>Quantum Mechanical Model of the Atom

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

l = 4

is.

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the 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:

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the 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}

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

(Z = 37)

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

Among the following, the energy of

2 s

orbital is lowest in:

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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>Quantum Mechanical Model of the 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>Quantum Mechanical Model of the Atom

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

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

The angular momentum of electron in

d

-orbital is equal to

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

The graph between

{|ψ|}^{2}

and

r

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

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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>Quantum Mechanical Model of the Atom

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

n = 3, l = 1, m = 0

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

The electrons are more likely to be found:
Question Image

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

The number of orbitals associated with quantum numbers

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

is:

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

The number of subshells associated with

n = 4

and

m = - 2

quantum numbers is:

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the 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

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

Which of the following pairs of

d -

orbitals will have the electron density along the axis?

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

At temperature

T

, the average kinetic energy of any particle is

\frac{3}{2} kT

. The de Broglie wavelength follows the order:

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Chemistry>Physical Chemistry>Atomic Structure>Quantum Mechanical Model of the Atom

Two electrons occupying the same orbital are distinguished by:

Important Questions on Atomic Structure

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