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Explore popular questions from Structure of Atom for JEE Advanced. This collection covers Structure of Atom previous year JEE Advanced questions hand picked by experienced teachers.

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Structure of Atom

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Q 1. The orbital diagram in which the Aufbau principle is violated is:

A

C

D

Explanation

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Q 2. The correct set of quantum numbers for the unpaired electron of chlorine atom is:

A

{tex} n : 2,\ l : 1,\ m : 0{/tex}

B

{tex} n : 2, \ l : 1, \ m : 1 {/tex}

{tex} n : 3 , \ l : 1 , \ m : 1 {/tex}

D

{tex} n : 3 , \ l : 0 , \ m : 0 {/tex}

Explanation

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Q 3. Which of the following does not characterise {tex} X {/tex}-rays?

A

The radiation can ionise gases

B

It causes ZnS to fluorescence

Deflected by electric and magnetic fields

D

Have wavelengths shorter than ultraviolet rays

Explanation

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Q 4. A {tex} 3 p {/tex} orbital has:

A

two non spherical nodes

B

two spherical nodes

one spherical & one non spherical node

D

one spherical and two non spherical nodes

Explanation

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Q 5. If the nitrogen atom has electronic configuration {tex} 1 s ^ { 7 } , {/tex} it would have energy lower than that of the normal ground state configuration {tex} 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 3 } , {/tex} because the electrons would be closer to the nucleus. Yet {tex} 1 s ^ { 7 } {/tex} is not observed because it violates.

A

Heisenberg uncertainty principle

B

Hund's rule

Pauli exclusion principle

D

Bohr postulate of stationary orbits

Explanation

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Q 6.

Beta-emission takes place

A

From the elements above the band of stability

B

When neutron is converted to proton

C

With shifting of the new element one group towards right

Following all the facts given above

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Q 7.

The angular momentum of an electron in 4s orbital, 3p orbital, and 4th orbit are

B

C

D

Explanation

2K, 8L, 9M, and 2N

Structure is

Atomic number 21

The total number of

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Q 8.

Slow neutrons can bring about the fission of

B

C

D

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Q 9.

When passing through a magnetic field the largest deflection is experienced by

A

rays

rays

C

rays

D

All equal

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Q 10.

A radioactive element decays by the sequence, and with half-lives, given below

Which of the following statements about this system are correct?

A

After two hours, less than 10% of the initial is left

B

Maximum amount of present at any time before 30 min is less then 50% of the initial amount of

C

Atomic numbers of and are same

All of the above are correct statements

Explanation

is atomic number of

Half-life period of

Total time

number of half-lives

left after 4 half-lives

Thus, (a) is true

Before 30 min ( = half-life) amount of left > 50%

Hence, formed < 50%

(since half-life of ) is 2880 min >> half-life of )

Thus, (b) is correct

and are isotopes with same atomic number thus, (c) is correct

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Q 11.

captures a K electron into its nucleus. What is the mass number and atomic number of the nuclide formed?

3,7

B

4,8

C

3,8

D

4,7

Explanation

So, atomic number=3, mass number=7

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Q 12.

When electronic transition occurs from higher energy state to lower energy state with energy difference equal to electron volts, the wavelength of the line emitted is approximately equal to

B

C

D

Explanation

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Q 13.

Which of the following nuclei is unstable?

A

C

D

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Q 14.

Thiosulphate ion, on acidification changes to along with precipitation of sulphur

Which is the correct statement?

is in sulphur

B

is in

C

is in both

D

is in none

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Q 15.

The electrons, identified by quantum numbers and

  • Can be placed in the order of increasing energy, from the lowest to highest, as

    B

    C

    D

    Explanation

    According to Aufbau’s principle, filling of electrons in various subshells of an atom takes place in the increasing order of energy, starting with the lower most

    The following order is observed:

    According to Bohr-Bury rule, rule, the subshell with the lower value of is filled first. If the values for are equal, the one with the smaller value of is filled first


    i.

    4

    1

    5

    ii.

    4

    0

    4

    iii.

    3

    2

    5

    iv.

    3

    1

    4



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    Q 16.

    After the emission of a particle followed by particle from the number of neutrons in the atom is

    A

    130

    B

    129

    128

    D

    127

    Explanation

    Neutron

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    Q 17.

    In the Schrodinger’s wave equation represents

    A

    Orbit

    Wave function

    C

    Wave

    D

    Radial probability

    Explanation

    =wave function

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    Q 18.

    Which of the following has the maximum penetrating power?

    A

    particle

    B

    Proton

    particle

    D

    Positron

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    Q 19.

    Which of the following projectiles is the best for bombarding the nuclide?

    A

    particle

    B

    Proton

    C

    Deuteron

    Neutron

    Explanation

    Neutron is the best projectile

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    Q 20.

    Which of the following is false?

    A

    The energy of an electron in an orbital of a hydrogen-like species depends only on the principal quantum number

    The angular momentum of an electron of an orbital of a multielectron atom depends on the quantum numbers and

    C

    The expression of angular momentum of an electron in an orbital is given as

    D

    The -component of angular momentum of an electron in an orbital is given as

    Explanation

  • True

  • False. The angular momentum depends only on the azimuthal quantum number

  • True

  • True

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    Q 21.

    Which of the following elements belongs to -series?

    A

    Pb-207

    B

    Bi-209

    Pb-208

    D

    Pb-206

    Explanation

    Pb-208 belongs to series

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    Q 22.

    The radius of second Bohr’s orbit is

    A

    0.053 nm

    B

    nm

    D

    nm

    Explanation

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    Q 23.

    Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

    A

    Low ionization energy of sodium

    B

    Sublimation of metallic sodium to give yellow vapour

    Emission of excess energy absorbed as a radiation in the visible region

    D

    Photosensitivity of sodium

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    Q 24.

    When ratio of an isotope is greater than the stable isotope of that element, it emits

    particles

    B

    particles

    C

    Neutron

    D

    Positron

    Explanation

    Isotope must have some number of proton, therefore -particle will be emitted

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    Q 25.

    The electronic configuration of a diapositive ion is 2, 8,14 and its mass number is 56. The number of neutrons present is

    A

    32

    B

    42

    30

    D

    34

    Explanation

    Electronic configuration of

    Since two has been lost in forming ion from metal, so total number of protons should be

    Hence, number of neutrons