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Structure of Atom — JEE Main & Advanced NSEC PYQs

50 previous year questions from Structure of Atom with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

50 questionsNSECSolutions on every page
1

If the radius of the hydrogen atom is 53 pm , the radius of the He ⁺ ion is close to

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An electron present in the third excited state of a H atom returns to the first excited state and then to the ground state. If ₁ and ₂ are the wavelengths of light emitted in these

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The ratio of the energy of the electron in ground state of hydrogen atom to that of the electron in the first excited state of Be ³⁺ is

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When a certain metal was irradiated with light of frequency 3.2 10¹⁶ ~Hz , the photoelectrons emitted had twice the kinetic energy as did the photoelectrons emitted when the same m

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An orbital among the following that has two radial nodes and two angular nodes is

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Decay of radioisotopes follows first order kinetics. Radioisotope U²³⁸ undergoes decay to a stable isotope, Th ²³⁴ . The ratio of the number of atoms of U ²³⁸ to that of Th ²³⁴ aft

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For which of the following processes, carried out in free space, energy will be absorbed? I. Separating an electron from an electron II. Removing an electron from a neutral atom II

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Which of the following elements will exhibit photoelectric effect with light of the longest wavelength?

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An electron beam can undergo diffraction by crystals which proves the wave nature of electrons. The potential required for a beam of electrons to be accelerated so that its wavelen

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The electrons identified by quantum numbers n and l , (i) n=4, l=1 , (ii) n=4, l=0 , (iii) n=3, l=2 , (iv) n=3, l=1 can be placed in order of increasing energy from lowest to highe

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The statement that is NOT correct about atomic spectra is

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The current produced due to photoelectric effect

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The correct statement/s among the following is/are:

Olympiad workbook Solution View → 14

The plots of energy density (energy per unit area) vs wavelength for blackbody radiation at various temperatures is given below. The correct option among the following is: (i) T ₁>

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The unit of Planck's constant, 'h', is the same as that of

Olympiad workbook Solution View → 16

The kinetic energy of the photoelectrons ejected by a metal surface increased from 0.6 eV to 0.9 eV when the energy of the incident photons was increased by 20 % . The work functio

Olympiad workbook Solution View → 17

An ionic species, M ³⁺ , is isoelectronic with CuCl ₂ and has ( Z +2 ) neutrons. The molar mass of M ³⁺ is

Olympiad workbook Solution View → 18

The property of radiation that is not different at various regions of the electromagnetic spectrum is:

Olympiad workbook Solution View → 19

Maximum number of electrons with m _ s =1 / 2 which can be accommodated in subshells having total three nodes is

Olympiad workbook Solution View → 20

The electronic transition in He ⁺ ion that will occur at the same wavelength as that of the n =2 to n =1 transition in H atom is

Olympiad workbook Solution View → 21

The energy of an electron in the ground state of H atom is -13.6 eV . The negative sign indicates that

Olympiad workbook Solution View → 22

The power and wavelength emitted by a laser pointer commonly used in Power Point presentations are 1.0 mW and 670 nm respectively. Number of photons emitted by this pointer during

Olympiad workbook Solution View → 23

The energy of an electron in Bohr's orbit of hydrogen atom is -13.6 eV . The total electronic energy of a 'hypothetical' He atom in which there are no electron electron repulsions

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The ionization energy of a certain element is 412 ~kJ ~mol ⁻¹ . When the atoms of this element are in the first excited state, however, the ionization energy is only 126 ~kJ ~mol ⁻

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The kinetic energy of an electron that has a wavelength of 10 nm is

Olympiad workbook Solution View → 26

When a certain metal was irradiated with light of frequency 3.2 10¹⁶ ~Hz , the photoelectrons emitted had twice the kinetic energy as did the photoelectrons emitted when the same m

Olympiad workbook Solution View → 27

The electrons identified by quantum numbers n and l , (i) n=4, l=1 , (ii) n=4, l=0 , (iii) n=3, l=2 , (iv) n=3, l=1 can be placed in order of increasing energy from lowest to highe

Olympiad workbook Solution View → 28

The kinetic energy of an electron that has a wavelength of 10 nm is

Olympiad workbook Solution View → 29

An electron beam can undergo diffraction by crystals which proves the wave nature of electrons. The potential required for a beam of electrons to be accelerated so that its wavelen

Olympiad workbook Solution View → 30

The ionization energy of a certain element is 412 ~kJ ~mol ⁻¹ . When the atoms of this element are in the first excited state, however, the ionization energy is only 126 ~kJ ~mol ⁻

Olympiad workbook Solution View → 31

The energy of an electron in Bohr's orbit of hydrogen atom is -13.6 eV . The total electronic energy of a 'hypothetical' He atom in which there are no electron electron repulsions

Olympiad workbook Solution View → 32

The ratio of the energy of the electron in ground state of hydrogen atom to that of the electron in the first excited state of Be ³⁺ is

Olympiad workbook Solution View → 33

The energy of an electron in the ground state of H atom is -13.6 eV . The negative sign indicates that

Olympiad workbook Solution View → 34

Which of the following elements will exhibit photoelectric effect with light of the longest wavelength?

Olympiad workbook Solution View → 35

If the radius of the hydrogen atom is 53 pm , the radius of the He ⁺ ion is close to

Olympiad workbook Solution View → 36

The power and wavelength emitted by a laser pointer commonly used in Power Point presentations are 1.0 mW and 670 nm respectively. Number of photons emitted by this pointer during

Olympiad workbook Solution View → 37

An electron present in the third excited state of a H atom returns to the first excited state and then to the ground state. If ₁ and ₂ are the wavelengths of light emitted in these

Olympiad workbook Solution View → 38

An orbital among the following that has two radial nodes and two angular nodes is

Olympiad workbook Solution View → 39

Decay of radioisotopes follows first order kinetics. Radioisotope U²³⁸ undergoes decay to a stable isotope, Th ²³⁴ . The ratio of the number of atoms of U ²³⁸ to that of Th ²³⁴ aft

Olympiad workbook Solution View → 40

For which of the following processes, carried out in free space, energy will be absorbed? I. Separating an electron from an electron II. Removing an electron from a neutral atom II

Olympiad workbook Solution View → 41

The kinetic energy of the photoelectrons ejected by a metal surface increased from 0.6 eV to 0.9 eV when the energy of the incident photons was increased by 20 % . The work functio

Olympiad workbook Solution View → 42

The unit of Planck's constant, 'h', is the same as that of

Olympiad workbook Solution View → 43

The statement that is NOT correct about atomic spectra is

Olympiad workbook Solution View → 44

The electronic transition in He ⁺ ion that will occur at the same wavelength as that of the n =2 to n =1 transition in H atom is

Olympiad workbook Solution View → 45

An ionic species, M ³⁺ , is isoelectronic with CuCl ₂ and has ( Z +2 ) neutrons. The molar mass of M ³⁺ is

Olympiad workbook Solution View → 46

Maximum number of electrons with m _ s =1 / 2 which can be accommodated in subshells having total three nodes is

Olympiad workbook Solution View → 47

The property of radiation that is not different at various regions of the electromagnetic spectrum is:

Olympiad workbook Solution View → 48

The current produced due to photoelectric effect

Olympiad workbook Solution View → 49

The correct statement/s among the following is/are:

Olympiad workbook Solution View → 50

The plots of energy density (energy per unit area) vs wavelength for blackbody radiation at various temperatures is given below. The correct option among the following is: (i) T ₁>

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