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Structure of Atom — NEET UG Chemistry PYQs

785 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.

785 questionsChemistrySolutions on every page
1

Identify the pair of atoms of elements as isotones from the following.

MHT CET Medical 2026 Solution View → 2

Which of the following elements has an electronic configuration, [ Ar ] 4s^2 ?

MHT CET Medical 2026 Solution View → 3

Calculate the energy per mole of photons of red light with a wavelength 750 nm. [ h = 6.626 10⁻³⁴ Js, C = 3 10^8 m/s.]

MHT CET Medical 2026 Solution View → 4

Calculate the energy associated with an electron in the first orbit of hydrogen atom?

MHT CET Medical 2026 Solution View → 5

Find the wave number of the 4^ th line in the Lyman series of H spectrum. (R = Rydberg constant)

MHT CET Medical 2026 Solution View → 6

Calculate the de-Broglie wavelength of an electron having velocity 1000 ms ⁻¹ [ h = 6.626 10⁻³⁴ js , mass of an electron = 9.1 10⁻³¹ kg ]

MHT CET Medical 2026 Solution View → 7

How many total number of s and p electrons are respectively present in Cl ^- ?

MHT CET Medical 2026 Solution View → 8

Visible light has a wavelength of 700 nm. Calculate its frequency in hertz.

MHT CET Medical 2026 Solution View → 9

Calculate the wavelength, wavenumber of photon having its energy 8.0 10⁻¹⁹ J . [h = 6.626 10⁻³⁴ J s , C = 3.0 10^8 m s ⁻¹]

MHT CET Medical 2026 Solution View → 10

Which of the following representation of atomic orbitals is CORRECT regarding dependance of orbital energy on (n+l) rule?

MHT CET Medical 2026 Solution View → 11

Identify a correct set of quantum numbers that represents the highest energy of an electron in an orbital from following.

MHT CET Medical 2026 Solution View → 12

What is the total number of electrons present in completely filled 3s, 3p, and 3d subshell having same value of magnetic quantum number?

MHT CET Medical 2026 Solution View → 13

A bulb is rated at 150 watt, converting 8 % energy into light. If energy of one photon is 4.42 10⁻¹⁹ J, how many photons are emitted by the bulb per second ?

NEET 2026 Solution View → 14

Consider the following schematic plots of orbital wavefunction ( _r ) against distance ( r ) from the nucleus. The figure representing two radial nodes in the orbital is

NEET 2026 Solution View → 15

Match List I with List II : List I (Quantum Numbers) List II (Orbital) 'n' 'l' A. 2 1 I. 3d B. 4 0 II. 2p C. 5 3 III. 4s D. 3 2 IV. 5f Choose the correct answer from the options gi

NEET 2026 Solution View → 16

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n =2 n =3 and n =4 n =6 transitions, respectively, is

NEET 2025 Solution View → 17

Energy and radius of first Bohr orbit of He ⁺ and Li ²⁺ are [Given R _ H =2.18 10⁻¹⁸ ~J , a ₀=52.9 pm ]

NEET 2025 Solution View → 18

Given below are two statements: Statement I: The Balmer spectral line for H atom with lowest energy is locateld at 5 36 R_H ~cm ⁻¹ . ( R _ H = . Rydberg constant ) Statement II: Wh

NEET 2024 Solution View → 19

The quantum numbers of four electrons are given below : I. n=4 ; I=2 ; m₁=-2 ; s=- 1 2 II. n=3 ; I=2 ; m₁=1 ; s=+ 1 2 III. n=4 ; I=1 ; m₁=0 ; s=+ 1 2 IV. n=3 ; I=1 ; m₁=-1 ; s=+ 1

NEET 2024 Solution View → 20

The energy of an electron in the ground state (n=1) for He ⁺ ion is -x J , then that for an electron in n=2 state for Be ³⁺ ion in J is

NEET 2024 Solution View → 21

Match List I with List II Choose the correct answer from the options given below :

NEET 2024 Solution View → 22

Given below are two statements : Statement I : The value of wave function, depends upon the coordinates of the electron in the atom. Statement II : The probability of finding an el

NEET 2023 Solution View → 23

Incorrect set of quantum numbers from the following is

NEET 2023 Solution View → 24

Select the correct statements from the following : A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is 9 . 10939   ×  

NEET 2023 Solution View → 25

A bulb is emitted electromagnetic radiation of 660 ~nm wavelength. The total energy of radiation is 3 10⁻¹⁸ ~J . The number of emitted photons will be (h=6.6 10⁻³⁴ ~J ~s , c=3 10^8

AIIMS 2019 Solution View → 26

Assertion : The chemical properties of different isotopes are same. Reason: Isotopes have same number of neutrons.

AIIMS 2019 Solution View → 27

If n=2 for He ⁺ ion then find out the wave length.

AIIMS 2019 Solution View → 28

Assertion : The free gaseous Cr atom has six unpaired electrons. Reason : Half-filled s -orbital has greater stability.

AIIMS 2019 Solution View → 29

If two atoms have equal number of electron, it is called

JIPMER 2019 Solution View → 30

Which of the following is not iso electronic with H ₂ ~S ?

JIPMER 2019 Solution View → 31

Azimuthal quantum number ( ) defined

JIPMER 2019 Solution View → 32

¹⁹ F ⁻¹,~ ¹⁶ O ⁻²,~ ²⁰ Ne choose the correct statement

JIPMER 2019 Solution View → 33

Hund's rule state that

JIPMER 2019 Solution View → 34

Wavelength of a particular transition for H atom is 400 ~nm . What can be the wavelength of He ⁺ for the same transition?

AIIMS 2018 Solution View → 35

The position of both an electron and helium atom is known within 1.0 ~nm . The momentum of the electron is known within 5.0 10⁻²⁶ ~kg ~m ~s ⁻¹ . The minimum uncertainty in the meas

AIIMS 2018 Solution View → 36

What is the maximum wavelength of line of Balmer series of hydrogen spectrum? (R=1.09 10^7 ~m ⁻¹ )

AIIMS 2018 Solution View → 37

Calculate the velocity of an electron placed in the second orbit of Li ²⁺ ion.

AIIMS 2018 Solution View → 38

In the P ³⁻, S ²⁻ and Cl ⁻ ions, the increasing order of size is

AIIMS 2018 Solution View → 39

Assertion : Fine lines are observed in spectra if an atom is placed in a magnetic field. Reason : Degenerate orbitals split in the presence of magnetic field.

AIIMS 2018 Solution View → 40

Number of photons emitted by a 100 ~W ( Js ⁻¹ ) yellow lamp in 1.0 s is ( of yellow light is 560 nm )

JIPMER 2018 Solution View → 41

Ionisation potential of hydrogen atom is 13.6 eV . Hydrogen atom in ground state is excited by monochromatic light of energy 12.1 eV . The spectral lines emitted by hydrogen accord

AIIMS 2017 Solution View → 42

The AsF ₅ molecule is trigonal bipyramidal. The hybrid orbitals used by the As atoms for bonding are

AIIMS 2017 Solution View → 43

Among the following set of quantum numbers, the impossible set is

JIPMER 2017 Solution View → 44

Match the type of series given in Column I with the wavelength range given in Column II and choose the correct option.

JIPMER 2017 Solution View → 45

The electrons identified by quantum numbers n and l , are as follows I. n=4, l=1 II. n=4, l=0 III. n=3, l=2 IV. n=3, l=1 If we arrange them in order of increasing energy, i.e. from

JIPMER 2017 Solution View → 46

According to Bohr's theory, which of the following correctly represents the variation of energy and radius of an electron in n^ th orbit of H -atom?

AIIMS 2016 Solution View → 47

Assertion : For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of Z . Reason : Electronegativity decreases across a period.

AIIMS 2016 Solution View → 48

Match the particle with its characteristic. array ll|ll & Column I & & Column II A. & -particle & (p) & Slow moving B. & Isobar & (q) & High penetration power C. & -ray & (r) & Sam

JIPMER 2016 Solution View → 49

What will be the number of waves formed by a Bohr electron in one complete revolution in its second orbit?

JIPMER 2016 Solution View → 50

The effective neutron capture radius of a nucleus having a cross-section of 1.0 barr is [Given, 1 barr =1.0 10⁻²⁴ ~cm ^2 ]

JIPMER 2016 Solution View → 51

-Particles can be detected by using

AIIMS 2015 Solution View → 52

Which of the following arrangement is possible? array llll n & l & m & s array

AIIMS 2015 Solution View → 53

Assertion : For Balmer series of hydrogen spectrum, the value n₁=2 and n₂=3,4,5 . Reason : The value of n₂ for a line in Balmer series of hydrogen spectrum having the highest wavel

AIIMS 2015 Solution View → 54

In an atom, an electron is moving with a speed of 600 ~m / s with an accuracy of 0.005 % . Certainty with which the position of the electron can be located is (Given, h=6.6 10⁻³⁴ ~

JIPMER 2015 Solution View → 55

The Vividh Bharti Station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (Kilohertz). Calculate the wavelength ( ) of the electromagnetic radiation emitted by tr

JIPMER 2015 Solution View → 56

Choose the correctly paired gaseous cation and its magnetic (spin only) moment (in B.M.)

AIIMS 2014 Solution View → 57

Which of the following pairs represent isotones?

AIIMS 2014 Solution View → 58

Assertion: Co ( IV ) is known but Ni ( IV ) is not. Reason : Ni ( IV ) has d^4 electronic configuration.

AIIMS 2014 Solution View → 59

An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is . What is the circumference of the fourth orbit?

JIPMER 2014 Solution View → 60

If n=6 , the correct sequence for filling of electrons will be

JIPMER 2014 Solution View → 61

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 10⁻⁴ , then particle is

AIIMS 2013 Solution View → 62

Assertion : Number of radial and angular nodes for 3 p -orbital are 1,1 respectively. Reason : Number of radial and angular nodes depends only on principal quantum number.

AIIMS 2013 Solution View → 63

Maximum number of electrons in a subshell of an atom determined by the following?

JIPMER 2013 Solution View → 64

Assertion : Bohr model fails in case of multielectron species. Reason : It does not mention electron-electron interactions.

AIIMS 2012 Solution View → 65

Assertion : The spectrum of He ⁺ is expected to be similar to that of hydrogen. Reason : He ⁺ is also one electron system.

AIIMS 2012 Solution View → 66

Threshold frequency of a metal is 5 10¹³ ~s ⁻¹ upon which 1 10¹⁴ ~s ⁻¹ frequency light is focused. Then the maximum kinetic energy of emitted electron is

AIIMS 2012 Solution View → 67

In Bohr's orbit, n h 2 indicates

AIIMS 2012 Solution View → 68

Which one of the following sets of quantum numbers represents the highest energy level in an atom?

JIPMER 2012 Solution View → 69

The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is

JIPMER 2012 Solution View → 70

Smallest wavelength occurs for

AIIMS 2011 Solution View → 71

Which of the following is wrong for Bohr model?

AIIMS 2011 Solution View → 72

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm . How many photons are emitted from the lamp per second? (h=6.626 10⁻³⁴ ~J - s . ; velocity of light .=3 1

JIPMER 2011 Solution View → 73

The number of electrons, neutrons and protons in a species are equal to 10,8 and 8 respectively. The proper symbol of the species is

JIPMER 2011 Solution View → 74

Assume that you are travelling at a speed of 90 ~km / h in a small car with a mass of 1050 ~kg . If the uncertainty in the velocity of the car is 1 %( v=0.9 ~km / h ) , what is the

AIIMS 2010 Solution View → 75

Assertion : The nuclear isomers are the atoms with the same atomic number and same mass number, but with different radioactive properties. Reason : The nucleus in the excited state

AIIMS 2010 Solution View → 76

Assertion : S.I. unit of atomic mass and molecular mass is kilograms. Reason : Atomic mass is equal to the mass of 6.023 10²⁴ atoms.

AIIMS 2010 Solution View → 77

Which of the following configurations corresponds to element of highest ionisation energy?

JIPMER 2010 Solution View → 78

The quantum numbers + 1 2 and - 1 2 for the electron spin represent

JIPMER 2010 Solution View → 79

What is the wavelength (in m ) of a particle of mass 6.62 10⁻²⁹ ~g moving with a velocity of 10^3 ~ms ⁻¹ ?

JIPMER 2009 Solution View → 80

What is the wave number of 4^ th line in Balmer series of hydrogen spectrum? (R=1,09,677 ~cm ⁻¹ . )

JIPMER 2009 Solution View → 81

What are the values of n₁ and n₂ respectively for H _ line in the Lyman series of hydrogen atomic spectrum 44 ?

JIPMER 2009 Solution View → 82

The total number of orbitals in the fifth energy level is

JIPMER 2009 Solution View → 83

The atomic number of an element ' M ' is 26. How many electrons are present in the M -shell of the element in its M³⁺ state ?

JIPMER 2009 Solution View → 84

Assertion : The quantized energy of an electron is largely determined by its principal quantum number. Reason : The principal quantum number (n ) is a measure of the most probable

AIIMS 2008 Solution View → 85

The de-Broglie wavelenght of a particle with mass 1 kg and velocity (100 ~m / s ) is

JIPMER 2008 Solution View → 86

Neutron is discovered by

JIPMER 2008 Solution View → 87

Heisenberg uncertainty principle can be explained as

JIPMER 2008 Solution View → 88

Which of the following radioisotopes is used as anticancerous?

AIIMS 2007 Solution View → 89

The compound used in enrichment of uranium for nuclear power plant is

AIIMS 2006 Solution View → 90

The de Broglie wavelength associated with a ball of mass 1 ~kg having kinetic energy 0.5 ~J is

AIIMS 2006 Solution View → 91

Cr is member of 3 d transition series of atomic number 24. What will be its electronic configuration?

JIPMER 2006 Solution View → 92

If magnetic quantum number of a given atom represented by -3 , then what will be its principal quantum number?

JIPMER 2006 Solution View → 93

₉₂²³⁸ U emits 8 -particles and 6 -particles. The neutron/proton ratio in the product nucleus is

AIIMS 2005 Solution View → 94

The isoelectronic pair is

AIIMS 2005 Solution View → 95

-Particles can be detected using

AIIMS 2005 Solution View → 96

The most probable radius (in pm) for finding the electron in He ⁺ is

AIIMS 2005 Solution View → 97

Dual nature of particle was-given by

JIPMER 2005 Solution View → 98

Number of orbitals in L energy level

JIPMER 2005 Solution View → 99

Ratio of radii of second and first Bohr orbits of H atom is

JIPMER 2005 Solution View → 100

For principle quantum number n=4 , the total number of orbitals having l=3 is

AIIMS 2004 Solution View → 101

Assertion : The free gaseous Cr atom has six unpaired electrons. Reason : Half-filled s orbital has greater stability.

AIIMS 2004 Solution View → 102

Assertion : Nuclear binding energy per nucleon is in the order - ₄^9 Be > ₃^7 Li > ₂^4 He . Reason : Binding energy per nucleon increases linearly with difference in number of neut

AIIMS 2004 Solution View → 103

A golf-ball weigh 40.0 g . If it is moving with a velocity of 20.0 ~ms ⁻¹ , it's de-Broglie wavelength is

JIPMER 2004 Solution View → 104

The shape of an orbital is determined by

JIPMER 2004 Solution View → 105

Which of the following ions, has smallest size?

JIPMER 2004 Solution View → 106

An element ' Y ' emits one -and two -particles to give ' X '. X and Y are

JIPMER 2004 Solution View → 107

Which is the shortest wavelength line in the Lyman series of the hydrogen spectrum? ( R=1.097 10⁻² ~nm ⁻¹ )

JIPMER 2004 Solution View → 108

The frequency radiation emitted when the electron falls from n =4 to n=1 in a hydrogen atom will be (Given ionization energy of H =2.18 10⁻¹⁸ ~J atom ⁻¹ and h .=6.625 10⁻³⁴ Js ) :

NEET 2004 Solution View → 109

The quantum number m of a free gas eous atom is associated with

AIIMS 2003 Solution View → 110

Assertion : ₁₁²² Mg emits a positron giving 22 12 Mg . Reason : In ⁺ emission neutron is transformed into proton.

AIIMS 2003 Solution View → 111

The ions O ²⁻, F ⁻, Na ⁺, Mg ²⁺ and Al ³⁺ are isoelectronic. Their ionic radii show:

NEET 2003 Solution View → 112

The value of Planck's constant is 6.63 10⁻³⁴ Js . The velocity of light is 3.0 10^8 ~ms ⁻¹ . Which value is closest to the wavelength in nanometers of quantum of light with frequen

NEET 2003 Solution View → 113

Quantum numbers of an atom can be defined on the basis of

AIIMS 2002 Solution View → 114

Which of the following has maximum energy?

AIIMS 2002 Solution View → 115

Azimuthal quantum number defines

AIIMS 2002 Solution View → 116

Which of the following does not have valence electron in 3 d -subshell?

AIIMS 2002 Solution View → 117

Assertion : Absorption spectrum consists of some bright lines separated by dark spaces. Reason : Emission spectrum consists of dark lines.

AIIMS 2002 Solution View → 118

Assertion : For Balmer series of hydrogen spectrum, the value n₁=2 and n₂=3,4,5 . Reason: The value of n for a line in Balmer series of hydrogen spectrum having the highest wavelen

AIIMS 2002 Solution View → 119

Spectrum of Li ²⁺ is similar to that of

AIIMS 2002 Solution View → 120

Which of the following is isoelectronic?

NEET 2002 Solution View →
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