NEW
New Website Launch
Experience the best way to solve previous year questions with mock tests (very detailed analysis), bookmark your favourite questions, practice etc...
VISIT NOW

JEE Advanced

Structure of Atom

Chemistry

Previous Years Questions

Numerical

More
Consider a helium (He) atom that absorbs a photon of wavelength 330 nm. The change in the velocity (in cm s$$-$$1) of He...
JEE Advanced 2021 Paper 2 Online
The figure below is the plot of potential energy versus internuclear distance (d) of H2 molecule in the electronic groun...
JEE Advanced 2020 Paper 2 Offline
Not considering the electronic spin, the degeneracy of the second excited state( n = 3) of H atom is 9, while the degene...
JEE Advanced 2015 Paper 1 Offline
In an atom, the total number of electrons having quantum numbers n = 4, |ml| = 1 and ms = –1/2 is
JEE Advanced 2014 Paper 1 Offline
The atomic masses of He and Ne are 4 and 20 a.m.u., respectively. The value of the de Broglie wavelength of He gas at –7...
JEE Advanced 2013 Paper 1 Offline
The work function ( φ ) of some metals is listed below. The number of metals which will show photoelectric effect when l...
IIT-JEE 2011 Paper 1 Offline
The maximum number of electrons that can have principal quantum number, n = 3, and spin quantum number, ms = − 1/2 , is...
IIT-JEE 2011 Paper 1 Offline
Find out the number of waves made by a Bohr electron in once complete revolution in its 3rd orbit?
IIT-JEE 1994
What is the maximum number of electrons that may be present in all atomic orbitals with principal quantum number 3 and a...
IIT-JEE 1985

MCQ (Single Correct Answer)

More
Consider the Bohr's model of a one-electron atom where the electron moves around the nucleus. In the following List-I co...
JEE Advanced 2019 Paper 2 Offline
Consider the Bohr's model of a one-electron atom where the electron moves around the nucleus. In the following List-I co...
JEE Advanced 2019 Paper 2 Offline
For the given orbital in Column 1, the only CORRECT combination for any hydrogen-like species is
JEE Advanced 2017 Paper 1 Offline
For hydrogen atom, the only CORRECT combination is
JEE Advanced 2017 Paper 1 Offline
For $$H{e^ + }$$ ion, the only INCORRECT combination is
JEE Advanced 2017 Paper 1 Offline
P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at...
JEE Advanced 2016 Paper 1 Offline
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$$\alpha_0$$ is Bohr radius]
IIT-JEE 2012 Paper 1 Offline
The hydrogen like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion...
IIT-JEE 2010 Paper 2 Offline
The hydrogen like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion...
IIT-JEE 2010 Paper 2 Offline
The hydrogen like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion...
IIT-JEE 2010 Paper 2 Offline
Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively...
IIT-JEE 2009 Screening
STATEMENT - 1 : The plot of atomic number (y-axis) versus number of neutrons (x-axis) for stable nuclei shows a curvatur...
IIT-JEE 2008
Match the entries with column I with with the correctly related quantum number(s) in Column II. Column I (A) Orbital an...
IIT-JEE 2008
This question contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason) and has 4 choices (a), (b), (c), (d) out of whic...
IIT-JEE 2007
According to Bohr's theory En = Total energy, Kn = Kinetic Energy, Vn = Potential Energy, rn = Radius of nth orbit Mat...
IIT-JEE 2006
The number of radial nodes of 3s and 2p orbitals are respectively
IIT-JEE 2005 Screening
The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom?
IIT-JEE 2004 Screening
If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state c...
IIT-JEE 2002 Screening
Rutherford's experiment, which established the nuclear model of the atom, used a beam of
IIT-JEE 2002 Screening
The quantum numbers +1/2 and -1/2 for the electron spin represent
IIT-JEE 2001 Screening
The wavelength associated with a golf ball weighing 200 g and moving at speed of 5 m/h is of the order
IIT-JEE 2001 Screening
The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p6 3d5, 4s1 This represents its...
IIT-JEE 2000 Screening
The number of nodal planes in a px orbital is
IIT-JEE 2000 Screening
The electrons, identified by quantum numbers n and l, (i) n = 4, l = 1, (ii) n = 4, l = 0, (iii) n = 3, l = 2 and (iv) n...
IIT-JEE 1999
ASSERTION: Nuclide $${}_{13}^{30}Al$$ is less stable than $${}_{20}^{40}Ca$$ REASON: Nuclides having odd number of proto...
IIT-JEE 1998
The orbital diagram in which the Aufbau principle is violated is
IIT-JEE 1998
For a d-electron the orbital angular momentum is
IIT-JEE 1997
The orbital angular momentum of an electron in 2s orbital is
IIT-JEE 1996
A 3p orbital has
IIT-JEE 1995 Screening
Which of the following does not characterise X-rays?
IIT-JEE 1992
Which of the following relates to photons both as wave motion and as a stream of particles?
IIT-JEE 1992
The correct ground state electronic configuration of chromium atom is
IIT-JEE 1989
The correct set of quantum numbers for the unpaired electron of chlorine atom is
IIT-JEE 1989
The outermost electronic configuration of the most electronegative element is
IIT-JEE 1988
The wavelength of a spectral line for an electronic transition is inversely related to :
IIT-JEE 1988
The triad of nuclei that is isotonic is
IIT-JEE 1988
The ratio of the energy of a photon of 2000Å wavelength to that 4000Å radiation is
IIT-JEE 1986
Which one of the following sets of quantum numbers represents an impossible arrangement?
IIT-JEE 1986
Rutherford's alpha particle scattering experiment eventually led to the conclusion that:
IIT-JEE 1986
Electromangnetic radiation with maximum wavelength is:
IIT-JEE 1985
The radius of an atomic nucleus is of the order of
IIT-JEE 1985
Bohr Model can explain
IIT-JEE 1985
Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?
IIT-JEE 1984
Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is
IIT-JEE 1984
The increasing order (lowest first) for the values of e/m (charges/mass) for electron (e), proton (p), neutron (n) and ...
IIT-JEE 1984
Rutherford's scattering experiment is related to the size of the
IIT-JEE 1983
Any p-orbital can accommodate upto
IIT-JEE 1983
The principal quantum number of an atom is related to the
IIT-JEE 1983
Rutherford's experiment on scattering of $$\alpha-particles$$ showed for the first time that the atom has
IIT-JEE 1981
The number of neutrons in dipositive zinc ion with mass number 70 is
IIT-JEE 1979

MCQ (More than One Correct Answer)

More
The ground state energy of hydrogen atom is $$-$$13.6 eV. Consider an electronic state $$\psi $$ of He+ whose energy, az...
JEE Advanced 2019 Paper 2 Offline
Which of the following statement(s) is(are) correct regarding the root mean square speed (Urms) and average translationa...
JEE Advanced 2019 Paper 1 Offline
Ground state electronic configuration of nitrogen atom can be represented by
IIT-JEE 1999
The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. The possible energy value(s) of the excited sta...
IIT-JEE 1998
Which of the following statement(s) is (are) correct?
IIT-JEE 1998
Decrease in atomic number is observed during
IIT-JEE 1998
The sum of the number of neutrons and proton in the isotope of hydrogen is
IIT-JEE 1986
Many elements have non-integral atomic masses because:
IIT-JEE 1984
When alpha particles are sent through a thin metal foil, most of them go straight through the foil because
IIT-JEE 1984
An isotone of $${}_{32}^{76}Ge$$ is
IIT-JEE 1984

Subjective

More
Find the velocity (ms-1) of electron in first Bohr's orbit of radius a0. Also find the de Broglie's wavelength (in m). ...
IIT-JEE 2005
A ball of mass 100 g is moving with 100 ms-1. Find it's wavelength.
IIT-JEE 2004
(a) The Schrodinger wave equation for hydrogen atom is $$$\psi = {1 \over {4\sqrt {2\pi } }}{\left( {{1 \over {{a_0}}}}...
IIT-JEE 2004
Wavelength of high energy transition of H-atoms is 91.2 nm. Calculate the corresponding wavelength of He atoms.
IIT-JEE 2003
Calculate the energy required to excite one litre of hydrogen gas at 1 atm and 298 K to the first excited state of atomi...
IIT-JEE 2000
Consider the hydrogen atom to be a proton embedded in a cavity of radius a0 (Bohr radius) whose charge is neutralised by...
IIT-JEE 1996
Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen.
IIT-JEE 1996
Iodine molecule dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each ...
IIT-JEE 1995
What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n = 4 to n = 2 of He+ s...
IIT-JEE 1993
Estimate the difference in energy between 1st and 2nd Bohr orbit for a hydrogen atom. At what minimum atomic number, a t...
IIT-JEE 1993
According to Bohr's theory, the electronic energy of hydrogen atom in the nth Bohr's orbit is given by $${E_n} = {{ - 21...
IIT-JEE 1990
Give reasons why the ground state outermost electronic configuration of silicon is: ...
IIT-JEE 1985
The electron energy in hydrogen atom is given by E = (-21.7 $$\times$$ 10-12)/n2 ergs. Calculate the energy required to ...
IIT-JEE 1984
Calculate the wavelength in Angstrom of the photon that is emitted when an electron in the Bohr orbit, n = 2 returns to ...
IIT-JEE 1982
The energy of the electron in the second and the third Bohr's orbits of the hydrogen atom is -5.42 $$\times$$ 10-12 erg ...
IIT-JEE 1981

Fill in the Blanks

More
The outermost electronic configuration of Cr is _______.
IIT-JEE 1994
The 2px, 2py and 2pz orbitals of atom have identical shapes but differ in their _____.
IIT-JEE 1993
Wave functions of electrons in atoms and molecules are called ______.
IIT-JEE 1993
The light radiations with discrete quantities of energy are called ______.
IIT-JEE 1993
The uncertainty principle and the concept of wave nature of matter were proposed by ______ and ______ respectively. (Hei...
IIT-JEE 1988
Elements of the same mass number but of different atomic numbers are known as ____.
IIT-JEE 1983
When there are two electrons in the same orbital, they have _____ spins.
IIT-JEE 1982
Isotopes of an element differ in the number of ______ in their nuclei.
IIT-JEE 1982
The mass of a hydrogen atom is ______ kg.
IIT-JEE 1982

True or False

More
In a given electric field, $$\beta-particles $$ are deflected more than $$\alpha-particles$$ in spite of $$\alpha-partic...
IIT-JEE 1993
The electron density in the XY plane in 3dx2 - y2 orbital is zero
IIT-JEE 1986
The energy of the electron in the 3d-orbital is less than that in the 4s-orbital in the hydrogen atom.
IIT-JEE 1983
Gamma rays are electromagnetic radiations of wavelengths of 10-6 to 10-5 cm
IIT-JEE 1983
The outer electronic configuration of the ground state chromium atom is 3d4 4s2
IIT-JEE 1982

Joint Entrance Examination

JEE Main JEE Advanced WB JEE

Graduate Aptitude Test in Engineering

GATE CSE GATE ECE GATE EE GATE ME GATE CE GATE PI GATE IN

Medical

NEET

CBSE

Class 12