Atomic Structure — practice questions

155 curated practice questions from Atomic Structure (Chemistry JEE Advanced, NTA Exams) — 120 hard, 35 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.

• If the radius of first Bohr’s orbit of H-atom is x, which of the following is the correct conclusion ?
• The correct ground state electronic configuration of chromium atom is (1989)
• For He + ion, the only INCORRECT combination is For 2 ~s orbital no. of radial nodes = n -l-1=1 (2018)
• The ionisation energy of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic…
• The hydrogen-like species Li 2 + is in a spherically symmetric state S 1 with one radial node. Upon absorbing light the…
• Assertion (A) : Charge Mass ratio of anode rays is found different for different gases. Reason : Proton is the…
• In the following two figures, ( ^ 2 ) is plotted against (r) the distance from nucleus :
• The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is
• Ratio of frequency of revolution of electron in the 2 nd excited state of He + and 2 nd state of hydrogen is
• In any subshell, the maximum number of electrons having same value of spin quantum number is
• Which of the following configuration is/are correct in the first excited state ?
• consider the Bohr’s model of a one-electron atom whre the elctron moves around the nuceus. In the following List-I…
• If the value of (n + l ) is more than 3 and less than 6, then what will be the possible number of orbitals ?
• The electronic configuration of an element is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 , 4 s 1 . This represents its
• Assertion : - Particles are helium nuclei. Reason : They are deflected slightly towards the negative plate and hence…
• consider the Bohr’s model of a one-electron atom whre the elctron moves around the nuceus. In the following List-I…
• The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The…
• Photoelectric effect supports quantum nature of light because
• The hydrogen-like species Li 2+ is in a spherically symmetric state S 1 with one radial node. Upon absorbing light the…
• The minimum real charge on of any particle, which can exist is :
• Electromagnetic wave theory was proposed by James Clark Maxwell in 1864 . Acc. to this theory, the energy is emitted…
• Werner Heisenberg considered the limits of how precisely we can measure the properties of an electron or other…
• The sequence of filling electrons in sub-shells of elements with few exceptions in d-block and f-block elements is…
• The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from…
• Which of the following pairs of ions have the same electronic configuration ?
• The approximate quantum number of a circular orbit of diameter, 20.6 nm of the hydrogen atom according to Bohr’s theory…
• Werner Heisenberg considered the limits of how precisely we can measure the properties of an electron or other…
• The wavelength associated with a golf ball weighing 200 g and moving at speed of 5 m/h is of the order
• Assertion : In the emission spectrum of hydrogen atom, lines are closely spaced in the region of large wavelengths…
• For radial probability distribution curves, which of the following is/are correct ?
• Rutherford’s alpha particle scattering experiment eventually led to the conclusion that (1986)
• The orbital diagram in which the aufbau principle is violated (1988)
• Photoelectron emission is observed for three different metals A, B and C. The kinetic energy of the fastest…
• The hydrogen-like species Li 2+ is in a spherically symmetric state S 1 with one radial node. Upon absorbing light the…
• Assertion : When - rays hit a thin foil of gold, only a few - particles are deflected back. Reason : Within an atom…
• The total number of electrons in one molecule of carbon dioxide is
• The ground state energy of hydrogen atom is –13.6 eV. Consider an electronic state Ψ of He + whose energy, azimuthal…
• Which of the correct graphical representation based on photoelectric effect (assuming v > v 0 )
• Which of the following relates to photons both as wave motion and as a stream of particles?
• The increasing order (lowest first) for the values of e / m (charge/mass) for electron ( e ), proton ( p ), neutron ( n…
• Assertion : Half-filled and fully-filled degenerate orbitals are more stable. Reason : Extra stability is due to the…
• Which of the following parameters are not same for all hydrogen like atoms and ions in their ground state ?
• If each hydrogen atom in the ground state of 1.0 mole of H-atoms is excited by absorbing photons of energy 8.4eV, 12.09…
• A photon of 300 nm is absorbed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496 nm, the…
• One of the fundamental laws of physics is that matter is most stable with the lowest possible energy. Thus, the…
• The magnetic moment of X n+ is 24 BM . Hence, the species can be
• According to Bohr’s model, the highest kinetic energy is associated with the electron in the
• The given diagram indicates the energy levels of a certain atom. When the system moves from 2E level to E level, a…
• 4000 Å photon is used to break the iodine molecule,then the % of energy converted to the K.E. of iodine atoms if bond…
• A certain transition in H-spectrum from an excited state to ground state in one or more steps gives rise to a total of…
• The hydrogen-like species Li 2+ is in a spherically symmetric state S 1 with one radial node. Upon absorbing light the…
• The wavelength of a spectral line for an electronic transition is inversely related to (1988)
• The number of nodal planes in a p x orbital is (2005)
• Which of the following statement about quantum number is correct ?
• How many of the following ions have the same magnetic moments ? Fe 2+ Mn 2+ Cr 2+ Ni 2+
• If the total energy of an electron in the 1 st shell of H atom = 0.0 eV then its potential energy in the 1 st excited…
• Werner Heisenberg considered the limits of how precisely we can measure the properties of an electron or other…
• The electrons, identified by numbers n and l , (i) n = 4, l = 1, (ii) n = 4, l = 0, (iii) n = 3, l = 2, and (iv) n = 3…
• One of the fundamental laws of physics is that matter is most stable with the lowest possible energy. Thus, the…
• The graph between the stopping potential ( V 0 ) and (1/λ) is shown in the figure φ 1 , φ 2 and φ 3 are work functions…
• Electromagnetic wave theory was proposed by James Clark Maxwell in 1864 . Acc. to this theory, the energy is emitted…
• Which of the following electronic transition in a hydrogen atom will require the largest amount of energy
• The number of radial nodes of 3 s - and 2 p -orbitals are respectively
• When photons of energy 4.25 eV strike the surface of metal A , the ejected photoelectrons have maximum kinetic energy…
• Which of the following curves represent the speed of the electron of hydrogen atom as a function of principal quantum…
• The sequence of filling electrons in sub-shells of elements with few exceptions in d-block and f-block elements is…
• The ground state energy of hydrogen atom is –13.6eV. Consider an elctronic state of H3+ whose energy, azimuthal quantum…
• Rutherford’s experiment, which established the nuclear model of the atom, used a beam of
• Which of the following does not characterise X-rays ? (1992)
• The wavelength of a spectral line for an electronic transition is inversely related to
• A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2…
• If the shortest wavelength of transition of H-atom in Lyman series is x, then the correct conclusion is (are)
• Which of the following has the maximum number of unpaired electrons?
• When alpha particles are sent through a thin metal foil, most of them go straight through the foil because
• The sum of the number of neutrons and proton in the isotope of hydrogen is (1986)
• For hydrogen atom, the only CORRECT combination is (2018)
• The ratio of specific charge (e/m) of an electron to that of a hydrogen ion is :
• When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cut off voltage and…
• Which of the following statement (s) is (are) correct? (1998)
• What is the total number of pairs of electrons at least three same quantum numbers for Be ?
• In a sample of H-atoms, electrons make transitions from n = 5 to n = 1. If all the spectral lines are observed, then…
• The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by 1.25 × 10…
• When light of a given wavelength is incident on a metallic surface, the minimum potential needed to stop the emitted…
• The number of electrons in Na(11) having l = 0 are equal to
• Pick out the orbitals with the maximum number of nodal planes ?
• Assertion : The spin only magnetic moment of Zn 2+ is zero. Reason : Zn 2+ had 3d 10 4s 0 configuration. If has no…
• Electromagnetic wave theory was proposed by James Clark Maxwell in 1864 . Acc. to this theory, the energy is emitted…
• According to Bohr’s model, the highest kinetic energy is associated with the electron in the : (2024)
• The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [a 0 is Bohr radius] (2013)
• Consider a 20 W light source that emits monochromatic light of wavelength 600 nm. The number of photons ejected per…
• The wavelength associated with a golf ball weighing 200g and moving at a speed of 5 m/h is of the order (2001)
• The ratio of the de Broglie wavelength of a proton and -particles will be 1 : 2 if their :
• In following two plots, ^ 2 is plotted against the distance ‘r’ from nucleus. Select the correct statement :
• Which of the following has the maximum number of unpaired electrons ? (1996)
• In a mixture of H – He + gas (He + is singly ionized He atom), H atoms and He + ions are excited to their respective…
• For a hypothetical H like atom which follows Bohr’s model, some spectral lines were observed as shown. If it is known…
• The correct set of quantum numbers for the unpaired electron of chlorine atom is n l m n l m
• The correct ground state electronic configuration of chromium atom is
• In a mixture of H – He + gas (He + is singly ionized He atom), H atoms and He + ions are excited to their respective…
• The uncertainties in measurement of position and momentum of an electron are equal. Choose the correct statement.
• A proton accelerated from rest through a potential difference of ‘V’ volts has a wavelength associated with it. An…
• The orbital angular momentum of an electron in 2s orbital is (1992)
• The electronic configuration of an element is 1s 2 , 2s 2 2p 6 , 3s 2 3p 6 3d 5 , 4s 1 . This represents its (2000)
• If E 1 , E 2 and E 3 represent respectively the kinetic energies of an electron, an alpha particle and a proton each…
• Ground state electronic configuration of nitrogen atom can be represented by (1999)
• Assertion : Accurate measurement of both positions and momentum can be done simultaneously for a macroparticle. Reason…
• The quantum numbers + 1 2 and - 1 2 for the electron spin represent (2001)
• When alpha particles are sent through a thin metal foil, most of them go straight through the foil because (1984)
• The ratio of the energy of a photon of 200 Å wavelength radiation to that of 4000 Å radiation is (1986)
• The spin only magnetic moment of V (Z = 23), Cr (Z = 24) and Mn (Z = 25) are x, y and z respectively. Which of the…
• The number of radial nodes in 3s and 2p respectively are (2005)
• Which of the following relates to photons both as wave motion and as a stream of particles ? (1992)
• Electromagnetic radiation with maximum wavelength is (1985)
• Assertion (A) : The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in…
• If the nitrogen atom had electronic configuration 1s 7 , it would have energy lower than that of the normal ground…
• For photo-electric effect with incident photon wavelength l , the stopping potential is V 0 . Identify the correct…
• The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom [ a 0 is Bohr radius]
• The accelerating potential that must be imparted to proton beam to give an wavelength 5 pm.
• The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton (p), neutron (n) and…
• Assertion : According to the wave theory, the radiation emitted by the body being heated should have the same colour…
• A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the…
• In a photoelectric experiment anode potential is plotted against plate current
• If the nitrogen atom has electronic configuration 1 s 7 , it would have energy lower than that of the normal ground…
• Among the following, the correct statement(s) for electrons in an atom is(are) (2024)
• Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions φ p…
• Suppose 10 –17 J of light energy is needed by the interior of human eye to see an object. The photons of green light (λ…
• The work function of a metal is 4.2 eV. If radiations of 2000 Å fall on the metal. then the kinetic energy of the…
• Assertion : Cathode rays are produced only when the pressure of the gas inside the discharge tube is very low. Reason …
• 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…
• Assertion : Wave number of visible light with wave-length of 5000 Å is 2 × 10 6 m –1 . Reason : Wave number is defined…
• Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is (1984)
• In a historical experiment to determine Planck’s constant, a metal surface was irradiated with light of different…
• One of the fundamental laws of physics is that matter is most stable with the lowest possible energy. Thus, the…
• P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr…
• Rutherford’s experiment, which established the nuclear model of the atom, used a beam of (2002)
• If a certain metal was irradiated by using two different light radiations of frequency ‘x’ and ‘2x’, the maximum…
• Assertion : Emission spectrum of a pure atom is line spectrum, not the continuous. Reason : Energy of the atoms are…
• For the given orbital in Column 1, the only CORRECT combination of any hydrogen- like species is (2018)
• Let us consider following graph for radial distribution function. Which of the following has correct matching of curve…
• The number of neutrons in dipositive zinc ion with mass number 70 is
• Which hydrogen like species will have same radius as that of Bohr orbit of hydrogen atom ? (2004)
• As electron moves away from the nucleus, its potential energy
• In a mixture of H – He + gas (He + is singly ionized He atom), H atoms and He + ions are excited to their respective…
• Which electronic level would allow the hydrogen atom to absorb a photon but not be emit a photon ? (1984)
• What is the de–Broglie wavelength associated with the hydrogen electron in its third orbit
• The radius of which of the following orbit is same as that of the first Bohr’s orbit of hydrogen atom?
• The number of orbitals in n th Bohrs orbit of an atom equal to
• This question has Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best…
• The first use of quantum theory to explain the structure of atom was made by (1997)
• The mass number of three isotopes of an element are 11, 12, and 13 units. Their percentage abundances 80, 15, and 5…
• 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…
• De-Broglie wavelength for an electron is related to applied voltage as
• Pick out the isoelectronic structures from the following I. CH 3 + II. H 3 O + III. NH 3 IV. CH 3 –
• Which one of the following sets of quantum numbers represents an impossible arrangement ? (1986)
• The correct set of quantum numbers for the unpaired electron of chlorine atom is (1989)

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