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Atomic Structure

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Q JEE MAIN 2026
Which of the following point in Figure 2 most accurately represents the nodal surface as shown in Figure 1
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Q JEE MAIN 2026
The wave numbers of three spectral lines of H atom are considered. Identify the set of spectral lines belonging to...
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Q JEE MAIN_2026_
Two positively charged particles and have been accelerated across the same potential difference of 200 keV as shown below.
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Q JEE MAIN 2026
The wavelength of spectral line obtained in the spectrum of $\mathrm{Li}^{2+}$ ion, when the transition takes place between two levels...
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Q JEE MAIN_2026
The wavelength of photon ' $A$ ' is 400 nm . The frequency of photon ' $B$ ' is $...
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Q JEE MAIN 2026
The hydrogen spectrum consists of several spectral lines in Lyman series $\left(\mathrm{L}_1, \mathrm{~L}_2, \mathrm{~L}_3 \ldots ; \mathrm{L}_1\right.$ has lowest energy...
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Q JEE MAIN 2026
The work functions of two metals $\left(M_A\right.$ and $\left.M_B\right)$ are in the $1: 2$ ratio. When these metals are exposed...
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Q JEE MAIN 2026
Identify the INCORRECT statements from the following: A. Notation ${ }_{12}^{24} \mathrm{Mg}$ represents 24 protons and 12 neutrons. B. Wavelength...
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Q JEE MAIN 2026
Given, (A) $\mathrm{n}=5, \mathrm{~m}_{\ell}=-1$ (B) $\mathrm{n}=3,1=2, \mathrm{~m}_{\ell}=-1, \mathrm{~m}_{\mathrm{s}}=+\frac{1}{2}$ The maximum number of electron(s) in an atom that can have the...
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Q JEE MAIN 2026
Which of the following statements regarding the energy of the stationary state is true in the following one - electron...
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Q JEE MAIN 2026
The energy of first (lowest) Balmer line of H atom is $x \mathrm{~J}$. The energy (in J ) of second...
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Q JEE MAIN 2026
consider the following spectral lines for atomic hydrogen : A. First line of Paschen series B. Second line of Balmer...
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Q JEE MAIN 2026
The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr...
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Q JEE MAIN_2026_
Given below are two statements : Statement I: When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules...
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Q JEE MAIN 2020
The metal mainly used in devising photoelectric cells is
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Q JEE MAIN 2019
The electrons are more likely to be found
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Q JEE MAIN 2020
The figure that is not a direct manifestation of the quantum nature of atoms is
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Q JEE MAIN 2020
The work function of sodium metal is $4.41 \times 10^{-19} \mathrm{~J}$. If photons of wavelength 300 nm are incident on...
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Q JEE MAIN 2020
The number of subshells associated with n = 4 and m = –2 quantum numbers is
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Q JEE MAIN 2019
Among the following, the energy of 2s orbital is lowest in:
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Q JEE MAIN 2019
Which of the following combination of statements is true regarding the interpretation of the atomic orbitals? (a) An electron in...
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Q JEE MAIN_2019_
Increasing rate of $\mathrm{S}_{\mathrm{N}} 1$ reaction in the following compounds is:
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Q JEE MAIN_2019_
The isoelectronic set of ions is :
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Q JEE MAIN_2019_
The graph between $|\psi|^2$ and r(radial distance) is shown below. This represents i.
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Q JEE MAIN 2019
For any given series of spectral lines of atomic hydrogen, let $\Delta \bar{v}=\bar{v}_{\max }-\bar{v}_{\min }$ be the difference in maximum...
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Q JEE MAIN 2020
The difference between radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $\mathrm{Li}^{2+}$ is $\Delta \mathrm{R}_1$. The difference...
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Q JEE MAIN 2019
If the de Broglie wavelength of the electron in $\mathrm{n}^{\text {th }}$ Bohr orbit in a hydrogenic atom is equal...
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Q JEE MAIN 2020
In the sixth period, the orbitals that are filled are
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Q JEE MAIN 2019
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of Hatom is...
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Q JEE MAIN 2020
The de Broglie wavelength of an electron in the $4^{\text {th }}$ Bohr orbit
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Q JEE MAIN 2019
The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The...
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Q JEE MAIN 2020
For the Balmer series in the spectrum of H atom, $\bar{v}=\mathrm{R}_{\mathrm{H}}\left\{\frac{1}{\mathrm{n}_1^2}-\frac{1}{\mathrm{n}_2^2}\right\}$, the correct statements among (I) to (VI) are (I)...
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Q JEE Main 2019
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal...
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Q JEE Main 2019
The major product of the following reaction is
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Q JEE MAIN 2020
The region in the electromagnetic spectrum where the Balmar series lines appear is
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Q JEE Main 2019
The major product of the following reaction is
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Q JEE MAIN 2020
The shortest wavelength of H atom in the Lyman series is $\lambda_1$. The longest wavelength in the Balmar series of...
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Q JEE MAIN 2019
The de Broglie wavelength ( $\lambda$ ) associated with a photoelectron varies with the frequency ( $v$ ) of the...
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Q JEE MAIN 2019
Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect? (The Bohr...
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Q JEE-MAIN 2020
Consider the hypothetical situation where the azimuthal quantum number,l, takes value 0, 1, 2, ... n + 1, where n...
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Q JEE MAIN 2020
The radius of the second Bohr orbit, in terms of the Bohr radius, $\mathbf{a}_0$, in $\mathrm{Li}^{2+}$ is
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Q JEE MAIN 2021
The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of...
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Q JEE MAIN 2020
The number of orbitals associated with quantum numbers $\mathrm{n}=5, \mathrm{~m}_{\mathrm{s}}=+\frac{1}{2}$ is:
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Q JEE-MAIN 2021
A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is $...
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Q JEE MAIN 2021
Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to ______
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Q JEE MAIN 2021
Given below are two statements. Statement I: According to Bohr's model of an atom, qualitatively the magnitude of velocity of...
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Q JEE MAIN 2019
The 71st electron of an element X with an atomic number of 71 enters into the orbital:
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Q JEE MAIN 2019
The ground state energy of hydrogen atom is -13.6 eV . The energy of second excited state of $\mathrm{He}^{+}$ion in...
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Q JEE MAIN 2021
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is equal to $...
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Q JEE MAIN_2021_
What is A in the following reaction?
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Q JEE MAIN 2021
A 50 watt bulb emits monochromatic red light of wavelength of 795 nm . The number of photons emitted per...
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Q JEE MAIN_2021
If the Thompson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been
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Q JEE-MAIN 2021
A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second...
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Q JEE MAIN 2021
$\mathrm{Ge}(\mathrm{Z}=32)$ in its ground state electronic configuration has x completely filled orbitals with $\mathrm{m}_{\mathrm{I}}=0$. The value of $x$ is $\_\_\_\_$...
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Q JEE MAIN 2019
The size of the iso-electronic species $\mathrm{Cl}^{-}, \mathrm{Ar}$ and $\mathrm{Ca}^{2+}$ is affected by
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Q JEE MAIN 2021
An accelerated electron has a speed of $5 \times 10^6 \mathrm{~ms}^{-1}$ with an uncertainty of $0.02 \%$. The uncertainty in...
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Q JEE MAIN 2021
The Azimuthal quantum number for the valence electrons of Ga+ ion is _______. (Atomic number of Ga = 31)
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Q JEE MAIN 2019
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Q JEE MAIN 2021
The wavelength of electrons accelerated from rest through a potential difference of 40 kV is $x \times 10^{-12} \mathrm{~m}$. The...
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Q JEE MAIN 2021
Given below are two statements : Statement I : Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen...
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Q JEE MAIN 2019
If $p$ is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having...
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Q JEE-MAIN 2021
In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is ______ × $10^{-1}$ BM. (Round off...
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Q JEE MAIN 2021
Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A . The ionization energy...
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Q JEE MAIN 2021
Given below are two statements : Statement I : Bohr's theory accounts for the stability and line spectrum of Li+...
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Q JEE MAIN 2021
Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _______ (Integer answer)
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Q JEE Main 2019
For emission line of atomic hydrogen from $n_i=8 \mid$ to $n_f=n$, the plot of wave number $(\vec{v})$ against $\left(\frac{1}{n^2}\right)$ will...
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Q JEE-Main-2021_
A certain orbital has $\mathrm{n}=4$ and $\mathrm{m}_{\varepsilon}=-3$. The number of radial nodes in this orbital is $\_\_\_\_$ . (Round off...
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Q JEE-Main-2021_
What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it's aqueous...
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Q JEE MAIN 2021
The number of orbitals with $\mathrm{n}=5, \mathrm{~m}_1=+2$ is $\_\_\_\_$ . (Round off to the Nearest Integer).
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Q _JEE-Main-2021_
The above reaction requires which of the following reaction conditions?
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Q JEE MAIN 2021
A certain orbital has no angular nodes and two radial nodes. The orbital is :
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Q JEE MAIN 2021
According to Bohr's atomic theory :- (1) Kinetic energy of electron is $\propto \frac{\mathrm{Z}^2}{\mathrm{n}^2}$. (2) The product of velocity (v)...
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Q JEE MAIN 2021
When light of wavelength 248 nm falls on a metal of threshold energy 3.0 eV, the de-Broglie wavelength of emitted...
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Q JEE MAIN 2021
A proton and a $\mathrm{Li}^{3+}$ nucleus are accelerated by the same potential. If $\lambda_{\mathrm{Li}}$ and $\lambda_P$ denote the de Broglie...
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Q JEE MAIN 2021
Which of the following forms of hydrogen emits low energy $\beta^{-}$particles?
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Q JEE MAIN 2021
The orbital having two radial as well as two angular nodes is -
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Q JEE MAIN 2021
What is the major product formed by HI on reaction with
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Q JEE MAIN 2021
The product formed in the first step of the reaction of with excess $\mathrm{Mg} / \mathrm{Et}_2 \mathrm{O}\left(\mathrm{Et}=\mathrm{C}_2 \mathrm{H}_5\right)$ is :
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Q JEE MAIN 2021
In which of the following pairs, the outer most electronic configuration will be the same?
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Q JEE MAIN 2021
The plots of radial distribution functions for various orbitals of hydrogen atom against 'r' are given below:
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Q JEE MAIN 2022
Consider an imaginary ion ${ }_{22}^{48} \mathrm{X}^{3-}$. The nucleus contains ' a ' $\%$ more neutrons than the number of...
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Q JEE MAIN 2002
When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number...
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Q JEE MAIN 2022
Given below are two statements. One is labeled as Assertion A and the other is labeled as Reason R. Assertion...
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Q JEE MAIN 2022
The minimum uncertainty in the speed of an electron in an one dimensional region of length $2 a_0$ (Where $\mathbf{a}_0=$...
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Q JEE MAIN 2022
If the wavelength for an electron emitted from H -atom is $3.3 \times 10^{-10} \mathrm{~m}$, then energy absorbed by the...
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Q JEE MAIN 2022
The wavelength of an electron and a neutron will become equal when the velocity of the electron is x times...
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Q JEE MAIN 2022
The correct decreasing order of energy, for the orbitals having, following set of quantum numbers: (A) $\mathrm{n}=3, \ell=0, \mathrm{~m}=0$ (B)...
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Q JEE MAIN 2022
Identify the incorrect statement from the following.
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Q JEE MAIN 2022
Given two statements below : Statement I : In Cl2 molecule the covalent radius is double of the atomic radius...
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Q JEE-Main 2022
Which of the following sets of quantum numbers is not allowed ?
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Q JEE MAIN 2022
Consider the following statements : (A) The principal quantum number ‘n’ is a positive integer with values of ‘n’ =...
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Q JEE MAIN 2022
Which of the following is the correct plot for the probability density $\psi^2(r)$ as a function of distance ' $r$...
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Q JEE MAIN
The number of radial and angular nodes in 4d orbital are. Respectively
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Q JEE MAIN 2022
The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is:...
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Q JEE-Main 2022
The energy of one mole of photons of radiation of wavelength 300 nm is (Given : $...
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Q JEE MAIN 2022
If the work function of a metal is $6.63 \times 10^{-19} \mathrm{~J}$, the maximum wavelength of the photon required to...
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Q JEE MAIN 2022
Which of the following statements are correct ? (A) The electronic configuration of Cr is $[\mathrm{Ar}] 3 \mathrm{~d}^5 4 \mathrm{~s}^1$....
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Q JEE MAIN 2022
The longest wavelength of light that can be used for the ionisation of lithium atom (Li) in its ground state...
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Q JEE MAIN 2024
The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are
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Q JEE MAIN 2024
The number of radial node/s for 3p orbital is:
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Q JEE MAIN 2022
It the radius of the 3rd Bohr’s orbit of hydrogen atom is r3 and the radius of 4th Bohr’s orbit...
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Q JEE MAIN 2022
The pair, in which ions are isoelectronic with $\mathrm{Al}^{3+}$ is :-
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Q JEE-Main 2022
Consider the following pairs of electrons (A) (a) $\mathrm{n}=3, \ell=1, \mathrm{~m}_1=1, \mathrm{~m}_{\mathrm{s}}=+\frac{1}{2}$ (b) $\mathrm{n}=3, \ell=2, \mathrm{~m}_1=1, \mathrm{~m}_{\mathrm{s}}=+\frac{1}{2}$ (B) (a) $...
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Q JEE MAIN 2024
Number of spectral lines obtained in $\mathrm{He}^{+}$spectra, when an electron makes transition from fifth excited state to first excited state...
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Q JEE MAIN 2024
Match List I with List II Choose the correct answer from the options given below :-
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Q JEE MAIN 2025
The energy of an electron in first Bohr orbit of H -atom is -13.6 eV. The magnitude of energy value...
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Q JEE MAIN 2025
Consider the ground state of chromium atom $(Z=24)$ . How many electrons are with Azimuthal quantum number $l=1$ and $l=2$...
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The extra stability of half-filled subshell is due to : (A) Symmetrical distribution of electrons (B) Smaller coulombic repulsion energy...
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Q JEE MAIN 2023
The orbital angular momentum of an electron in 3 s orbital is $\frac{x h}{2 \pi}$. The value of $x$ is:
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Q JEE MAIN 2023
The number of correct statements from the following _____ A. For 1s orbital, the probability density is maximum at the...
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Q JEE MAIN 2023
The number of atomic orbitals from the following having 5 radial nodes is ______.7s, 7p, 6s, 8p, 8d
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Q JEE MAIN 2025
For electrons in '2s' and '2p' orbitals, the orbital angular momentum values, respectively are :
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Q JEE MAIN 2023
The electron in the $\mathrm{n}^{\text {th }}$ orbit of $\mathrm{Li}^{2+}$ is excited to ( $\mathrm{n}+1$ ) orbit using the radiation...
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Q JEE MAIN 2023
For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has ______ number of unpaired electrons.
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Value of work function $\left(\mathrm{W}_0\right)$ for a few metals are given below: The number of metals which will show photoelectric...
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Q JEE MAIN 2023
If the radius of the first orbit of hydrogen atom $\mathbf{a}_0$, then de-Broglie's wavelength of electron in $3^{\text {rd }}$...
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Q JEE MAIN 2023
Assume that the radius of the first Bohr orbit of hydrogen atom is $0.6 \AA$. The radius of the third...
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Q JEE MAIN 2023
Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following...
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Q JEE MAIN 2023
The number of given orbitals which have electron density along the axis is _______ px, py, pz, dxy, dyz dxz,
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Q JEE-Main_2023
Arrange the following orbitals in decreasing order of energy ? (A) n = 3, l = 0, m = 0...
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Q JEE MAIN 2023
Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the...
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Q JEE MAIN 2023
The wave function $(\Psi)$ of 2 s is given by $$ \Psi_{2 s}=\frac{1}{2 \sqrt{2 \pi}}\left(\frac{1}{a_0}\right)^{1 / 2}\left(2-\frac{r}{a_0}\right) e^{-r / 2...
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Q JEE MAIN 2023
Maximum number of electrons that can be accommodated in shell with n = 4 are:
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Q JEE MAIN 2023
The total number of isoelectronic species from the given set is ____. $...
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Q JEE MAIN 2023
The energy of an electron in the first Bohr orbit of hydrogen atom is –2.18×10–18 J. Its energy in the...
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Q JEE MAIN 2023
The number of incorrect statement/s about the black body from the following is _______ (A) Emit or absorb energy in...
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Given below are two statements Statement-I: According to Bohr's model of hydrogen atom, the angular momentum of an electron in...
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Q JEE MAIN 2023
The number of following statement/s which is/are incorrect is______.
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion...
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The wavelength of an electron of kinetic energy $4.50 \times 10^{-29} \mathrm{~J}$ is $\_\_\_\_$ $\times 10^{-5} \mathrm{~m}$. (Nearest integer) Given:...
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If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of...
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The energy of one mole of photons of radiation of frequency $2 \times 10^{12} \mathrm{~Hz} \mathrm{in} \mathrm{J} \mathrm{mol}^{-1}$ is $\_\_\_\_$...
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Electrons in a cathode ray tube have been emitted with a velocity of $1000 \mathrm{~ms}^{-1}$. The number of following statements...
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It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power ' $n$ ' i.e....
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The total number of lone pairs of electrons on oxygen atoms of ozone is_____
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Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from n = 4...
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Q JEE MAIN 2023
Identify the correct order for the given property for following compounds
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If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of...
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Q JEE MAIN 2023
The shortest wavelength of hydrogen atom in Lyman series is . The longest wavelength in Balmer series of He+ is
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The radius of the $2^{\text {nd }}$ orbit of $\mathrm{Li}^{2+}$ is x . The expected radius of the $...
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It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power 'n' i.e. $v^n$ of...
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Q JEE MAIN 2024
Compare the energies of following sets of quantum numbers for multielectron system. (A) n=4,1=1 (B) n=4,1=2 (C) n=3,1=1 (D) n=3,1=2...
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The de-Broglie's wavelength of an electron in the $4^{\text {th }}$ orbit is $\_\_\_\_$ $\pi \mathrm{a}_0 \cdot\left(\mathrm{a}_0=\right.$ Bohr's radius $)$
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Frequency of the de-Broglie wave of election in Bohr's first orbit of hydrogen atom is $\times 10^{13} \mathrm{~Hz}$ (nearest integer)....
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A hypothetical electromagnetic wave is show below. The frequency of the wave is $x \times 10^{19}$ Hz. x= ___________ (nearest...
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The value of Rydberg constant (R_H ) is 2.18×〖10〗^(-18) " " J. The velocity of electron having mass 9.1×〖10〗^(-31) "...
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Q JEE MAIN 2024
The incorrect postulates of the Dalton's atomic theory are : (A) Atoms of different elements differ in mass. (B) Matter...
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The ionization energy of sodium in $\mathrm{kJmol}^{-1}$. If electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium...
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Q JEE MAIN 2024
The correct set of four quantum numbers for the valence electron of rubidium atom (Z=37) is:
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Given below are two statements: Statement-I : The orbitals having same energy are called as degenerate orbitals. Statement-II : In...
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Which of the following statements are true? (A) The subsidiary quantum number $l$ describes the shape of the orbital occupied...
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Q JEE MAIN 2024
The number of electrons present in all the completely filled subshells having $\mathrm{n}=4$ and $\mathrm{s}=+\frac{1}{2}$ is (Where $\mathrm{n}=$ principal quantum...
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Q JEE MAIN 2025
For hydrogen like species, which of the following graphs provides the most appropriate representation of E vs Z plot for...
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Given below are two statements :[0pt] Statement (I): It is impossible to specify simultaneously with arbitrary precision, both the linear...
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Which of the following statements are correct, if the threshold frequency of caesium is $5.16 \times {10^{14}}\;{\rm{Hz}}$ ? A. When...
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Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect? (Bohr's...
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Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom?[0pt] (A) $1 \mathrm{~s}
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Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of...
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Q JEE MAIN 2025
For hydrogen atom, the orbital/s with lowest energy is/are :[0pt] (A) 4 s (B) $3 p_{x}$ (C) $3 d_{x^{2}-y^{2}}$ (D)...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
According to Bohr's model of hydrogen atom, which of the following statement is incorrect?
JEE Main Chemistry Easy
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Q JEE MAIN 2025
Given below are two statements : Statement (I): For a given shell, the total number of allowed orbitals is given...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
If ${a_0}$ is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength $(\lambda )$ of...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
Given below are two statements : Statement (I): A spectral line will be observed for a $...
JEE Main Chemistry Easy
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Q JEE MAIN 2025
Lanthanoid ions with $4{f^7}$ configuration are : (A) $\mathrm{Eu}^{2+}$ (B) $\mathrm{Gd}^{3+}$ (C) $\mathrm{Eu}^{3+}$ (D) $\mathrm{Tb}^{3+}$ (E) $\mathrm{Sm}^{2+}$ Choose the correct...
JEE Main Chemistry Hard
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Q JEE MAIN 2025
Radius of the first excited state of Helium ion is given as: ${{\rm{a}}_0} \to$ radius of first stationary state of...
JEE Main Chemistry Medium
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No JEE Advanced questions found for Atomic Structure