JEE MAIN · CHEMISTRY · ATOMIC STRUCTURE
JEE Main Atomic Structure Questions & Solutions
122 solved questions on Atomic Structure, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
122 solved questions on Atomic Structure, ranging from easy to JEE-Advanced-flavour hard. Click any to see the full solution.
The work function of sodium metal is 4.41 $\times$ 10–19 J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be (h =…
View solution →The wavelength of an electron of kinetic energy $4.50\times10^{-29}$ J is _________ $\times 10^{-5}$ m. (Nearest integer) Given : mass of electron is $9\times10^{-31}$ kg, h…
View solution →The correct statement about probability density (except at infinite distance from nucleus) is :
View solution →Consider the following set of quantum numbers. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial,…
View solution →Maximum number of electrons that can be accommodated in shell with $n=4$ are:
View solution →Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of diameter $10^{-15} \mathrm{~m}$ is ________…
View solution →The de Broglie wavelength of an electron in the 4th Bohr orbit is :
View solution →Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :
View solution →The number of subshells associated with n = 4 and m = –2 quantum numbers is
View solution →Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is _________ $\times 10^{13} \mathrm{~Hz}$ (nearest integer). [Given :…
View solution →The energy of one mole of photons of radiation of frequency $2 \times 10^{12} \mathrm{~Hz}$ in $\mathrm{J} ~\mathrm{mol}^{-1}$ is ___________. (Nearest integer) [Given :…
View solution →An accelerated electron has a speed of 5 $\times$ 106 ms$-$1 with an uncertainty of 0.02%. The uncertainty in finding its location while in motion is x $\times$ 10$-$9 m. The…
View solution →A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 $\times$ 1014 Hz. The velocity of ejected electron is…
View solution →Which of the following sets of quantum numbers is not allowed?
View solution →The energy of an electron in the first Bohr orbit of hydrogen atom is $-2.18 \times 10^{-18} \mathrm{~J}$. Its energy in the third Bohr orbit is ____________.
View solution →If the radius of the first orbit of hydrogen atom is $\alpha_{0}$, then de Broglie's wavelength of electron in $3^{\text {rd }}$ orbit is :
View solution →Which one of the following sets of ions represents a collection of isoelectronic species? (Given : Atomic Number : $\mathrm{F:9,Cl:17,Na=11,Mg=12,Al=13,K=19,Ca=20,Sc=21}$)
View solution →The wave function $(\Psi)$ of $2 \mathrm{~s}$ is given by $$ \Psi_{2 \mathrm{~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…
View solution →Which transition in the hydrogen spectrum would have the same wavelength as the Balmer type transition from $\mathrm{n=4}$ to $\mathrm{n}=2$ of $\mathrm{He}^{+}$ spectrum
View solution →Values of work function (W$_0$) for a few metals are given below .tg {border-collapse:collapse;border-spacing:0;} .tg…
View solution →If the uncertainty in velocity and position of a minute particle in space are, 2.4 $\times$ 10$-$26 (m s$-$1) and 10$-$7 (m) respectively. The mass of the particle in g is…
View solution →Identify the incorrect statement from the following.
View solution →A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10 seconds. When this radiation falls on the surface of sodium, x $\times$ 1020 electrons are…
View solution →For the Balmer series in the spectrum of H atom, $\overline \nu = {R_H}\left\{ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right\}$, the correct statements among (I) to (IV) are :…
View solution →Electrons in a cathode ray tube have been emitted with a velocity of 1000 m s$^{-1}$. The number of following statements which is/are $\underline {\mathrm{true}}$ about the…
View solution →A ball weighing 10 g is moving with a velocity of 90 ms$-$1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ___________ $\times$ 10$-$33 m.…
View solution →The shortest wavelength of H atom in the Lyman series is $\lambda$1. The longest wavelength in the Balmar series of He+ is :
View solution →Given below are two statements.Statement I : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges…
View solution →The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is equal to ${{{h^2}} \over {xma_0^2}}$. The value of 10x is ___________. (a0 is radius of Bohr's…
View solution →When light of wavelength 248 nm falls on a metal of threshold energy 3.0 eV, the de-Broglie wavelength of emitted electrons is _______$\mathop A\limits^o$. (Round off to the…
View solution →Radius of the first excited state of Helium ion is given as : $\mathrm{a}_0 \rightarrow$ radius of first stationary state of hydrogen atom.
View solution →If the radius of the 3rd Bohr's orbit of hydrogen atom is r3 and the radius of 4th Bohr's orbit is r4. Then :
View solution →The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1 second is x $\times$ 1013. The value of x…
View solution →Given below are two statements : Statement (I): It is impossible to specify simultaneously with arbitrary precision, both the linear momentum and the position of a particle.…
View solution →The wavelength of electrons accelerated from rest through a potential difference of 40 kV is x $\times$ 10$-$12 m. The value of x is ___________. (Nearest integer)Give : Mass of…
View solution →The radius of the second Bohr orbit, in terms of the Bohr radius, a0, in Li2+ is :
View solution →The number of radial node/s for $3 p$ orbital is :
View solution →Given below are the quantum numbers for 4 electrons. A. $\mathrm{n}=3,l=2, \mathrm{~m}_{1}=1, \mathrm{~m}_{\mathrm{s}}=+1 / 2$ B. $\mathrm{n}=4,l=1, \mathrm{~m}_{1}=0,…
View solution →Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of metal A in kJ mol$-$1 is __________. (Rounded off to the…
View solution →The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are
View solution →According to Bohr's model of hydrogen atom, which of the following statement is incorrect?
View solution →The energy of one mole of photons of radiation of wavelength 300 nm is (Given : h = 6.63 $\times$ 10$-$34 J s, NA = 6.02 $\times$ 1023 mol$-$1, c = 3 $\times$ 108 m s$-$1)
View solution →For hydrogen atom, energy of an electron in first excited state is $-3.4 \mathrm{~eV}, \mathrm{K} . \mathrm{E}$. of the same electron of hydrogen atom is $x \mathrm{~eV}$. Value…
View solution →A proton and a Li3+ nucleus are accelerated by the same potential. If $\lambda _{Li}$ and $\lambda _p$ denote the de Broglie wavelengths of Li3+ and proton respectively, then the…
View solution →The shortest wavelength of hydrogen atom in Lyman series is $\lambda$. The longest wavelength is Balmer series of He$^+$ is
View solution →The de-Broglie's wavelength of an electron in the $4^{\text {th }}$ orbit is ________ $\pi \mathrm{a}_0$. ($\mathrm{a}_0=$ Bohr's radius)
View solution →Which of the following forms of hydrogen emits low energy $\beta$- particles?
View solution →Outermost electronic configurations of four elements A, B, C, D are given below : (A) $3 s^{2}$ (B) $3 s^{2} 3 p^{1}$ (C) $3 s^{2} 3 p^{3}$ (D) $3 s^{2} 3 p^{4}$ The correct order…
View solution →If the work function of a metal is 6.63 $\times$ 10$-$19J, the maximum wavelength of the photon required to remove a photoelectron from the metal is ____________ nm. (Nearest…
View solution →Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Energy of $2 \mathrm{s}$ orbital of hydrogen atom is greater…
View solution →Given below are two statements: One is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$ Assertion $\mathbf{A}$ : Zero orbital overlap is an out…
View solution →A certain orbital has no angular nodes and two radial nodes. The orbital is :
View solution →The pair, in which ions are isoelectronic with AI3+ is :
View solution →The difference between the radii of 3rd and 4th orbits of Li2+ is R1 . The difference between the radii of 3rd and 4th orbits of He+ is $\Delta$R2 . Ratio $\Delta$R1 : $\Delta$R2…
View solution →Number of spectral lines obtained in $\mathrm{He}^{+}$ spectra, when an electron makes transition from fifth excited state to first excited state will be
View solution →Consider the following pairs of electrons (A) (a) n = 3, $l$ = 1, m1 = 1, ms = + ${1 \over 2}$ (b) n = 3, 1 = 2, m1 = 1, ms = + ${1 \over 2}$ (B) (a) n = 3, $l$ = 2, m1 = $-$2, ms…
View solution →Consider the following statements : (A) The principal quantum number 'n' is a positive integer with values of 'n' = 1, 2, 3, ... (B) The azimuthal quantum number 'l' for a given…
View solution →The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is
View solution →The number of orbitals associated with quantum number n = 5, ms = +${1 \over 2}$ is :
View solution →When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are _____________.
View solution →Consider the ground state of chromium atom $(Z=24)$. How many electrons are with Azimuthal quantum number $l=1$ and $l=2$ respectively ?
View solution →Compare the energies of following sets of quantum numbers for multielectron system. (A) $\mathrm{n}=4,1=1$ (B) $\mathrm{n}=4,1=2$ (C) $\mathrm{n}=3, \mathrm{l}=1$ (D)…
View solution →Consider the hypothetical situation where the azimuthal quantum number, $l$, takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with…
View solution →The maximum number of orbitals which can be identified with $\mathrm{n}=4$ and $m_l=0$ is _________.
View solution →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…
View solution →The number of radial and angular nodes in 4d orbital are, respectively
View solution →If the wavelength for an electron emitted from $\mathrm{H}$-atom is $3.3 \times 10^{-10} \mathrm{~m}$, then energy absorbed by the electron in its ground state compared to minimum…
View solution →Which of the following statements are correct? (A) The electronic configuration of Cr is [Ar] 3d5 4s1. (B) The magnetic quantum number may have a negative value. (C) In the ground…
View solution →Outermost electronic configuration of a group 13 element, E, is 4s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :
View solution →Consider an imaginary ion ${ }_{22}^{48} \mathrm{X}^{3-}$. The nucleus contains '$a$'% more neutrons than the number of electrons in the ion. The value of 'a' is _______________.…
View solution →The longest wavelength of light that can be used for the ionisation of lithium atom (Li) in its ground state is x $\times$ 10$-$8 m. The value of x is ___________. (Nearest…
View solution →The number of atomic orbitals from the following having 5 radial nodes is ___________. $7 \mathrm{s}, 7 \mathrm{p}, 6 \mathrm{s}, 8 \mathrm{p}, 8 \mathrm{d}$
View solution →A certain orbital has n = 4 and mL = $-$3. The number of radial nodes in this orbital is ____________. (Round off to the Nearest Integer).
View solution →If the Thompson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been :
View solution →According to Bohr's atomic theory :(A) Kinetic energy of electron is $\propto {{{Z^2}} \over {{n^2}}}$.(B) The product of velocity (v) of electron and principal quantum number…
View solution →The orbital angular momentum of an electron in $3 \mathrm{~s}$ orbital is $\frac{x h}{2 \pi}$. The value of $x$ is ____________ (nearest integer)
View solution →The correct set of four quantum numbers for the valence electron of rubidium atom $(\mathrm{Z}=37)$ is :
View solution →Wavenumber for a radiation having 5800 $\mathop A\limits^o$ wavelength is $x \times 10 \mathrm{~cm}^{-1}$ The value of $x$ is ________. (Integer answer)
View solution →The number of radial nodes and total number of nodes in 4p orbital respectively are :
View solution →The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is : [Given : The threshold frequency of platinum is 1.3…
View solution →A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x $\times$ 1020. The value of x is __________. [Given…
View solution →The ionization energy of sodium in $\mathrm{~kJ} \mathrm{~mol}^{-1}$, if electromagnetic radiation of wavelength $242 \mathrm{~nm}$ is just sufficient to ionize sodium atom is…
View solution →Assume that the radius of the first Bohr orbit of hydrogen atom is 0.6 $\mathrm{\mathop A\limits^o }$. The radius of the third Bohr orbit of He$^+$ is __________ picometer.…
View solution →The value of Rydberg constant $(R_H)$ is $2.18 \times 10^{-18} \mathrm{~J}$. The velocity of electron having mass $9.1 \times 10^{-31} \mathrm{~kg}$ in Bohr's first orbit of…
View solution →The wavelength of an electron and a neutron will become equal when the velocity of the electron is $x$ times the velocity of neutron. The value of $x$ is ____________. (Nearest…
View solution →In an atom, total number of electrons having quantum numbers $\mathrm{n}=4,\left|\mathrm{~m}_l\right|=1$ and $\mathrm{m}_{\mathrm{s}}=-\frac{1}{2}$ is _________.
View solution →The number of given orbitals which have electron density along the axis is _________ $\mathrm{p_x,p_y,p_z,d_{xy},d_{yz},d_{xz},d_{z^2},d_{x^2-y^2}}$
View solution →The minimum uncertainty in the speed of an electron in an one dimensional region of length $2 \mathrm{a}_{\mathrm{o}}$ (Where $\mathrm{a}_{\mathrm{o}}=$ Bohr radius $52.9…
View solution →The radius of the $\mathrm{2^{nd}}$ orbit of $\mathrm{Li^{2+}}$ is $x$. The expected radius of the $\mathrm{3^{rd}}$ orbit of $\mathrm{Be^{3+}}$ is
View solution →The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency '$A$' $\times 10^{12}$ hertz and that has a radiant…
View solution →The number of orbitals with n = 5, m1 = +2 is ___________. (Round off to the Nearest Integer).
View solution →The region in the electromagnetic spectrum where the Balmar series lines appear is :
View solution →The orbital having two radial as well as two angular nodes is :
View solution →Given below are two statements :Statement I : Bohr's theory accounts for the stability and line spectrum of Li+ ion.Statement II : Bohr's theory was unable to explain the…
View solution →Given below are two statements :Statement I : Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom.Statement II : Bohr's model of hydrogen atom…
View solution →The correct decreasing order of energy for the orbitals having, following set of quantum numbers : (A) n = 3, l = 0, m = 0 (B) n = 4, l = 0, m = 0 (C) n = 3, l = 1, m = 0 (D) n =…
View solution →The number of s-electrons present in an ion with 55 protons in its unipositive state is
View solution →Arrange the following orbitals in decreasing order of energy. A. $\mathrm{n}=3, \mathrm{l}=0, \mathrm{~m}=0$ B. $\mathrm{n}=4, \mathrm{l}=0, \mathrm{~m}=0$ C. $\mathrm{n}=3,…
View solution →Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : In the photoelectric effect, the electrons are ejected from…
View solution →Given below are two statements: Statement I : According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised. Statement…
View solution →Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial,…
View solution →Given below are two statements : Statement (I) : The orbitals having same energy are called as degenerate orbitals. Statement (II) : In hydrogen atom, 3p and 3d orbitals are not…
View solution →In case of isoelectronic species the size of $\mathrm{F}^{-}, \mathrm{Ne}$ and $\mathrm{Na}^{+}$is affected by :
View solution →Choose the Incorrect Statement about Dalton's Atomic Theory
View solution →The incorrect postulates of the Dalton's atomic theory are : (A) Atoms of different elements differ in mass. (B) Matter consists of divisible atoms. (C) Compounds are formed when…
View solution →Given below are two statements : Statement (I) : A spectral line will be observed for a $2 p_x \rightarrow 2 p_y$ transition. Statement (II) : $2 \mathrm{p}_x$ and $2…
View solution →Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this? Given : Rydberg constant…
View solution →Given below are two statements : Statement (I) : For a given shell, the total number of allowed orbitals is given by $n^2$. Statement (II) : For any subshell, the spatial…
View solution →For hydrogen atom, the orbital/s with lowest energy is/are : (A) $\mathrm{4 s}$ (B) $3 \mathrm{p}_x$ (C) $3 \mathrm{~d}_{x^2-y^2}$ (D) $3 \mathrm{~d}_{z^2}$ (E) $4 \mathrm{p}_z$…
View solution →In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? A. $\mathrm{n}=1,…
View solution →Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom?(A) 1s < 2p < 3d < 4s(B) 1s < 2s = 2p < 3s = 3p(C) 1s < 2s < 2p < 3s < 3p(D)…
View solution →If $a$0 is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength (λ) of the electron present in the second orbit of hydrogen atom? [n : any integer]
View solution →Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
View solution →For electrons in ' 2 s ' and ' 2 p ' orbitals, the orbital angular momentum values, respectively are:
View solution →The extra stability of half-filled subshell is due to : (A) Symmetrical distribution of electrons (B) Smaller coulombic repulsion energy (C) The presence of electrons with the…
View solution →Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _________. (Integer answer)(A) Li(B) Na(C) Rb(D) Cs
View solution →The Azimuthal quantum number for the valence electrons of Ga+ ion is ___________.(Atomic number of Ga = 31)
View solution →If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of the second line of this series is _________ nm. (Nearest integer)
View solution →The number of following statement/s which is/are incorrect is ___________ (A) Line emission spectra are used to study the electronic structure (B) The emission spectra of atoms in…
View solution →The number of incorrect statement/s about the black body from the following is __________ (A) Emit or absorb energy in the form of electromagnetic radiation. (B) Frequency…
View solution →The total number of isoelectronic species from the given set is ___________. $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Al}, \mathrm{Mg}^{2+}, \mathrm{Na}^{+}, \mathrm{O}^{+},…
View solution →The energy of an electron in the first Bohr orbit of the H-atom is -13.6 eV. The magnitude of energy value of an electron in the first excited state of Be3+ is ________ eV…
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