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Structure of Atom

208 Questions
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET
2020 JEE Mains MCQ
JEE Main 2020 (Online) 7th January Morning Slot
The number of orbitals associated with quantum number n = 5, ms = +${1 \over 2}$ is :
A.
11
B.
25
C.
15
D.
50
2020 JEE Mains Numerical
JEE Main 2020 (Online) 2nd September Evening Slot
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 = 6.63 $ \times $ 10–34 J s; c = 3 $ \times $ 108 m/s) ________ × 10–21 J.
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th April Morning Slot
The electrons are more likely to be found : JEE Main 2019 (Online) 12th April Morning Slot Chemistry - Structure of Atom Question 154 English
A.
only in the region a
B.
in the region a arid c
C.
only in the region c
D.
in the region a and b
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th April Morning Slot
The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
A.
16, 6 and 3
B.
15, 6 and 12
C.
16, 5 and 2
D.
15, 5 and 3
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th April Evening Slot
The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :
A.
Paschen and Pfund
B.
Balmer and Brackett
C.
Lyman and Paschen
D.
Brackett and Pfund
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th April Morning Slot
The graph between ${\left| \psi \right|^2}$ and r (radial distance) is shown below. This represents : JEE Main 2019 (Online) 10th April Morning Slot Chemistry - Structure of Atom Question 156 English
A.
3s orbital
B.
2s orbital
C.
2p orbital
D.
1s orbital
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th April Morning Slot
The isoelectronic set of ions is :
A.
F–, Li+, Na+ and Mg2+
B.
Li+, Na+, O2- and F-
C.
N3–, O2-, F- and Na+
D.
N3–, Li+, Mg2+ and O2-
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th April Evening Slot
Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect ?

(The Bohr radius is represented by a0)
A.
The probability density of finding the electron is maximum at the nucleus.
B.
The electron can be found at a distance 2a0 from the nucleus
C.
The total energy of the electron is maximum when it is at a distance a0 from the nucleus.
D.
The magnitude of potential energy is double that of its kinetic energy on an average.
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th April Morning Slot
For any given series of spectral lines of atomic hydrogen, let $\Delta \mathop v\limits^\_ = $ $\Delta {\overline v _{\max }} - \Delta {\overline v _{\min }}$ be the difference in maximum and minimum frequencies in cm–1. The ratio Lyman Balmer ${{\Delta {{\overline v }_{Lyman}}} \over {\Delta {{\overline v }_{Balmer}}}}$ is :
A.
9 : 4
B.
4 : 1
C.
27 : 5
D.
5 : 4
2019 JEE Mains MCQ
JEE Main 2019 (Online) 8th April Evening Slot
If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength $\lambda $, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function)
A.
1/2 $\lambda $
B.
3/4 $\lambda $
C.
4/9 $\lambda $
D.
2/3 $\lambda $
2019 JEE Mains MCQ
JEE Main 2019 (Online) 8th April Morning Slot
The quantum number of four electrons are given below :
n = 4, l = 2, ml =–2, ms = –1/2
n = 3, l = 2, ml = 1, ms = +1/2
n = 4, l = 1, ml = 0, ms = +1/2
n = 3, l = 1, ml = 1, ms = –1/2
The correct order of their increasing enegies will be :
A.
IV < II < III < I
B.
I < III < II < IV
C.
IV < III < II < I
D.
I < II < III < IV
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th January Evening Slot
If the de Broglie wavelength of the electron in nth Bohr orbit in a hydrogenic atom is equal to 1.5 $\pi $a0 (a0 is Bohr radius), then the value of n/z is -
A.
0.75
B.
0.40
C.
1.50
D.
1.0
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The upper stratosphere consisting of the ozone layer protects us from sun's radiation that falls in the wavelength region of -
A.
200-315 nm
B.
400-550 nm
C.
0.8-1.5 nm
D.
600-750 nm
2019 JEE Mains MCQ
JEE Main 2019 (Online) 12th January Morning Slot
What is the work function of the metal if the light of wavelength 4000$\mathop A\limits^ \circ $ generates photoelectrons of velocity 6 $ \times $ 105 ms–1 from it ?
(Mass of electron = 9 $ \times $ 10–31 kg;
Velocity of light = 3 $ \times $ 108 ms$-$1
Plank's constant = 6.626 $ \times $ 10–34 Js;
Charge of electron = 1.6 $ \times $10–19 JeV–1)
A.
4.0 eV
B.
0.9 eV
C.
2.1 eV
D.
3.1 eV
2019 JEE Mains MCQ
JEE Main 2019 (Online) 11th January Evening Slot
The de Broglie wavelength ($\lambda $) associated with a photoelectron varies with the frequency (v) of the incident radiation as, [v0 is threshold frequency] :
A.
$\lambda \,\infty \,{1 \over {{{\left( {v - {v_0}} \right)}^{{3 \over 2}}}}}$
B.
$\lambda \,\infty \,{1 \over {{{\left( {v - {v_0}} \right)}^{{1 \over 4}}}}}$
C.
$\lambda \,\infty \,{1 \over {\left( {v - {v_0}} \right)}}$
D.
$\lambda \,\infty \,{1 \over {{{\left( {v - {v_0}} \right)}^{{1 \over 2}}}}}$
2019 JEE Mains MCQ
JEE Main 2019 (Online) 11th January Morning Slot
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this purpose?

[RH = 1 $ \times $ 105 cm–1, h = 6.6 $ \times $ 10–34 Js, c = 3 $ \times $ 108 ms–1]
A.
Balmer, $\infty $ $ \to $ 2
B.
Paschen, 5 $ \to $ 3
C.
Paschen, $\infty $ $ \to $ 3
D.
Lyman, $\infty $ $ \to $ 1
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th January Evening Slot
The ground state energy of hydrogen atom is – 13.6 eV. The energy of second excited state of He+ ion in eV is :
A.
$-$ 6.04
B.
$-$ 54.4
C.
$-$ 27.2
D.
$-$ 3.4
2019 JEE Mains MCQ
JEE Main 2019 (Online) 10th January Morning Slot
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface ?
A.
JEE Main 2019 (Online) 10th January Morning Slot Chemistry - Structure of Atom Question 168 English Option 1
B.
JEE Main 2019 (Online) 10th January Morning Slot Chemistry - Structure of Atom Question 168 English Option 2
C.
JEE Main 2019 (Online) 10th January Morning Slot Chemistry - Structure of Atom Question 168 English Option 3
D.
JEE Main 2019 (Online) 10th January Morning Slot Chemistry - Structure of Atom Question 168 English Option 4
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th January Evening Slot
Which of the following combination of statements is true regarding the interpretation of the atomic orbitals ?

(a) An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum.

(b) For a given value of the principal quantum number, the size of the orbit is inversely proportional to the azimuthal quantum number.

(c) According to wave mechanics, the ground state angular momentum is equal to ${h \over {2\pi }}$.

(d) The plot of $\psi $ vs r for various azimuthal quantum numbers, shows peak shifting towards higher r value.
A.
(a), (b)
B.
(a), (d)
C.
(b), (c)
D.
(a), (c)
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th January Morning Slot
The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is :
A.
5.92
B.
6.93
C.
3.87
D.
4.90
2019 JEE Mains MCQ
JEE Main 2019 (Online) 9th January Morning Slot
For emission line of atomic hydrogen from ni = 8 to nf = n, the plot of wave number $\left( {\overline v } \right)$ against $\left( {{1 \over {{n^2}}}} \right)$ will be (The Rydberg constant, RH is in wave number unit)
A.
Linear with intercept $-$RH
B.
Non linear
C.
Linear with slope RH
D.
Linear with slope $-$RH
2018 JEE Mains MCQ
JEE Main 2018 (Online) 16th April Morning Slot
Which of the following statements is false ?
A.
Photon has momentum as well as wavelength.
B.
Splitting of spectral lines in electrical field is called Stark effect.
C.
Rydberg constant has unit of energy.
D.
Frequency of emitted radiation from a black body goes from a lower wavelength to higher wavelength as the temperature increases.
2018 JEE Mains MCQ
JEE Main 2018 (Online) 15th April Evening Slot
The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :
A.
0.529 $\mathop {\rm A}\limits^ \circ $
B.
2$\pi $ $ \times $ 0.529 $\mathop {\rm A}\limits^ \circ $
C.
${{0.529} \over {2\pi }}$ $\mathop {\rm A}\limits^ \circ $
D.
4 $ \times $ 0.529 $\mathop {\rm A}\limits^ \circ $
2018 JEE Mains MCQ
JEE Main 2018 (Online) 15th April Morning Slot
Ejection of the photoelectron from metal in the photoelectric experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :
A.
4 eV
B.
4.5 eV
C.
5 eV
D.
5.5 eV
2017 JEE Mains MCQ
JEE Main 2017 (Online) 9th April Morning Slot
The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius 211.6 pm. This transition is associated with :
A.
Lyman series
B.
Balmer series
C.
Paschen series
D.
Brackett series
2017 JEE Mains MCQ
JEE Main 2017 (Online) 8th April Morning Slot
If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of He+ is :
A.
${{5A} \over 9}$
B.
${{9A} \over 5}$
C.
${{36A} \over 5}$
D.
${{36A} \over 7}$
2017 JEE Mains MCQ
JEE Main 2017 (Offline)
The radius of the second Bohr orbit for hydrogen atom is:
(Planck’s Const. h = 6.6262 × 10-34 Js; mass of electron = 9.1091 × 10-31 kg; charge of electron (e) = 1.60210 × 10-19 C; permittivity of vacuum (${\varepsilon _0}$) = 8.854185 × 10-12 kg-1 m-3 A2)
A.
4.76 $\mathop {\rm A}\limits^o $
B.
2.12 $\mathop {\rm A}\limits^o $
C.
0.529 $\mathop {\rm A}\limits^o $
D.
1.65 $\mathop {\rm A}\limits^o $
2017 JEE Mains MCQ
JEE Main 2017 (Offline)
The group having isoelectronic species is:
A.
O2- , F- , Na+, Mg2+
B.
O2- , F- , Na, Mg2+
C.
O- , F- , Na+, Mg2+
D.
O- , F- , Na, Mg+
2016 JEE Mains MCQ
JEE Main 2016 (Online) 9th April Morning Slot
The total number of orbitals associated with the principal quantum number 5 is :
A.
5
B.
10
C.
20
D.
25
2016 JEE Mains MCQ
JEE Main 2016 (Offline)
A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h / $\lambda $ (where $\lambda $ is wavelength associated with electron wave) is given by :
A.
2meV
B.
$\sqrt {meV} $
C.
$\sqrt {2meV} $
D.
meV
2015 JEE Mains MCQ
JEE Main 2015 (Offline)
Which of the following is the energy of a possible excited state of hydrogen?
A.
–6.8 eV
B.
–3.4 eV
C.
+6.8 eV
D.
+13.6 eV
2014 JEE Mains MCQ
JEE Main 2014 (Offline)
The correct set of four quantum numbers for the valence elections of rubidium atom (Z= 37) is:
A.
5, 1, 1, + 1/2
B.
5, 1, 0, + 1/2
C.
5, 0, 0, + 1/2
D.
5, 0, 1, + 1/2
2013 JEE Mains MCQ
JEE Main 2013 (Offline)
Energy of an electron is given by $E = - 2.178 \times {10^{ - 18}}J\left( {{{{Z^2}} \over {{n^2}}}} \right)$. Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be
(h = 6.62 × 10−34 Js and c = 3.0 × 108 ms−1)
A.
2.816 × 10−7 m
B.
6.500 × 10−7 m
C.
8.500 × 10−7 m
D.
1.214 × 10−7 m
2012 JEE Mains MCQ
AIEEE 2012
The electrons identified by quantum numbers n and l :
(a) n = 4, $l$ = 1
(b) n = 4, $ l$ = 0
(c) n = 3, $l$ = 2
(d) n = 3, $l$ = 1
Can be placed in order of increasing energy as :
A.
(c) < (d) < (b) < (a)
B.
(d) < (b) < (c) < (a)
C.
(b) < (d) < (a) < (c)
D.
(a) < (c) < (b) < (d)
2011 JEE Mains MCQ
AIEEE 2011
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at :
A.
325 nm
B.
743 nm
C.
518 nm
D.
1035 nm
2010 JEE Mains MCQ
AIEEE 2010
The energy required to break one mole of Cl–Cl bonds in Cl2 is 242 kJ mol–1. The longest wavelength of light capable of breaking a single Cl – Cl bond is
(c = 3 x 108 ms–1 and NA = 6.02 x 1023 mol–1)
A.
594 nm
B.
640 nm
C.
700 nm
D.
494 nm
2010 JEE Mains MCQ
AIEEE 2010
Ionisation energy of He+ is 19.6 x 10–18 J atom–1. The energy of the first stationary state (n = 1) of Li2+ is
A.
4.41 x 10–16 J atom–1
B.
-4.41 x 10–17 J atom–1
C.
-2.2 x 10–15 J atom–1
D.
8.82 x 10–17 J atom–1
2009 JEE Mains MCQ
AIEEE 2009
In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is (h = 6.6 $\times$ 10-34 kg m2s-1, mass of electron, em = 9.1 $\times$ 10-31 kg)
A.
5.10 $\times$ 10-3 m
B.
1.92 $\times$ 10-3 m
C.
3.84 $\times$ 10-3 m
D.
1.52 $\times$ 10-4 m
2009 JEE Mains MCQ
AIEEE 2009
Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 x 103 ms−1 (Mass of proton = 1.67 $\times$ 10-27 kg and h = 6.63 $\times$ 10-34 Js) :
A.
0.40 nm
B.
2.5 nm
C.
14.0 nm
D.
0.32 nm
2008 JEE Mains MCQ
AIEEE 2008
Which one of the following constitutes a group of the isoelectronic species?
A.
$C_2^{2 - }$, $O_2^{-}$, CO, NO
B.
$NO^{+}$, $C_2^{2 - }$, CN-, $N_2$
C.
CN-, $N_2$, $O_2^{2-}$, $C_2^{2 - }$
D.
$N_2$, $O_2^{-}$, $NO^{+}$, CO
2008 JEE Mains MCQ
AIEEE 2008
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is
A.
8.51 × 105 J mol−1
B.
6.56 × 105 J mol−1
C.
7.56 × 105 J mol−1
D.
9.84 × 105 J mol−1
2007 JEE Mains MCQ
AIEEE 2007
Which of the following sets of quantum numbers represents the highest energy of an atom?
A.
n = 3, l = 0, m = 0, s = +1/ 2
B.
n = 3, l = 1, m = 1, s = +1/ 2
C.
n = 3, l = 2, m = 1, s = +1/ 2
D.
n = 4, l = 0, m = 0, s = +1/ 2
2006 JEE Mains MCQ
AIEEE 2006
Which of the following sets of ions represents a collection of isoelectronic species?
A.
N3-, O2-, F-, S2-
B.
Li+, Na+, Mg2+, Ca2+
C.
K+, Cl-, Ca2+, Sc3+
D.
Ba2+, Sr2+, K+, Ca2+
2006 JEE Mains MCQ
AIEEE 2006
According to Bohr's theory, the angular momentum of an electron in 5th orbit is
A.
10 $h/\pi$
B.
2.5 $h/\pi$
C.
25 $h/\pi$
D.
1.0 $h/\pi$
2006 JEE Mains MCQ
AIEEE 2006
Uncertainty in the position of an electron (mass = 9.1 $\times$ 10-31 kg) moving with a velocity 300 ms-1, accurate upto 0.001% will be (h = 6.63 $\times$ 10-34 Js)
A.
1.92 $\times$ 10-2 m
B.
3.84 $\times$ 10-2 m
C.
19.2 $\times$ 10-2 m
D.
5.76 $\times$ 10-2 m
2005 JEE Mains MCQ
AIEEE 2005
In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?
(A) n = 1, l = 0, m = 0
(B) n = 2, l = 0, m = 0
(C) n = 2, l = 1, m = 1
(D) n = 3, l = 2, m = 1
(E) n = 3, l = 2, m = 0
A.
(D) and (E)
B.
(C) and (D)
C.
(B) and (C)
D.
(A) and (B)
2005 JEE Mains MCQ
AIEEE 2005
Pick out the isoelectronic structure from the following :

$\eqalign{ & \left( i \right)\,\,\,\,\,\,C{H_3}^ + \cr & \left( {ii} \right)\,\,\,\,{H_3}{O^ + } \cr & \left( {iii} \right)\,\,\,N{H_3} \cr & \left( {iv} \right)\,\,\,\,C{H_3}^ - \cr} $
A.
$(i)$ and $(ii)$
B.
$(iii)$ and $(iv)$
C.
$(i)$ and $(iii)$
D.
$(ii), (iii)$ and $(iv)$
2005 JEE Mains MCQ
AIEEE 2005
Of the following sets which one does NOT contain isoelectronic species?
A.
$BO_3^{3 - }$, $CO_3^{2 - }$, $NO_3^{- }$
B.
$SO_3^{2 - }$, $CO_3^{2 - }$, $NO_3^{-}$
C.
$CN^{- }$, $N_2$, $C_2^{2 - }$
D.
$PO_4^{3 - }$, $SO_4^{2 - }$, $ClO_4^{ - }$
2004 JEE Mains MCQ
AIEEE 2004
Which of the following sets of quantum numbers is correct for an electron in 4f orbital?
A.
n = 4, l = 3, m = +1, s = + 1/2
B.
n = 4, l = 4, m = -4, s = - 1/2
C.
n = 4, l = 3, m = +4, s = + 1/2
D.
n = 3, l = 2, m = -2, s = + 1/2
2004 JEE Mains MCQ
AIEEE 2004
Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers, l = 1 and 2 are respectively
A.
16 and 4
B.
12 and 5
C.
12 and 4
D.
16 and 5