# Solved papers for NEET Chemistry Structure of Atom / परमाणु संरचना NEET PYQ-Structure of Atom

### done NEET PYQ-Structure of Atom Total Questions - 54

• question_answer1) Bohr radius for the hydrogen atom $(n=1)$ is approximately $0.530\,\overset{o}{\mathop{A}}\,$. The radius for the first excited state $(n=2)$ orbit is (in $\overset{o}{\mathop{A}}\,$):                             [AIPMT 1998]

A)
0.13

B)
1.06

C)
4.77

D)
2.12

• question_answer2) The position of both, an electron and a helium atom is known within 1.0 mm. Further the momentum of the election is known within $5.0\times {{10}^{-26}}\,kg\,m{{s}^{-1}}$. The minimum uncertainty in the measurement of the momentum of the helium atom is:                                     [AIPMT 1998]

A)
$50\,kg\,m{{s}^{-1}}$

B)
$80\,kg\,m{{s}^{-1}}$

C)
$80\times {{10}^{-26}}\,kg\,m{{s}^{-1}}$

D)
$5.0\times {{10}^{-26}}\,kg\,m{{s}^{-1}}$

• question_answer3) Which one is not paramagnetic among the following?  [Atomic number: $Be=4,\text{ }Ne=10,\text{ }As=33,\,\,~Cl=17$]  [AIPMT 1998]

A)
$C{{l}^{-}}$

B)
Be

C)
$N{{e}^{2+}}$

D)
$A{{s}^{+}}$

• question_answer4) Which of the following configuration is correct for iron?                                          [AIPMT 1999]

A)
$1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}$

B)
$1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }4{{s}^{2}}3{{d}^{5}}$

C)
$1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }4{{s}^{2}}3{{d}^{7}}$

D)
$1{{s}^{2}},\text{ }2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }3{{d}^{6}},\text{ }4{{s}^{2}}$

• question_answer5) Which of the following has more unpaired d-electrons?                               [AIPMT 1999]

A)
$Z{{n}^{+}}$

B)
$F{{e}^{2+}}$

C)
$~{{N}^{3+}}$

D)
$C{{u}^{+}}$

• question_answer6) The uncertainty in momentum of an electron is$1\times {{10}^{-5}}\,m/s$. The uncertainty in its position will be $(h=6.62\times {{10}^{-34}}\,kg\,{{m}^{2}}/s)$:    [AIPMT 1999]

A)
$1.05\times {{10}^{-28}}\,m$

B)
$1.05\times {{10}^{-26}}\,m$

C)
$5.27\times {{10}^{-30}}\,m$

D)
$5.25\times {{10}^{-28}}\,m$

• question_answer7) Who modified Bohr's theory by introducing elliptical orbits for electron path?  [AIPMT 1999]

A)
Hund

B)
Thomson

C)
Rutherford

D)
Sommerfeld

• question_answer8) The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is:         [AIPMT 1999]

A)
$6.63\times {{10}^{-33}}\,m$  B)       $6.63\times {{10}^{-34}}\,m$ C)  $6.63\times {{10}^{-35}}\,m$ D)       $6.65\times {{10}^{-36}}\,m$ View Answer play_arrow question_answer9) The energy of photon is given as: $\Delta e$/atom $=3.03\times {{10}^{-19}}\,J\,ato{{m}^{-1}}$ then, the wavelength $(\lambda )$  of the photon is:                           [AIPMT 2000] A)  6.56 nm B) 65.6 nm C)  656 nm D)  0.656 nm View Answer play_arrow question_answer10) Among    die    following    groupings   which represents    the    collection    of   isoelectronic species?    [AIPMT 2000] A)  $NO,\,C{{N}^{-}},\,{{N}_{2}},\,O_{2}^{-}$ B)       $N{{O}^{+}},\,C_{2}^{2-},\,O_{2}^{-},\,CO$ C)  ${{N}_{2}},\,C_{2}^{2-},\,CO,\,NO$ D)       $CO,\,N{{O}^{+}},\,C{{N}^{-}},\,C_{2}^{2-}$ View Answer play_arrow question_answer11)
The following quantum numbers are possible for how many orbital $n=3,\,\,1=2,\text{ }m=+2:$       [AIPMT 2001]

A)
1

B)
2

C)
3

D)
4

• question_answer12) In hydrogen atom, energy of first excited state is -3.4 eV. Then KE of same orbit of hydrogen atom:      [AIPMT 2002]

A)
+ 3.4 eV

B)
+ 6.8 eV

C)
 13.6 eV

D)
+ 13.6 eV

• question_answer13) General electronic configuration of lanthanides are:                                                [AIPMT 2002]

A)
$(n-2){{f}^{1-14}}(n-1){{s}^{2}}{{p}^{6}}{{d}^{0-1}}n{{s}^{2}}$

B)
$(n-2){{f}^{10-14}}(n-1){{d}^{0-1}}n{{s}^{2}}$

C)
$(n-2){{f}^{0-14}}(n-1){{d}^{10}}n{{s}^{2}}$

D)
$(n-2){{d}^{0-1}}(n-1){{f}^{1-14}}n{{s}^{2}}$

• question_answer14) Which of the following is iso-electronic?                                                                              [AIPMT 2002]

A)
$C{{O}_{2}},\text{ }N{{O}_{2}}$

B)
$NO_{2}^{-},\,C{{O}_{2}}$

C)
$C{{N}^{-}},\text{ }CO$

D)
$S{{O}_{2}},\,C{{O}_{2}}$

• question_answer15) The value of Planck's constant is $6.63\times {{10}^{-34}}Js$. The velocity of light is $3.0\times {{10}^{8}}m{{s}^{-1}}$. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of $8\times {{10}^{15}}{{s}^{-1}}$?                            [AIPMT 2003]

A)
$4\times {{10}^{1}}$

B)
$3\times {{10}^{7}}$

C)
$2\times {{10}^{-25}}$

D)
$5\times {{10}^{-18}}$

• question_answer16) The frequency of radiation emitted when the electron falls from $n=4$ to $n=1$ in a hydrogen atom will be (Given ionisation energy of $H=2.18\,\,{{10}^{-18}}J\,ato{{m}^{-1}}$ and $h=6.625\times {{10}^{-34}}Js):$                                      [AIPMT (S) 2004]

A)
$1.54\times l{{0}^{15}}\text{ }{{s}^{-1}}$

B)
$1.03\times {{10}^{15}}\,\,{{s}^{-1}}$

C)
$3.08\times {{10}^{15}}\text{ }{{s}^{-1}}$

D)
$2.00\times {{10}^{15}}\text{ }{{s}^{-1}}$

• question_answer17) The energy of second Bohr orbit of the hydrogen atom is $\text{ }328\text{ }kJ\text{ }mo{{l}^{-1}};$ hence the energy of fourth Bohr orbit would be:                                                                      [AIPMT (S) 2005]

A)
$-\,41\text{ }kJ\text{ }mo{{l}^{-1}}$

B)
$-\,1312\text{ }kJ\text{ }mo{{l}^{-1}}$

C)
$-\,164\text{ }kJ\text{ }mo{{l}^{-1}}$

D)
$-\,82\text{ }kJ\text{ }mo{{l}^{-1}}$

• question_answer18) Given:   The mass of electron is $9.11\times {{10}^{-31}}kg$ Planck constant is $6.626\times {{10}^{-34}}Js$, the uncertainty involved in the measurement of velocity within a distance of $0.1\,\,\overset{o}{\mathop{A}}\,$ is :                                                                                                                                               [AIPMT (S) 2006]

A)
$5.79\times {{10}^{6}}m{{s}^{-1}}$

B)
$5.79\times {{10}^{{}}}m{{s}^{-1}}$

C)
$5.79\times {{10}^{8}}m{{s}^{-1}}$

D)
$5.79\times {{10}^{5}}m{{s}^{-1}}$

• question_answer19) The orientation of an atomic orbital is governed by:                              [AIPMT (S) 2006]

A)
azimuthal quantum number

B)
spin quantum number

C)
magnetic quantum number

D)
principal quantum number

• question_answer20)  Consider die following sets of quantum numbers:                                                     [AIPMT (S) 2007] $n$      $l$       $m$        $s$ (i)         3          0          0          $+1/2$ (ii)         2          2          1          $+1/2$ (iii)        4          3           2        $-1/2$ (iv)        1          0           1        $-1/2$ (v)        3          2          3          $+1/2$ Which of the following sets of quantum number is not possible?

A)
ii, iii and iv

B)
i, ii, iii and iv

C)
ii, iv and v

D)
i and iii

• question_answer21) If uncertainty in position and momentum are equal, then uncertainty in velocity is                   [AIPMT (S) 2008]

A)
$\frac{1}{2m}\sqrt{\frac{h}{\pi }}$

B)
$\sqrt{\frac{h}{2\pi }}$

C)
$\frac{1}{m}\sqrt{\frac{h}{\pi }}$

D)
$\sqrt{\frac{h}{\pi }}$

• question_answer22) The measurement of the electron position is associated with an uncertainty in momentum, which is equal to $1\times {{10}^{-18}}g\,cm\,{{s}^{-1}}$. The uncertainty in electron velocity is, (mass of an electron is $9\times {{10}^{-28}}g$)          [AIPMT (S) 2008]

A)
$1\times {{10}^{9}}cm\,{{s}^{-1}}$

B)
$1\times {{10}^{6}}cm\,{{s}^{-1}}$

C)
$1\times {{10}^{5}}cm\,{{s}^{-1}}$

D)
$1\times {{10}^{11}}cm\,{{s}^{-1}}$

• question_answer23) Maximum number of electrons in a subshell of, an atom is determined by the following            [AIPMT (S) 2009]

A)
$4\,l+2$

B)
$2\,l+1$

C)
$4\,l-2$

D)
$2\,{{n}^{2}}$

• question_answer24) Which of the following is not permissible arrangement of electrons in an atom?                        [AIPMT (S) 2009]

A)
$n=4,\,l=0,\,m=0,\,s=-1/2$

B)
$n=5,\,l=3,\,m=0,\,s=+1/2$

C)
$n=3,\,l=2,\,m=-3,\,s=-1/2$

D)
$n=3,\,l=2,\,m=-2,\,s=-1/2$

• question_answer25)  Which one of the following ions has electronic configuration$[Ar]\text{ }3{{d}^{6}}$? (At. no: Mn = 25, Fe = 26, Co = 27, Ni = 28)                                                                  [AIPMT (S) 2010]

A)
$N{{i}^{3+}}$

B)
$M{{n}^{3+}}$

C)
$F{{e}^{3+}}$

D)
$C{{o}^{3+}}$

• question_answer26) A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be$(h=6.6\times {{10}^{-34}}Js)$     [AIPMT (M) 2010]

A)
$6.6\times {{10}^{-32}}m$

B)
$6.6\times {{10}^{-34}}m$

C)
$1.0\times {{10}^{-35}}m$

D)
$1.0\times {{10}^{-32}}m$

• question_answer27) The total number of atomic orbitals in fourth energy level of an atom is                                             [AIPMT (S) 2011]

A)
16

B)
32

C)
4

D)
8

• question_answer28) The energies ${{E}_{1}}$ and ${{E}_{2}}$ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., ${{\lambda }_{1}}$ and ${{\lambda }_{2}}$will be                               [AIPMT (S) 2011]

A)
${{\lambda }_{1}}=2{{\lambda }_{2}}$

B)
${{\lambda }_{1}}=4{{\lambda }_{2}}$

C)
${{\lambda }_{1}}=\frac{1}{2}{{\lambda }_{2}}$

D)
${{\lambda }_{1}}={{\lambda }_{2}}$

• question_answer29) If $n=6,$ the correct sequence for filling of electrons will be                                                 [AIPMT (S) 2011]

A)
$ns\xrightarrow[{}]{{}}(n-1)d\xrightarrow[{}]{{}}(n-2)f\xrightarrow[{}]{{}}np$

B)
$ns-(n-2)f\xrightarrow[{}]{{}}np\xrightarrow[{}]{{}}(n-1)d$

C)
$ns-np\xrightarrow[{}]{{}}(n-1)d\xrightarrow[{}]{{}}(n-2)f$

D)
$ns\xrightarrow[{}]{{}}(n-2)f\xrightarrow[{}]{{}}(n-1)d\xrightarrow[{}]{{}}np$

• question_answer30)  According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?                                                                                                                          [AIPMT (M) 2011]

A)
$n=6$ to $n=1$

B)
$n=5$ to $n=4$

C)
$n=6$ to $n=5$

D)
$n=5$ to $n=3$

• question_answer31) Maximum number of electrons in a sub shell with $l=3$ and $n=4$ is                                  [AIPMT (S) 2012]

A)
14

B)
16

C)
10

D)
12

• question_answer32) The correct set of four quantum numbers for the valence electron of rubidium atom $(Z=37)$is            [AIPMT (S) 2012]

A)
$5,1,1,+\frac{1}{2}$

B)
$6,0,0,+\frac{1}{2}$

C)
$5,0,0,+\frac{1}{2}$

D)
$5,1,0,+\frac{1}{2}$

• question_answer33) The orbital angular momentum of p-electron is given as                                   [AIPMT (M) 2012]

A)
$\frac{h}{\sqrt{2\pi }}$

B)
$\sqrt{3}\frac{h}{2\pi }$

C)
$\sqrt{\frac{3}{2}}\frac{h}{\pi }$

D)
$\sqrt{6}.\frac{h}{2\pi }$

• question_answer34) The value of Planck's constant is $6.63\times {{10}^{-34}}Js$. The speed of light is $3\times {{10}^{17}}nm{{s}^{-1}}$. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of $6\times {{10}^{15}}{{s}^{-1}}$?                                                                                       [NEET 2013]

A)
10

B)
25

C)
50

D)
75

• question_answer35) What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? $n=3,l=1$ and $m=-1$                                                                                                                        [NEET 2013]

A)
10

B)
6

C)
4

D)
2

• question_answer36) Based on equation $E=-2.178\times {{10}^{-18}}J\left( \frac{{{Z}^{2}}}{{{n}^{2}}} \right)$certain con-elusions are written. Which of them is not correct?                                                                                            [NEET 2013]

A)
The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus

B)
Larger the value of n, the larger is the orbit radius

C)
Equation can be used to calculate the change in energy when the electron changes orbit

D)
For $n=1$ the electron has a more negative energy than it does for $n=6$ which means that the electron is more

• question_answer37)  Which of the following lanthanides ions is diamagnetic?                                                                    [NEET 2013] (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb=70)

A)
$C{{e}^{2+}}$

B)
$S{{m}^{2+}}$

C)
$E{{u}^{2+}}$

D)
$Y{{b}^{2+}}$

• question_answer38)  What is the maximum number of orbitals that can be identified with the following quantum numbers?    [AIPMT 2014] $n=3,l=1,{{m}_{l}}=0$

A)
1

B)
2

C)
3

D)
4

• question_answer39) Calculate the energy in joule corresponding to light of wavelength 45 nm : (Planck's constant $h=6.63\times {{10}^{-34}}$ is;   speed   of   light$c=3\times {{10}^{8}}m{{s}^{-1}})$                                                   [AIPMT 2014]

A)
$6.67\times {{10}^{15}}$

B)
$6.67\times {{10}^{11}}$

C)
$4.42\times {{10}^{-15}}$

D)
$4.42\times {{10}^{-18}}$

• question_answer40) $B{{e}^{2+}}$ is isoelectronic with which of the following ions?                                          [AIPMT 2014]

A)
${{H}^{+}}$

B)
$L{{i}^{+}}$

C)
$N{{a}^{+}}$

D)
$M{{g}^{2+}}$

• question_answer41) Magnetic moment 2.83 BM is given by which of the following ions?             (At. No. : Ti = 22; Cr = 24; Mn = 25; Ni = 28)                                                    [AIPMT 2014]

A)
$T{{i}^{3+}}$

B)
$N{{i}^{2+}}$

C)
$C{{r}^{3+}}$

D)
$M{{n}^{2+}}$

• question_answer42) Magnetic moment 2.84 BM is given by (At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)                        [NEET 2015 ]

A)
$N{{i}^{2+}}$

B)
$T{{i}^{3+}}$

C)
$C{{r}^{3+}}$

D)
$C{{O}^{2+}}$

• question_answer43) The number of d-electrons in $F{{e}^{2+}}\,(Z=26)$ is not equal to the number of electrons in which one of the following?                                                                                                                                                [NEET 2015 ]

A)
s-electrons in $Mg(Z=12)$

B)
p-electrons in $Cl\text{ }(Z=17)$

C)
d-electrons in $Fe(Z=26)$

D)
p-electrons in $Ne(Z=10)$

• question_answer44) The angular momentum of electrons in d orbital is equal to                                                   [NEET 2015 ]

A)
$\sqrt{6}h$

B)
$\sqrt{2}h$

C)
$2\sqrt{3}h$

D)
$0h$

• question_answer45) Gadolinium belongs to $4f$ series. Ifs atomic number is 64. Which of the following is the correct   electronic   configuration   of gadolinium?                                                                                                       [NEET 2015 (Re)]

A)
$[Xe]4{{f}^{8}}6{{d}^{2}}$

B)
$[Xe]4{{f}^{9}}\,5{{s}^{1}}$

C)
$[Xe]4{{f}^{7}}\,5{{d}^{1}}\,6{{s}^{2}}$

D)
$[Xe]\,4{{f}^{6}}5{{d}^{2}}6{{s}^{2}}$

• question_answer46) Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?        [NEET 2015 (Re)]

A)
$3s\text{ }4s\text{ }3p\text{ }3d$

B)
$4s\text{ }3s\text{ }3p\text{ }3d$

C)
$3s\text{ }3p\text{ }3d\text{ }4s$

D)
$3s\text{ }3p\text{ }4s\text{ }3d$

• question_answer47) The electronic configurations of Eu(Atomic No 63), Gd(Atomic No 64) and Tb(Atomic No. 65) are        [NEET - 2016]

A)
$[Xe]4{{f}^{7}}6{{s}^{2}},\text{}[Xe]4{{f}^{8}}\text{}6{{s}^{2}}$and$[Xe]4{{f}^{8}}5{{d}^{1}}6{{s}^{2}}$

B)
$[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}},\text{}[Xe]4{{f}^{7}}\text{}5{{d}^{1}}\text{ }6{{s}^{2}}$ and $[Xe]4{{f}^{9}}6{{s}^{2}}$

C)
$[Xe]4{{f}^{6}}5{{d}^{1}}6{{s}^{2}},\text{}[Xe]4{{f}^{7}}5d16{{s}^{2}}$and$[Xe]4{{f}^{8}}5{{d}^{1}}6{{s}^{2}}$

D)
$[Xe]4{{f}^{7}}6{{s}^{2}},\text{ }[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}$and $[Xe]4{{f}^{9}}6{{s}^{2}}$

• question_answer48) Two electrons occupying the same orbital are distinguished by                                                    [NEET - 2016]

A)
Principal quantum number

B)
Magnetic quantum number

C)
Azimuthal quantum number

D)
Spin quantum number

• question_answer49) Which one is the wrong statement?                                                                                                [NEET-2017]

A)
The energy of 2s orbital is less than the energy of 2p orbital in case of Hydrogen like atoms

B)
de-Broglie's wavelength is given by $\lambda =\frac{h}{mv},$ where m = mass of the particle, v = group velocity of the particle

C)
The uncertainty principle is $\Delta E\times \Delta t\ge \frac{h}{4\pi }$

D)
Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement

Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:                                                                                   [NEET - 2018]
 Column I Column II a. $\text{C}{{\text{o}}^{\text{3+}}}$ i. $\sqrt{\text{8}}\text{ BM}$ b. $\text{C}{{\text{r}}^{\text{3+}}}$ ii. $\sqrt{35}\text{ }BM$ c. $\text{F}{{\text{e}}^{\text{3+}}}$ iii. $\sqrt{3}\text{ }BM$ d. $\text{N}{{\text{i}}^{\text{2+}}}$ iv. $\sqrt{24}\text{ }BM$ v. $\sqrt{15}\text{ }BM$

A)
a-iv      b-i        c-ii       d-iii

B)
a-I        b-ii       c-iii      d-iv

C)
a-iv      b-v       c-ii       d-i

D)
a-iii      b-v       c-I        d-ii

• question_answer51) Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?        [NEET 2019]

A)
Paschen series

B)
Brackett series

C)
Lyman series

D)
Balmer series

• question_answer52) 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is: [NEET 2019]

A)
6p > 5f > 4d > 5p

B)
5f > 6p > 4d > 5p

C)
5f > 6p > 5p > 4d

D)
6p > 5f > 5p > 4d

• question_answer53) The calculated spin only magnetic moment of $C{{r}^{2+}}$ ion is                                  [NEET 2020]

A)
4.90 BM

B)
5.92 BM

C)
2.84 BM

D)
3.87 BM

• question_answer54) The number of protons, neutrons and electrons in $_{\,\,71}^{175}Lu$, respectively, are                  [NEET 2020]

A)
104, 71 and 71

B)
71, 71 and 104

C)
175, 104 and 71

D)
71, 104 and 71