Quiz - chemistry - Structure of Atom-PYQ

Q1. The number of protons, neutrons and electrons in \( ^{175}_{71}\text{Lu} \), respectively, are Source: orcusprep.in

NEET (UG) 2020

easy

71, 104 and 71

104, 71 and 71

71, 71 and 104

175, 104 and 71

Q2. \( \text{Be}^{2+} \) is isoelectronic with which of the following ions? Source: orcusprep.in

NEET (UG) 2014

easy

\( \text{H}^{+} \)

\( \text{Li}^{+} \)

\( \text{Na}^{+} \)

\( \text{Mg}^{2+} \)

Q3. Isoelectronic species are Source: orcusprep.in

NEET (UG) 2000

medium

CO, \( \text{CN}^{-} \), \( \text{NO}^{+} \), \( \text{C}_2^{2-} \)

\( \text{CO}^{-} \), CN, NO, \( \text{C}_2^{-} \)

\( \text{CO}^{+} \), \( \text{CN}^{+} \), \( \text{NO}^{-} \), \( \text{C}_2 \)

CO, CN, NO, \( \text{C}_2 \)

Q4. The ion that is isoelectronic with CO is Source: orcusprep.in

NEET (UG) 1997

easy

\( \text{CN}^{-} \)

\( \text{N}_2^{+} \)

\( \text{O}_2^{-} \)

\( \text{N}_2^{-} \)

Q5. Which one of the following is not isoelectronic with \( \text{O}^{2-} \)? Source: orcusprep.in

NEET (UG) 1994

easy

\( \text{Tl}^{+} \)

\( \text{Na}^{+} \)

\( \text{N}^{3-} \)

\( \text{F}^{-} \)

Q6. Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region? Source: orcusprep.in

NEET (UG) 2019

easy

Brackett series

Lyman series

Balmer series

Paschen series

Q7. Calculate the energy in joule corresponding to light of wavelength 45 nm.
(Planck’s constant, h = \( 6.63 \times 10^{-34} \) J s, speed of light, c = \( 3 \times 10^8 \) m \( \text{s}^{-1} \)) Source: orcusprep.in

NEET (UG) 2014

medium

\( 6.67 \times 10^{15} \)

\( 6.67 \times 10^{11} \)

\( 4.42 \times 10^{-15} \)

\( 4.42 \times 10^{-18} \)

Q8. The value of Planck’s constant is \( 6.63 \times 10^{-34} \) Js. The speed of light is \( 3 \times 10^{17} \) nm \( \text{s}^{-1} \). Which value is closest to the wavelength in nanometer of a quantum of light with frequency of \( 6 \times 10^{15} \) \( \text{s}^{-1} \)? Source: orcusprep.in

NEET (UG) 2013

medium

50

75

10

25

Q9. According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as
(h = \( 6.62 \times 10^{-27} \) ergs, c = \( 3 \times 10^{10} \) cm \( \text{s}^{-1} \), \( \text{N}_A = 6.02 \times 10^{23} \) \( \text{mol}^{-1} \)) Source: orcusprep.in

NEET (UG) 2013 (Karnataka)

medium

\( \frac{1.196 \times 10^8}{\lambda} \)

\( \frac{2.859 \times 10^5}{\lambda} \)

\( \frac{2.859 \times 10^{16}}{\lambda} \)

\( \frac{1.196 \times 10^{16}}{\lambda} \)

Q10. The energies \( \text{E}_1 \) and \( \text{E}_2 \) of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., \( \lambda_1 \) and \( \lambda_2 \) will be Source: orcusprep.in

NEET (UG) 2011

easy

\( \lambda_1 = \lambda_2 \)

\( \lambda_1 = 2\lambda_2 \)

\( \lambda_1 = 4\lambda_2 \)

\( \frac{\lambda_1}{\lambda_2} = \frac{1}{2} \)

Q11. The value of Planck’s constant is \( 6.63 \times 10^{-34} \) J s. The velocity of light is \( 3.0 \times 10^8 \) m \( \text{s}^{-1} \). Which value is closest to the wavelength in nanometers of a quantum of light with frequency of \( 8 \times 10^{15} \) \( \text{s}^{-1} \)? Source: orcusprep.in

NEET (UG) 2003

medium

\( 2 \times 10^{-25} \)

\( 5 \times 10^{-18} \)

\( 4 \times 10^1 \)

\( 3 \times 10^7 \)

Q12. For given energy, E = \( 3.03 \times 10^{-19} \) joules corresponding wavelength is
(h = \( 6.626 \times 10^{-34} \) J sec, c = \( 3 \times 10^8 \) m/sec) Source: orcusprep.in

NEET (UG) 2000

medium

65.6 nm

6.56 nm

3.4 nm

656 nm

Q13. What will be the longest wavelength line in Balmer series of spectrum? Source: orcusprep.in

NEET (UG) 1996

medium

546 nm

656 nm

566 nm

556 nm

Q14. In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is
[Given that Bohr radius, \( a_0 \) = 52.9 pm] Source: orcusprep.in

NEET (UG) 2019 (Odisha)

medium

211.6 pm

211.6 \( \pi \) pm

52.9 \( \pi \) pm

105.8 pm

Q15. A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be
(h = \( 6.6 \times 10^{-34} \) J s) Source: orcusprep.in

NEET (UG) 2010 (Mains)

medium

\( 6.6 \times 10^{-32} \) m

\( 6.6 \times 10^{-34} \) m

\( 1.0 \times 10^{-35} \) m

\( 1.0 \times 10^{-32} \) m

Q16. If uncertainty in position and momentum are equal, then uncertainty in velocity is Source: orcusprep.in

NEET (UG) 2008

medium

\( \frac{1}{m}\sqrt{\frac{h}{\pi}} \)

\( \frac{h}{\pi} \)

\( \frac{1}{2m}\sqrt{\frac{h}{\pi}} \)

\( \frac{h}{2\pi} \)

Q17. The measurement of the electron position is associated with an uncertainty in momentum, which is equal to \( 1 \times 10^{-18} \) g cm \( \text{s}^{-1} \). The uncertainty in electron velocity is (mass of an electron is \( 9 \times 10^{-28} \) g) Source: orcusprep.in

NEET (UG) 2008

easy

\( 1 \times 10^{5} \) cm \( \text{s}^{-1} \)

\( 1 \times 10^{11} \) cm \( \text{s}^{-1} \)

\( 1 \times 10^{9} \) cm \( \text{s}^{-1} \)

\( 1 \times 10^{6} \) cm \( \text{s}^{-1} \)

Q18. Based on equation \( E_n = -2.178 \times 10^{-18} \left(\frac{\text{Z}^2}{\text{n}^2}\right) \text{ J} \), certain conclusions are written. Which of them is not correct? Source: orcusprep.in

NEET (UG) 2013

medium

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

For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.

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.

Larger the value of n, the larger is the orbit radius.

Q19. According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon? Source: orcusprep.in

NEET (UG) 2011 (Mains)

medium

n = 6 to n = 1

n = 5 to n = 4

n = 6 to n = 5

n = 5 to n = 3

Q20. The energy of second Bohr orbit of the hydrogen atom is \( -328 \text{ kJ mol}^{-1} \); hence the energy of fourth Bohr orbit would be Source: orcusprep.in

NEET (UG) 2005

medium

\( -41 \text{ kJ mol}^{-1} \)

\( -82 \text{ kJ mol}^{-1} \)

\( -164 \text{ kJ mol}^{-1} \)

\( -1312 \text{ kJ mol}^{-1} \)

Q21. The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be
(Given ionization energy of H = \( 2.18 \times 10^{-18} \) J \( \text{atom}^{-1} \) and h = \( 6.626 \times 10^{-34} \) J s) Source: orcusprep.in

NEET (UG) 2004

hard

\( 1.54 \times 10^{15} \) \( \text{s}^{-1} \)

\( 1.03 \times 10^{15} \) \( \text{s}^{-1} \)

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

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

Q22. In hydrogen atom, energy of first excited state is \( -3.4 \) eV. Then find out K.E. of same orbit of hydrogen atom. Source: orcusprep.in

NEET (UG) 2002

easy

+3.4 eV

+6.8 eV

\( -13.6 \) eV

+13.6 eV

Q23. Who modified Bohr’s theory by introducing elliptical orbits for electron path? Source: orcusprep.in

NEET (UG) 1999

easy

Rutherford

Thomson

Hund

Sommerfeld

Q24. The Bohr orbit radius for the hydrogen atom (n = 1) is approximately \( 0.530 \) Å. The radius for the first excited state (n = 2) orbit is (in Å) Source: orcusprep.in

NEET (UG) 1998

easy

4.77

1.06

0.13

2.12

Q25. In a Bohr’s model of an atom, when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed? Source: orcusprep.in

NEET (UG) 1996

medium

\( 2.389 \times 10^{-12} \) ergs

\( 0.239 \times 10^{-10} \) ergs

\( 2.15 \times 10^{-11} \) ergs

\( 0.1936 \times 10^{-10} \) ergs

Q26. The radius of hydrogen atom in the ground state is \( 0.53 \) Å. The radius of \( \text{Li}^{2+} \) ion (atomic number = 3) in a similar state is Source: orcusprep.in

NEET (UG) 1995

medium

\( 0.53 \) Å

\( 1.06 \) Å

\( 0.17 \) Å

\( 0.265 \) Å

Q27. The energy of an electron in the nth Bohr orbit of hydrogen atom is Source: orcusprep.in

NEET (UG) 1992

easy

\( \frac{13.6}{n^4} \) eV

\( \frac{13.6}{n^3} \) eV

\( \frac{13.6}{n^2} \) eV

\( \frac{13.6}{n} \) eV

Q28. The spectrum of He is expected to be similar to that Source: orcusprep.in

NEET (UG) 1988

easy

H

\( \text{Li}^{+} \)

Na

\( \text{He}^{+} \)

Q29. If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by Source: orcusprep.in

NEET (UG) 1988

easy

\( \text{rn}^2 \)

rn

r/n

\( \text{r}^2\text{n}^2 \)

Q30. Given : The mass of electron is \( 9.11 \times 10^{-31} \) kg, Planck constant is \( 6.626 \times 10^{-34} \) J s, the uncertainty involved in the measurement of velocity within a distance of \( 0.1 \) Å is Source: orcusprep.in

NEET (UG) 2006

medium

\( 5.79 \times 10^{5} \) m \( \text{s}^{-1} \)

\( 5.79 \times 10^{6} \) m \( \text{s}^{-1} \)

\( 5.79 \times 10^{7} \) m \( \text{s}^{-1} \)

\( 5.79 \times 10^{8} \) m \( \text{s}^{-1} \)

Q31. The uncertainty in momentum of an electron is \( 1 \times 10^{-5} \) kg m/s. The uncertainty in its position will be
(h = \( 6.62 \times 10^{-34} \) kg \( \text{m}^2 \)/s) Source: orcusprep.in

NEET (UG) 1999

easy

\( 5.27 \times 10^{-30} \) m

\( 1.05 \times 10^{-26} \) m

\( 1.05 \times 10^{-28} \) m

\( 5.25 \times 10^{-28} \) m

Q32. The de Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is Source: orcusprep.in

NEET (UG) 1999

easy

\( 6.63 \times 10^{-35} \) m

\( 6.63 \times 10^{-34} \) m

\( 6.63 \times 10^{-33} \) m

\( 6.65 \times 10^{-35} \) m

Q33. The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within \( 5.0 \times 10^{-26} \) kg m \( \text{s}^{-1} \). The minimum uncertainty in the measurement of the momentum of the helium atom is Source: orcusprep.in

NEET (UG) 1998

hard

\( 8.0 \times 10^{-26} \) kg m \( \text{s}^{-1} \)

80 kg m \( \text{s}^{-1} \)

50 kg m \( \text{s}^{-1} \)

\( 5.0 \times 10^{-26} \) kg m \( \text{s}^{-1} \)

Q34. Uncertainty in position of an electron (Mass = \( 9.1 \times 10^{-28} \) g) moving with a velocity of \( 3 \times 10^{4} \) cm/s accurate upto 0.001% will be
(Use h/(4\( \pi \)) in uncertainty expression where h = \( 6.626 \times 10^{-27} \) erg second) Source: orcusprep.in

NEET (UG) 1995

hard

5.76 cm

7.68 cm

1.93 cm

3.84 cm

Q35. Which of the following statements do not form a part of Bohr’s model of hydrogen atom? Source: orcusprep.in

NEET (UG) 1989

easy

Energy of the electrons in the orbits are quantized.

The electron in the orbit nearest the nucleus has the lowest energy.

Electrons revolve in different orbits around the nucleus.

The position and velocity of the electrons in the orbit cannot be determined simultaneously.

Q36. 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is Source: orcusprep.in

NEET (UG) 2019

medium

5f > 6p > 4d > 5p

5f > 6p > 5p > 4d

6p > 5f > 5p > 4d

6p > 5f > 4d > 5p

Q37. Orbital having 3 angular nodes and 3 total nodes is Source: orcusprep.in

NEET (UG) 2019 (Odisha)

easy

5p

3d

4f

6d

Q38. Which one is a wrong statement? Source: orcusprep.in

NEET (UG) 2018

hard

Total orbital angular momentum of electron in s-orbital is equal to zero.

An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.

The electronic configuration of N atom is \( 1s^{2} 2s^{2} 2p_x^{1} 2p_y^{1} 2p_z^{1} \)

The value of m for \( d_{z^2} \) is zero.

Q39. Which one is the wrong statement? Source: orcusprep.in

NEET (UG) 2017

medium

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

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

The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.

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

Q40. How many electrons can fit in the orbital for which n = 3 and l = 1? Source: orcusprep.in

NEET (UG) 2016 (NEET-II)

easy

2

6

10

14

Q41. Which of the following pairs of d-orbitals will have electron density along the axes? Source: orcusprep.in

NEET (UG) 2016 (NEET-II)

easy

\( d_{z^2}, d_{xz} \)

\( d_{xz}, d_{yz} \)

\( d_{z^2}, d_{x^2 - y^2} \)

\( d_{xy}, d_{x^2 - y^2} \)

Q42. Two electrons occupying the same orbital are distinguished by Source: orcusprep.in

NEET (UG) 2016 (NEET-I)

easy

azimuthal quantum number

spin quantum number

principal quantum number

magnetic quantum number.

Q43. Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. Z = 22) Source: orcusprep.in

NEET (UG) 2015

medium

\( 4s < 3s < 3p < 3d \)

\( 3s < 3p < 3d < 4s \)

\( 3s < 3p < 4s < 3d \)

\( 3s < 4s < 3p < 3d \)

Q44. The number of d-electrons in \( \text{Fe}^{2+} \) (Z = 26) is not equal to the number of electrons in which one of the following? Source: orcusprep.in

NEET 2015

medium

d-electrons in Fe (Z = 26)

p-electrons in Ne (Z = 10)

s-electrons in Mg (Z = 12)

p-electrons in Cl (Z=17)

Q45. The angular momentum of electron in ‘d’ orbital is equal to Source: orcusprep.in

NEET 2015

easy

\( \sqrt{6} \frac{h}{2\pi} \)

\( \sqrt{2} \frac{h}{2\pi} \)

\( 2 \frac{h}{2\pi} \)

\( 0 \frac{h}{2\pi} \)

Q46. What is the maximum number of orbitals that can be identified with the following quantum numbers?
n = 3, l = 1, \( m_l \) = 0 Source: orcusprep.in

NEET 2014

easy

1

2

3

4

Q47. 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 Source: orcusprep.in

NEET 2013

easy

4

2

10

6

Q48. The outer electronic configuration of Gd (At. No. 64) is Source: orcusprep.in

NEET 2013 (Karnataka)

hard

\( 4f^{5} 5d^{4} 6s^{1} \)

\( 4f^{7} 5d^{1} 6s^{2} \)

\( 4f^{3} 5d^{5} 6s^{2} \)

\( 4f^{4} 5d^{5} 6s^{1} \)

Q49. Maximum number of electrons in a subshell with l = 3 and n = 4 is Source: orcusprep.in

NEET 2012

easy

14

16

10

12

Q50. The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is Source: orcusprep.in

NEET 2012

easy

5, 1, 1, +1/2

6, 0, 0, +1/2

5, 0, 0, +1/2

5, 1, 0, +1/2

Q51. The orbital angular momentum of a p-electron is given as Source: orcusprep.in

NEET 2012 (Mains)

hard

\( \frac{h}{2\pi} \)

\( \frac{\sqrt{3}}{2} \frac{h}{\pi} \)

\( \frac{\sqrt{6}}{2} \frac{h}{\pi} \)

Q52. The total number of atomic orbitals in fourth energy level of an atom is Source: orcusprep.in

NEET 2011

easy

8

16

32

4

Q53. If n = 6, the correct sequence for filling of electrons will be Source: orcusprep.in

NEET 2011

medium

ns → (n – 2)f → (n – 1)d → np

ns → (n – 1)d → (n – 2)f → np

ns → (n – 2)f → np → (n – 1)d

ns → np → (n – 1)d → (n – 2)f

Q54. Maximum number of electrons in a subshell of an atom is determined by the following Source: orcusprep.in

NEET 2009

easy

\( 2l + 1 \)

\( 4l - 2 \)

\( 2n^{2} \)

\( 4l + 2 \)

Q55. Which of the following is not permissible arrangement of electrons in an atom? Source: orcusprep.in

NEET 2009

medium

n = 5, l = 3, m = 0, s = +1/2

n = 3, l = 2, m = –3, s = –1/2

n = 3, l = 2, m = –2, s = –1/2

n = 4, l = 0, m = 0, s = –1/2

Q56. Consider the following sets of quantum numbers:
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? Source: orcusprep.in

NEET 2007

medium

(i), (ii), (iii) and (iv)

(ii), (iv) and (v)

(i) and (iii)

(ii), (iii) and (iv)

Q57. The orientation of an atomic orbital is governed by Source: orcusprep.in

NEET 2006

easy

principal quantum number

azimuthal quantum number

spin quantum number

magnetic quantum number.

Q58. The following quantum numbers are possible for how many orbitals?
n = 3, l = 2, m = +2 Source: orcusprep.in

NEET 2001

easy

1

2

3

4

Q59. For which of the following sets of four quantum numbers, an electron will have the highest energy? Source: orcusprep.in

NEET 1994

medium

n = 3, l = 2, m = 1, s = +1/2

n = 4, l = 2, m = – 1, s = +1/2

n = 4, l = 1, m = 0, s = –1/2

n = 5, l = 0, m = 0, s = –1/2

Q60. Electronic configuration of calcium atom can be written as Source: orcusprep.in

NEET 1992

easy

\( [Ne]4p^{2} \)

\( [Ar]4s^{2} \)

\( [Ne]4s^{2} \)

\( [Kr]4p^{2} \)

Q61. In a given atom no two electrons can have the same values for all the four quantum numbers. This is called Source: orcusprep.in

NEET 1991

easy

Hund’s Rule

Aufbau principle

Uncertainty principle

Pauli’s Exclusion principle.

Q62. For azimuthal quantum number l = 3, the maximum number of electrons will be Source: orcusprep.in

NEET 1991

easy

2

6

0

14

Q63. The order of filling of electrons in the orbitals of an atom will be Source: orcusprep.in

NEET 1991

medium

3d, 4s, 4p, 4d, 5s

4s, 3d, 4p, 5s, 4d

5s, 4p, 3d, 4d, 5s

3d, 4p, 4s, 4d, 5s

Q64. The electronic configuration of Cu (atomic number 29) is Source: orcusprep.in

NEET 1991

medium

\( 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{9} \)

\( 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{1} \)

\( 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 4p^{6} 5s^{2} 5p^{1} \)

\( 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 4p^{6} 3d^{3} \)

Q65. The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 are Source: orcusprep.in

NEET 1990

easy

2

4

6

8

Q66. An ion has 18 electrons in the outermost shell, it is Source: orcusprep.in

NEET 1990

medium

\( Cu^{+} \)

\( Th^{4+} \)

\( Cs^{+} \)

\( K^{+} \)

Q67. Number of unpaired electrons in \( N_{2}^{+} \) is/are Source: orcusprep.in

NEET 1989

medium

2

0

1

3

Q68. The maximum number of electrons in a subshell is given by the expression Source: orcusprep.in

NEET 1989

easy

\( 4l - 2 \)

\( 4l + 2 \)

\( 2l + 2 \)

\( 2n^{2} \)

Q69. The number of spherical nodes in 3p orbitals are/is Source: orcusprep.in

NEET 1988

easy

one

three

none

two

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Chemistry - Structure of Atom-PYQ

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Chemistry - Structure of Atom-PYQ

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