Atomic Structure Multiple Choice Questions

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Atomic Structure MCQs For Class 11

Question 1. Which energy level would allow the hydrogen atom to absorb a photon but not to emit a photon?

  1. 2s
  2. 2p
  3. 1s
  4. 3d

Answer: 3. 1s

Question 2. The value of the azimuthal quantum number for all the electrons present in 4d orbitals is

  1. 2
  2. 3
  3. 4
  4. 1

Answer: 1. 2

Question 3. Which of the following transitions in the hydrogen atom would require the largest amount of energy?

  1. From n =1 to n = 2
  2. From n =∞  to n = 1
  3. From n = 2 to n = 3
  4. From n = 3 to n = 5

Answer: 1. From n =1 to n = 2

“Multiple choice questions on atomic structure with answers”

Question 4. The maximum number of 3d electrons with the spin quantum number -1/2 is

  1. 5
  2. 7
  3. 10
  4. 1

Answer: 1. 5

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Question 5. The number of electrons present in -1/2 is

  1. 12
  2. 17
  3. 7
  4. 10

Answer: 4. 10

Question 6. Which of the following configurations is not possible?

  1. 3p6
  2. 2s1
  3. 3f7
  4. 4d5

Answer: 3. 3f7

Question 7. The number of unpaired electrons in Fe3+ (Z = 26) is

  1. 2
  2. 3
  3. 4
  4. 5

Answer: 4. 5

“Basic atomic structure MCQs for beginners”

Question 8. Which of the following radiations is associated with the highest energy?

  1. λ =  300 pm
  2. λ = 30 nm
  3. v = 3 x 102 s-1
  4. v = 3 x 1010 s-1

Answer: 1.  λ =  300 pm

WBCHSE For Class11 Multiple Choice Questions Atomic Structure

Question 9. Krypton (36Kr) has the electronic configuration [Ar] 4s2 3d10 4p6. The 37th electron will go into which of the following subshells?

  1. 4f
  2. 4d
  3. 3p
  4. 5s

Answer: 4. 5s

Question 10. The set of quantum numbers not applicable to an electron in an atom is

  1. n = 1, l = 1, m = 1, s = +1/2
  2. n = 1, l = 0, m = 0, s = -1/2
  3. n = 1, l = 0, m = 0, s = +1/2
  4. n = 2, l = 0, m = 0, s = 1/2

Answer: 1. n = 1, l = 1, m = 1, s = +1/2

“Advanced atomic structure MCQs with solutions”

Question 11. Which of the following represents a noble gas configuration?

  1. \(1 s^2 2 s^2 2 p^6 3 s^2\)
  2. \(1 s^2 2 s^2 2 p^6 3 s^1\)
  3. \(1 s^2 2 s^2 2 p^6\)
  4. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2\)

Answer: 3. \(1 s^2 2 s^2 2 p^6\)

Electron Configuration and Atomic Theories MCQs

Question 12. The maximum wavelength of light that can excite an electron from the energy level n = 1 to the level n = 3 in atomic hydrogen is

  1. 1 nm
  2. 102 nm
  3. 487 nm
  4. 10-7 nm

Answer: 2. 102 nm

Question 13. The wave number of the first line in the Balmer series of hydrogen is 15,200 cm-1. What would be the wave number of the first line in the Balmer series of the Be3+ ion?

  1. 2.4 x 105 cm-1
  2. 24.3 x 105 cm-1
  3. 6.08 x 105 cm-1
  4. 24.3 x 104 cm-1

Answer: 1. 2.4 x 105 cm-1, 4. 24.3 x 104 cm-1

“Atomic number and mass number MCQs with explanation”

Question 14. The electronic configuration of an element is 1s2 2s2 2p4. The number of impaired electrons is

  1. 1
  2. 2
  3. 3
  4. 4

Answer: 2. 2

Question 15. Which is the correct electronic configuration of Sc (Z = 21)?

  1. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^1\)
  2. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^3\)
  3. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^1 3 d^2\)
  4. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 3 d^5 4 s^1\)

Answer: 1. \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^1\)

Question 16. The total number of electrons in a 2p orbital is

  1. 3
  2. 6
  3. 4
  4. 8

Answer: 2. 6

Question 17. Which of these has the configuration of a hydrogen atom?

  1. He–
  2. He2+
  3. Li+
  4. Li2+

Answer: 4. Li+

“Isotopes and isobars multiple choice questions PDF”

Question 18. If the radius of the first Bohr orbit is a0, then the radius of the third Bohr orbit will be

  1. 3a0
  2. 1/3 a0
  3. 9a0
  4. 1/3a0

Answer: 3. 9a0

Atomic Structure Multiple Choice

Question 19. The spectrum of He will be similar to that of

  1. H
  2. Li
  3. Li2+
  4. Li+

Answer: 4. Li+

Question 20. The maximum number of electrons in an orbit of n = 4, l= 3 is

  1. 2
  2. 4
  3. 10
  4. 6

Answer: 3. 10

“Electron configuration MCQs for competitive exams”

Question 21. Which of these has maximum number of unpaired electrons?

  1. Mn2+
  2. Fe
  3. Cu+
  4. Zn

Answer: 1. Mn2+

Question 22. In which orbital diagram (given below) is both Pauli exclusion principle and Hund rule violated?

Answer: 2

Question 23. The ratio of the energy of a photon of λ = 100 pm to that of one of λ =  200 pm is

  1. 2
  2. 1/2
  3. 4
  4. 1/4

Answer: 1. 2

“Quantum numbers MCQs with detailed answers”

Question 24. The correct set of quantum numbers for the unpaired electron in a sodium atom is

  1. n = 3, 1 = 0, ml = 0, ms = +1/2
  2. n = 3, l = 1, ml = 0, ms = -1/2
  3. n = 2, l = 0, ml = 0, ms = -1/2
  4. n = 3, l=0, ml = 1, ms = -1/2

Answer: 1. n = 3, 1 = 0, ml = 0, ms = +1/2

Question 25. The energy of the first excited state of the hydrogen atom is -3.2 eV. The kinetic energy of the same orbit will be

  1. -6.4eV
  2. +3.2 eV
  3. +1.6 eV
  4. +64 eV

Answer: 2. +3.2 eV

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