MCQs For NCERT Class 11 Chemistry Chapter 2 Structure of Atom

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Please refer to the MCQ Questions for Class 11 Chemistry Chapter 2 Structure of Atom with Answers. The following Structure of Atom Class 11 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Chemistry with Answers for all chapters in your NCERT Class 11 Chemistry book.

Structure of Atom Class 11 MCQ Questions with Answers

See below Structure of Atom Class 11 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. Uncertainty in position of an electron (Mass = 9.1 × 10^–28 g) moving with a velocity of 3 × 10⁴ cm/s accurate upto 0.001% will be (Use h/(4π) in uncertainty expression where h = .626 × 10^–27 erg second)
(a) 5.76 cm
(b) 7.68 cm
(c) 1.93 cm
(d) 3.84 cm 

Question. In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is [Given that Bohr radius, a0 = 52.9 pm]
(a) 211.6 pm
(b) 211.6 p pm
(c) 52.9 p pm
(d) 105.8 pm

Question. 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is
(a) 5f > 6p > 4d > 5p
(b) 5f > 6p > 5p > 4d
(c) 6p > 5f > 5p > 4d
(d) 6p > 5f > 4d > 5p

Question. Orbital having 3 angular nodes and 3 total nodes is
(a) 5p
(b) 3d
(c) 4f
(d) 6d

Question. Which one is the wrong statement?
(a) The uncertainty principle is ΔE × Δt ≥ h /4π
(b) Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.
(c) The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.
(d) de-Broglie’s wavelength is given by λ = h / mv , where m = mass of the particle, v = group velocity of the particle. 

Question. How many electrons can fit in the orbital for which n = 3 and l = 1?
(a) 2
(b) 6
(c) 10
(d) 14 

Question. Which of the following statements do not form a part of Bohr’s model of hydrogen atom?
(a) Energy of the electrons in the orbits are quantized.
(b) The electron in the orbit nearest the nucleus has the lowest energy.
(c) Electrons revolve in different orbits around the nucleus.
(d) The position and velocity of the electrons in the orbit cannot be determined simultaneously

Question. Which of the following pairs of d-orbitals will have electron density along the axes?
(a) dz², dxz
(b) dxz, dyz
(c) dz², dx² – y²
(d) dxy, dx² – y²

Question. Two electrons occupying the same orbital are distinguished by
(a) azimuthal quantum number
(b) spin quantum number
(c) principal quantum number
(d) magnetic quantum number.

Question. Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. Z = 22)
(a) 4s 3s 3p 3d
(b) 3s 3p 3d 4s
(c) 3s 3p 4s 3d
(d) 3s 4s 3p 3d 

Question. The number of d-electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following?
(a) d-electrons in Fe (Z = 26)
(b) p-electrons in Ne (Z = 10)
(c) s-electrons in Mg (Z = 12)
(d) p-electrons in Cl (Z = 17) 

Question. The angular momentum of electron in ‘d’ orbital is equal to
(a) 2√ 3h
(b) 0 h
(c) √6 h
(d) √2 h

Question. What is the maximum number of orbitals that can be identified with the following quantum numbers? n = 3, l = 1, ml = 0
(a) 1
(b) 2
(c) 3
(d) 4 

Question. 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
(a) 4
(b) 2
(c) 10
(d) 6 

Question. The outer electronic configuration of Gd (At. No. 64) is
(a) 4f ⁵5d⁴6s¹
(b) 4f ⁷5d¹6s²
(c) 4f ³5d⁵6s²
(d) 4f ⁴5d⁵6s¹

Question. The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is
(a) 5, 1, 1, +1/2
(b) 6, 0, 0, +1/2
(c) 5, 0, 0, +1/2
(d) 5, 1, 0, +1/2

Question. The orbital angular momentum of a p-electron is given as
(a) h/ √2 π
(b) √3h/2 π
(c) √3/2 h/ π
(d)√6 h /2π

Question. The total number of atomic orbitals in fourth energy level of an atom is
(a) 8
(b) 16
(c) 32
(d) 4 

Question. If n = 6, the correct sequence for filling of electrons will be
(a) ns → (n – 2)f → (n – 1)d → np
(b) ns → (n – 1)d → (n – 2)f → np
(c) ns → (n – 2)f → np → (n – 1)d
(d) ns → np → (n – 1)d → (n – 2)f 

Question. Maximum number of electrons in a subshell with l = 3 and n = 4 is
(a) 14
(b) 16
(c) 10
(d) 12 

Question. Maximum number of electrons in a subshell of an atom is determined by the following
(a) 2l + 1
(b) 4l – 2
(c) 2n²
(d) 4l + 2 

Question. Which of the following is not permissible arrangement of electrons in an atom?
(a) n = 5, l = 3, m = 0, s = +1/2
(b) n = 3, l = 2, m = –3, s = –1/2
(c) n = 3, l = 2, m = –2, s = –1/2
(d) n = 4, l = 0, m = 0, s = –1/2

Question. The following quantum numbers are possible for how many orbitals? n = 3, l = 2, m = +2
(a) 1
(b) 2
(c) 3
(d) 4 

Question. For which of the following sets of four quantum numbers, an electron will have the highest energy?
n l m s
(a) 3 2 1 +1/2
(b) 4 2 –1 +1/2
(c) 4 1 0 –1/2
(d) 5 0 0 –1/2 

Question. Electronic configuration of calcium atom can be written as
(a) [Ne]4p²
(b) [Ar]4s²
(c) [Ne]4s²
(d) [Kr]4p² 

Question. In a given atom no two electrons can have the same values for all the four quantum numbers. This is called
(a) Hund’s Rule
(b) Aufbau principle
(c) Uncertainty principle
(d) Pauli’s Exclusion principle.

Question. The orientation of an atomic orbital is governed by
(a) principal quantum number
(b) azimuthal quantum number
(c) spin quantum number
(d) magnetic quantum number.

Question. For azimuthal quantum number l = 3, the maximum number of electrons will be
(a) 2
(b) 6
(c) 0
(d) 14 

Question. The order of filling of electrons in the orbitals of an atom will be
(a) 3d, 4s, 4p, 4d, 5s
(b) 4s, 3d, 4p, 5s, 4d
(c) 5s, 4p, 3d, 4d, 5s
(d) 3d, 4p, 4s, 4d, 5s

Question. The electronic configuration of Cu (atomic number 29) is
(a) 1s² 2s²2p⁶ 3s²3p⁶ 4s²3d⁹
(b) 1s² 2s²2p⁶ 3s²3p⁶3d¹⁰ 4s¹
(c) 1s² 2s²2p⁶ 3s²3p⁶ 4s²4p⁶ 5s²5p¹
(d) 1s² 2s²2p⁶ 3s²3p⁶ 4s²4p⁶3d³

Structure of Atom Class 11 MCQ with Answers will assist the student with understanding the chapter in a great way. Besides, these MCQs will fill in as the best revision materials during the class 11 board exam. Aside from Structure of Atom Class 11 MCQ, we have also provided Structure of Atom Notes to assist students with ably planning for the board exam.

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