CBSE MCQ Questions for Class 11 Chemistry Chapter 2 Structure of Atom with Answers Pdf free download. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. This MCQ will help you score good marks in the final exam. Waves Class 11 Chemistry MCQs are prepared for a better understanding of the concept. Structure of Atom Class 11 Chemistry MCQ is prepared by Experts of CBSE.
Class 11 Chemistry Chapter 2 Structure of Atom MCQs
Check the multiple-choice questions for the 11th Class Chemistry Chapter 2 Structure of Atom. Select one answer out of 4 options.
Structure of Atom Class 11 MCQs Questions with Answers
For a given principal level n = 4, the energy of its subshells is in the order
(a) s < p < d < f
(b) s > p > d > f
(c) s < p < f < d
(d) f < p < d < s
Answer: (a) s < p < d < f
Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos.: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)
(a) K+, Ca2+, Sc3+, Cl–
(b) Na+, Ca2+ , Sc3+, F–
(c) K+, Cl–, Mg2+, Sc3+
(d) Na+, Mg2+, Al3+, Cl–
Answer: (a) K+, Ca2+, Sc3+, Cl–
The electrons of the same orbitals can be distinguished by
(a) Principal quantum number
(b) Azimuthal quantum number
(c) Spin quantum number
(d) Magnetic quantum number
Answer: (c) Spin quantum number
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
Answer: (d) 9.84 × 105 J mol-1
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
Answer: (d) The position and velocity of the electrons in the orbit cannot be determined simultaneously
The electronic configuration of silver atom in ground state is
(a) [Kr]3d104s1
(b) [Xe]4f145d106s1
(c) [Kr]4d105s1
(d) [Kr]4d95s2
Answer: (c) [Kr]4d105s1
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) 518 nm
(b) 1035 nm
(c) 325 nm
(d) 743 nm
Answer: (d) 743 nm
The ionisation potential of a hydrogen atom is –13.6 eV. What will be the energy of the atom corresponding to n = 2.
(a) – 3.4 eV
(b) – 6.8 eV
(c) – 1.7 eV
(d) –2.7 eV
Answer: (a) – 3.4 eV
The increasing order (lowest first) for the values of e/m (charge/mass) for
(a) e, p, n, α
(b) n, p, e, α
(c) n, p, α, e
(d) n, α, p, e
Answer: (d) n, α, p, e
In which of the following Bohr’s stationary state, the electron will be at maximum distance from the nucleus ?
(a) II nd
(b) I st
(c) V th
(d) III rd
Answer: (c) V th
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
Answer: (d) 9.84 × 105 J mol-1
What will be the sum of all possible values of l and m for n = 5 ?
(a) 12
(b) 13
(c) 4
(d) 9
Answer: (b) 13
The number of spherical nodes in 3p orbitals are
(a) one
(b) three
(c) two
(d) None of these
Answer: (a) one
In the Bohrs model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is:
(a) 1
(b) 2
(c) -1
(d) -2
Answer: (c) -1
A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10-34 Js)
(a) 6.63 × 10-37 m
(b) 6.63 × 10-31 m
(c) 6.63 × 10-34 m
(d) 6.63 × 10-35 m
Answer: (b) 6.63 × 10-31 m
In Hydrogen atom, energy of first excited state is – 3.4 eV. Then find out KE of same orbit of Hydrogen atom
(a) 3.4 eV
(b) 6.8 eV
(c) -13.6 eV
(d) +13.6 eV
Answer: (a) 3.4 eV
In the ground state, an element has 13 electrons in its M-shell. The element is
(a) Copper
(b) Chromium
(c) Nickel
(d) Iron
Answer: (b) Chromium
Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively
(a) 12 and 4
(b) 12 and 5
(c) 16 and 4
(d) 16 and 5
Answer: (b) 12 and 5
Which of the following statements in relation to the hydrogen atom is correct?
(a) 3s orbital is lower in energy than 3p orbital
(b) 3p orbital is lower in energy than 3d orbital
(c) 3s and 3p orbitals are of lower energy than 3d orbital
(d) 3s, 3p and 3d orbitals all have the same energy
Answer: (d) 3s, 3p and 3d orbitals all have the same energy
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
Answer: (c) n = 3, l = 2, m = 1, s = +1/2
Rutherford’s experiment which established the nuclear model of the atom used a beam of
(a) β-particles which impinged on a metal foil and got absorbed
(b) γ-rays, which impinged on a metal foil and got absorbed
(c) helium atoms which impinged on a metal foil and got reflected
(d) helium nuclei which impinged on a metal foil and got scattered
Answer: (d) helium nuclei which impinged on a metal foil and got scattered
The magnetic quantum number specifies
(a) Size of orbitals
(b) Shape of orbitals
(c) Orientation of orbitals
(d) Nuclear Stability
Answer: (c) Orientation of orbitals
The number of nodal planes in px orbital is
(a) one
(b) two
(c) three
(d) zero
Answer: (a) one
How many moles of electrons weigh one kilogram?
(a) 6.022 × 1023
(b) 1/9.108 × 1031
(c) 6022/9.108 × 1054
(d) 1/(9.108×6.022) × 108
Answer: (d) 1/(9.108×6.022) × 108
A sub-shell with n = 6 , l = 2 can accommodate a maximum of
(a) 12 electrons
(b) 36 electrons
(c) 10 electrons
(d) 72 electrons
Answer: (c) 10 electrons
The electronic configuration of an element is 1s² 2s² 2p6 3s² 3p6 3d5 4s1. It represents
(a) excited state
(b) cationic states
(c) ground state
(d) anionic state
Answer: (c) ground state
The electronic configuration of Cu2+ ion is
(a) [Ar] 4s1 3d8
(b) [Ar] 4s² 3d10 4p1
(c) [Ar] 4s1 3d10
(d) [Ar] 3d9
Answer: (d) [Ar] 3d9
The quantum numbers + 1/2 and – 1/2 for the electron spin represent
(a) rotation of the electron in clockwise and anticlockwise direction respectively
(b) rotation of the electron in anticlockwise and clockwise direction respectively
(c) magnetic moment of the electron pointing up and down respectively
(d) two quantum mechanical spin states which have no classified analogue
Answer: (d) two quantum mechanical spin states which have no classified analogue
What is the wavelength of light. Given energy = 2.91 × 10-19], h = 6.36 × 10-34 Js, c = 3.0 × 108 m/s?
(a) 6.56 nm
(b) 656 nm
(c) 0.656 nm
(d) 65.6 nm
Answer: (b) 656 nm
If the nitrogen atom had electronic configuration 1s², it would have energy lower than that of the normal ground state configuration 1s² 2s² 2p³, because the electrons would be closer to the nucleus. Yet, 1s² is not observed because it isolates.
(a) Heisenberg’s Uncertainty Principle
(b) Hund’s rule
(c) Pauli Exclusion Principle
(d) Bohr postulate of stationary orbits
Answer: (c) Pauli Exclusion Principle
The total number of orbitals in a shell having principal quantum n is
(a) 2n
(b) n²
(c) 2n²
(d) (n + 1)
Answer: (a) 2n
Which is not true with respect to cathode rays?
(a) Move with speed same as that of light
(b) Can be deflected by magnetic fields
(c) Charged particles
(d) A stream of electrons
Answer: (a) Move with speed same as that of light
Which of the following statements about the electron is incorrect?
(a) The mass of electron is equal to the mass of neutron
(b) It is a basic constituent of all atoms.
(c) It is a constituent of cathode rays.
(d) It is negatively charged particle
Answer: (a) The mass of electron is equal to the mass of neutron
In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is
(a) 1.51 eV
(b) 3.4 eV
(c) 6.04 eV
(d) 13.6 eV
Answer: (a) 1.51 eV
Which of the following is never true for cathode rays ?
(a) They are electromagnetic waves
(b) They produce heat
(c) They produce mechanical pressure
(d) They possess kinetic energy
Answer: (a) They are electromagnetic waves
In discharge tube experiment stream of negatively charged particles travel from
(a) cathode to anode
(b) Electrons does not travel
(c) anode to cathode
(d) None of these
Answer: (a) cathode to anode
According to Aufbaus principle, which of the three 4d, 5p and 5s will be filled with electrons first
(a) 4d
(b) 5p
(c) 5s
(d) 4d and 5s will be filled simultaneously
Answer: (c) 5s
Which of the following element has least number of electrons in its M-shell?
(a) K
(b) Mn
(c) Ni
(d) Sc
Answer: (a) K
The credit of discovering neutron goes to
(a) Rutherford
(b) Thomson
(c) Goldstein
(d) Chadwick
Answer: (d) Chadwick