Short Type Questions and Answers for class 11 Chemistry Chapter 2 Structure of Atom

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Questions
1 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:10 electrons
2 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:3s, 3p and 3d orbitals all have the same energy
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3 Which of the following statements does not form a part of Bohrs model of hydrogen atom?
A Energy of the electrons in the orbit is quantised
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:The position and velocity of the electrons in the orbit cannot be determined simultaneously
4 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:-1
5 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:n = 3, l = 2, m = 1, s = + 1/2
6 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:3.4 eV
7 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: 9.84 × 105 J mol-1
8 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: 6.63 × 10-31 m
9 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:12 and 5
10 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: Spin quantum number
11 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:Chromium
12 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:K+, Ca2+, Sc3+, Cl–
13 Which of the following element has least number of electrons in its M-shell?
A K
B Mn
C Ni
D Sc

Answer:K
14 The electronic configuration of silver atom in ground state is
A [Kr]3d104s1
B [Xe]4f145d106s1
C [Kr]4d105s1
D [Kr]4d95s2

Answer:[Kr]4d105s1
15 The magnetic quantum number specifies
A Size of orbitals
B Shape of orbitals
C Orientation of orbitals
D Nuclear Stability

Answer: Orientation of orbitals
16 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: 3s, 3p and 3d orbitals all have the same energy
17 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:743 nm
18 or 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: s < p < d < f
19 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:9.84 × 105 J mol-1
20 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: n, α, p, e

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