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Free download in PDF Class 11 Chemistry Chapter 2 Structure of Atom Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER and other competitive exams. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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
(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
(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
(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
(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
(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
(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
(14)
The electronic configuration of silver atom in ground state is
[A]
[Kr]3d104s1
[B]
[Xe]4f145d106s1
[C]
[Kr]4d105s1
[D]
[Kr]4d95s2
(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
(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
(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
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