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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)
How many orbitals can have the following set of quantum numbers, n = 3, l = 1, m1 = 0 ?
(2)
Electronic configuration of the outer shell of the element Gd with atomic number 64 is
[A]
4f4 5d5 6s1
[B]
4f3 5d5 6s2
[C]
4f5 5d4 6s1
[D]
4f7 5d1 6s2
(3)
Maximum number of electrons in a subshell can be
[A]
4l + 2
[B]
4l – 2
[C]
2n2
[D]
2l + 1
(4)
The orientation of atomic orbitals depends on their
[A]
spin quantum number
[B]
magnetic quantum number
[C]
azimuthal quantum number
[D]
principal quantum number
Answer: magnetic quantum number
(5)
A gas X has Cp and Cv ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms
[A]
1.2 × 1023
[B]
3.01 × 1023
[C]
2.01 × 1023
[D]
6.02 × 1023
(6)
Number of unpaired electrons in N2+
(7)
The excitation energy of a hydrogen atom from its ground state to its third excited state is
[A]
12.75 eV
[B]
0.85 eV
[C]
10.2 eV
[D]
12.1 eV
(8)
3p orbital has _____ radial nodes
[A]
three
[B]
two
[C]
one
[D]
none
(9)
A 0.66 kg ball is moving with a speed of 100 m/s. Find its wavelength
[A]
6.6 × 10-34 m
[B]
6.6 × 10-32 m
[C]
1.0 × 10-32 m
[D]
1.0 × 10-35 m
(10)
If an atom has four unpaired electrons. What is likely to be the total spin of the electron?
[A]
1
[B]
2.5
[C]
2
[D]
4
(11)
The electronic configuration for oxygen is written as 1s2 2s2 2p4. Which rule will this configuration be violating?
[A]
Aufbau’s principle.
[B]
Hund’s rule.
[C]
Pauli’s exclusion principle.
[D]
None of the above.
Answer: None of the above.
(12)
What is the sequence to label the subshells in an atom?
[A]
S, p, d, f, g
[B]
S, p, p, f, d
[C]
S, s, p, p, d, f, g
[D]
S, p, g, d, f
(13)
The isotopes of a neutral atom of an element differ in which of these?
[A]
Physical properties.
[B]
Chemical properties.
[C]
Atomic number.
[D]
Mass number.
(14)
The maximum mass of an atom is concentrated in which of these?
[A]
Nucleus.
[B]
Neutrons.
[C]
Protons.
[D]
Electrons.
(15)
An atom differs from an ion with respect to which of the following?
[A]
Number of protons.
[B]
Nuclear charge.
[C]
Number of electrons.
[D]
Mass number.
Answer: Number of electrons.
(16)
The electronic configuration of atomic number 20 of an atom is which of the following?
[A]
2, 6, 6, 2
[B]
2, 8, 8, 2
[C]
2, 4, 6, 2
[D]
2, 4, 6, 2
(17)
Who proposed the atomic theory?
[A]
John Dalton.
[B]
Robert Millikan.
[C]
J. J. Thomson.
[D]
Neils Bohr.
(18)
What happens to the atomic number during a chemical reaction?
[A]
It increases.
[B]
It changes.
[C]
Remains the same.
[D]
Changes alternatively.
Answer: Remains the same.
(19)
Atoms that have the same mass number and different atomic number are called?
[A]
Isotopes.
[B]
Isotones.
[C]
Isobars.
[D]
Isomers.
(20)
Which of the following determines the chemical properties?
[A]
Number of protons.
[B]
Number of electrons.
[C]
Number of neutrons.
[D]
None of these.
Answer: Number of electrons.
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