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

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Questions
1 If both the K and L shells are full, what would be the atomic number of that element?
A 20
B 14
C 10
D 16

Answer:10
2 Nickel has atomic number 28. Choose the correct electronic configuration for Nickel.
A 1s2 2s2 2p4 3s2 3p8 3d10
B 1s2 2s2 2p6 3s2 3p6 3d8 4s2
C 1s2 2s2 2p4 3s2 3p6 4s2
D 1s2 2s2 3s2 3p8 3d10

Answer:1s2 2s2 2p6 3s2 3p6 3d8 4s2
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3 Which of the following determines the atomic number of an atom?
A Number of electrons.
B Number of protons.
C Number of electrons and protons.
D Number of protons and neutrons.

Answer:Number of protons.
4 Which of the following is responsible for the mass of an atom?
A Only protons.
B Only neutrons.
C Neutrons and protons.
D Protons and electrons.

Answer:Neutrons and protons.
5 An atom has mass number 37 and atomic number 17. Find the number of protons.
A 21
B 22
C 17
D 20

Answer:17
6 What is the formula for a mass number of an atom?
A Number of protons + number of electrons.
B Number of neutrons + number of electrons.
C Number of protons + number of neutrons.
D None of these.

Answer:Number of protons + number of neutrons.
7 Who discovered electron?
A Rutherford.
B J. J. Thomson.
C Neils Bohr.
D James Chadwick.

Answer:J. J. Thomson.
8 Which of the following statements about the electron is incorrect?
A It is a constituent of cathode rays
B The mass of an electron is equal to the mass of a neutron.
C It is a basic constituent of all atoms.
D It is a negatively charged particle.

Answer:The mass of an electron is equal to the mass of a neutron.
9 How many angular nodes for 4d orbital?
A 4
B 3
C 2
D 1

Answer:2
10 Total number of orbitals associated with the third shell will be __________.
A 2
B 4
C 9
D 3

Answer:9
11 Two atoms are said to be isobars if
A they have the same atomic number but different mass number.
B they have the same number of electrons but different number of neutrons.
C they have the same number of neutrons but different number of electrons.
D sum of the number of protons and neutrons is same but the number of

Answer:sum of the number of protons and neutrons is same but the number of
12 Which of the following properties of atom could be explained correctly by Thomson Model of atom?
A Overall neutrality of atom.
B Spectra of hydrogen atom.
C Position of electrons, protons and neutrons in atom.
D Stability of atom.

Answer:Overall neutrality of atom.
13 Orbital angular momentum depends on __________.
A l
B n and l
C n and m
D m and s

Answer:l
14 Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
A 1:2
B 1:1
C 1:3
D 3:1

Answer:1:3
15 Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?
A Pauli’s exclusion principle.
B Heisenberg’s uncertainty principle.
C Hund’s rule of maximum multiplicity.
D Aufbau principle.

Answer: Heisenberg’s uncertainty principle.
16 Which of the following statement is not correct about the characteristics of cathode rays?
A They start from the cathode and move towards the anode.
B They travel in straight line in the absence of an external electrical or magnetic field.
C Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
D Characteristics of cathode rays depend upon the nature of gas present

Answer: Characteristics of cathode rays depend upon the nature of gas present
17 Who proposed the atomic theory?
A John Dalton.
B Robert Millikan.
C J. J. Thomson.
D Neils Bohr.

Answer:Robert Millikan.
18 If travelling at same speeds, which of the following matter waves have the shortest wavelength?
A Electron
B Alpha particle (He2+)
C Neutron
D Proton

Answer: Alpha particle (He2+)
19 For the electrons of oxygen atom, which of the following statements is correct?
A Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital.
B An electron in the 2s orbital has the same energy as an electron in the 2p orbital.
C Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital.
D The two electrons present in the 2s orbital have spin quantum numbers mS but of opposite sign.

Answer:The two electrons present in the 2s orbital have spin quantum numbers mS but of opposite sign.
20 The pair of ions having same electronic configuration is __________
A Cr3+, Fe3+
B Fe3+, Mn2+
C Fe3+, Co3+
D Sc3+, Cr3+

Answer:Fe3+, Mn2+

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