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MCQ on Atomic Structure Class 11 for NEET Students
In an atom, the order of filling up of the orbitals is governed by
(a) Aufbau’s principle
(b) Heisenberg’s uncertainty principle
(c) Hund’s rule
(d) Pauli’s exclusion principle
Option a – Aufbau’s principle
A radioactive substance has a half-life of four months. Three-fourths of the substance would decay in ( Atomic Structure Class 11 MCQ )
(a) 3 months
(b) 4 months
(c) 8 months
(d) 12 months
Option c – 8 months
Which one of the following is NOT radioactive?
(a) Astatine
(b) Francium
(c) Tritium
(d) Zirconium
Option d – Zirconium
Regarding the atom of a chemical element, the magnetic quantum number refers to ( Atomic Structure Class 11 MCQ )
(a) orientation
(b) shape
(c) size
(d) spin
Option a – orientation
Which one of the following statements is correct?
(a) Liquid sodium is employed as a coolant in nuclear reactors.
(b) Calcium carbonate is an ingredient of toothpaste.
(c) Bordeaux mixture consists of sodium sulphate and lime.
(d) Zinc amalgams are used as dental fillings.
Option a – Liquid sodium is employed as a coolant in nuclear reactors.
The function of heavy water in a nuclear reactor is to ( Atomic Structure Class 11 MCQ )
(a) slow down the speed of neutrons
(b) increase the speed of neutrons
(c) cool down the reactor
(d) stop the nuclear reaction
Option a – slow down the speed of neutrons
In the gamma decay of a nucleus
(a) the mass number of the nucleus changes whereas its atomic number does not change
(b) the mass number of the nucleus does not change whereas its atomic number changes
(c) both the mass number and the atomic number of the nucleus change
(d) neither the mass number nor the atomic number of the nucleus changes
Option d – neither the mass number nor the atomic number of the nucleus changes
Consider the following statements: 1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction. 2. In a nuclear reactor, the reaction is controlled while in nuclear bombs, the reaction is uncontrolled. 3. In a nuclear reactor, all operating reactors are ‘critical’, while there is no question of ‘criticality’ in the case of a nuclear bomb. 4. Nuclear reactors do not use moderators, while nuclear bombs use them. Which of the above statements about the operational principles of a nuclear reactor and a nuclear bomb is/are correct?
(a) 1 and 3
(b) 2 and 3
(c) 4 only
(d) 1 and 4
Option b – 2 and 3
Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40? ( Atomic Structure Class 11 MCQ )
(a) Element with 20 protons and 18 neutrons
(b) Element with 18 protons and 19 neutrons
(c) Element with 20 protons and 19 neutrons
(d) Element with 18 protons and 22 neutrons
Option d – Element with 18 protons and 22 neutrons
A sample of oxygen contains two isotopes of oxygen with masses 16 u and 18 u respectively. The proportion of these isotopes in the sample is 3: 1. What will be the average atomic mass of oxygen in this sample?
(a) 17.5 u
(b) 17 u
(c) 16 u
(d) 16.5 u
Option d – 16.5 u
In which categories did Marie Curie win her two different Nobel prizes? ( Atomic Structure Class 11 MCQ )
(b) Chemistry and Medicine
(c) Physics and Medicine
(d) Chemistry and Peace
Which of the following statements is/are correct? According to Dalton’s theory A. An atom is the smallest particle of matter B. An atom is the smallest particle of element C. An atom is the smallest indivisible particle of an element that can take part in a chemical change D. An atom is a radioactive emission
(a) A, B, and C
(b) B, C, and D
(c) A, C, and D
(d) A and D
Option a – A, B, and C
What is the number of mole(s) of H₂(g) required to saturate one-mole benzene? ( Atomic Structure Class 11 MCQ )
(a) 1
(b) 2
(c) 3
(d) 4
Option c – 3
How many moles of hydrogen atoms are present in one mole of Aluminium hydroxide?
(a) one mole
(b) Two moles
(c) Three moles
(d) Four moles
Option c – Three moles
Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength? ( Atomic Structure Class 11 MCQ )
(a) n = 2 to n = 1
(b) n = 3 to n = 2
(c) n = 4 to n = 3
(d) n = 5 to n = 4
Option a – n = 2 to n = 1
Most explosions in mines occur due to the mixing of
(a) hydrogen with oxygen
(b) oxygen with acetylene
(c) methane with air
(d) carbon dioxide with ethane
Option c – methane with air
What mass of hydrogen and oxygen will be produced on complete electrolysis of 18g of water? ( Atomic Structure Class 11 MCQ )
(a) 2g hydrogen and 32g oxygen
(b) 2g hydrogen and 16g oxygen
(c) 4g hydrogen and 32g oxygen
(d) 4g hydrogen and 14g oxygen
Option b – 2g hydrogen and 16g oxygen
A body is charged negatively. It implies that
(a) it has lost some of its protons
(b) it has acquired some electrons from outside
(c) it has lost some of its electrons
(d) None of the above
Option b – it has acquired some electrons from outside
Which one of the following reactions is the main cause of the energy radiation from the Sun? ( Atomic Structure Class 11 MCQ )
(a) Fusion reaction
(b) Fission reaction
(c) Chemical reaction
(d) Diffusion reaction
Option a – Fusion reaction
In an atomic explosion, the release of a large amount of energy is due to the conversion of
(a) chemical energy into nuclear energy
(b) nuclear energy into heat
Option a – chemical energy into nuclear energy
In Tritium (T), the number of protons (P) and neutrons (N) respectively are ( Atomic Structure Class 11 MCQ )
(a) 1 P and 1 N
(b) IP and 2 N
(c) 1 Pand 3 N
(d) 2 P and 1 N
Option b – IP and 2 N
The atomic theory of matter was first proposed by
(a) John Dalton
(b) Rutherford
(c) J. J. Thomson
(d) Niels Bohr
Option a – John Dalton
Radioactivity was discovered by ( Atomic Structure Class 11 MCQ )
(A) Rutherford
(B) Becquerel
(C) Bohr
(D) Madam Curie
Option b – Becquerel
Isotopes are those atoms of the same element which have
(A) Atomic mass is the same but the atomic number is different
(B) Atomic mass is different but atomic number is the same
(C) Atomic number and atoms mass both are the same
(D) None of the above
Option b – Atomic mass is different but atomic number is the same
Isotopes are nuclei of the atomic nucleus in which ( Atomic Structure Class 11 MCQ )
(A) Number of neutrons is the same but the number of protons is different
(B) Number of protons is the same but the number of neutrons is different
(C) Number of both protons and neutrons is the same
(D) Number of both protons and neutrons is different
Option b – Number of protons is the same but the number of neutrons is different
Radioactivity is measured by
(A) Hydrometer
(B) Geiger Counter
(C) Seismometer
(D) Ammeter
Option b – Geiger Counter
Which of the following carries a negative charge? ( Atomic Structure Class 11 MCQ )
(A) X-rays
(B) Alpha particles
(C) Beta particles
(D) Gamma rays
Option c – Beta particles
In an atom, the order of filling up of the orbitals is governed by
(A) Aufbau’s principle
(B) Heisenberg’s uncertainty principle
(C) Hund’s rule
(D) Pauli’s exclusion principle
Option a – Aufbau’s principle
Regarding the atom of a chemical element, the magnetic quantum number refers to
(A) Orientation
(B) Shape
(C) Size
(D) Spin
Option a – Orientation
What is the mass number of an element, the atom of which contains two protons, two neutrons, and two electrons?
(A) 2
(B) 4
(C) 6
(D) 8
Option b – 4
The atoms, in which the number of protons is the same but the number of neutrons is different, are known as
(A) Isobars
(B) Isomers
(C) Isotones
(D) Isotopes
Option d – Isotopes
A radioactive substance emits
(a) alpha particle
(b) beta particle
(c) gamma particle
(d) all of the three
Option d – all of the three
‘Yellow Cake’ an item of smuggling across the border is
(a) a crude form of heroin
(b) a crude form of cocaine
(c) uranium oxide
(d) unreformed gold
Option c – uranium oxide
A radioactive substance has a half-life of four months. Three-fourths of the substance would decay in
(a) 3 months
(b) 4 months
(c) 8 months
(d) 12 months
Option c – 8 months
The difference between a nuclear reactor and an atomic bomb is that
(a) no chain reaction takes place in a nuclear reactor while in the atomic bomb there is a chain reaction.
(b) the chain reaction in a nuclear reactor is controlled.
(c) the chain reaction in nuclear reactors is not controlled.
(d) no chain reaction takes place in an atomic bomb while it takes place in a nuclear reactor.
Option b – the chain reaction in a nuclear reactor is controlled
The inexhaustible source of energy of the stars is due to
(a) conversion of hydrogen to helium
(b) conversion of helium to hydrogen
(c) decay of radioactive elements
(d) excess of oxygen that helps burn and release energy
Option a – conversion of hydrogen to helium
The credit for the construction of the first nuclear reactor goes to
(a) Niels Bohr
(b) Fermi
(c) Einstein
(d) Oppenheimer
Option b – Fermi
Which of the following is likely to reach our body via the food chain in the event of an atomic bomb explosion?
(a) U-235
(b) Sr-90
(c) K-40
(d) H-3
Option b – Sr-90
“Radioactive dating” is a technique that can be used to measure
(a) the age of rocks
(b) the composition of rocks
(c) color of rocks
(d) the weight of rocks
Option a – the age of rocks
A hydrogen bomb is based on the principle of
(a) controlled fusion reaction
(b) uncontrolled fusion reaction
(c) controlled fission reaction
(d) uncontrolled fission reaction
Option b – uncontrolled fusion reaction
Consider the following statements about nuclear fusion reactors: 1. They work on the principle of fission of heavy nuclei. 2. They usually have Tokamak designs. 3. They operate at very high temperatures. Of these
(a) Only 1 and 3 are correct
(b) Only 1 and 2 are correct
(c) Only 2 and 3 are correct
(d) All three 1, 2, and 3 are correct
Option c – Only 2 and 3 are correct
Carbon or Graphite rods are used in atomic reactors as moderators for sustained nuclear chain reactions through the nuclear fission process. In this process
(a) the neutrons are made fast
(b) the protons are made fast
(c) the neutrons are made slow
(d) the protons are made slow
Option c – the neutrons are made slow
The number of molecules of water of crystallization in copper sulphate, sodium carbonate, and Gypsum is
(a) 5, 10, and 2 respectively
(b) 10, 2, and 5 respectively
(c) 5, 2, and 10 respectively
(d) 2, 5, and 10 respectively
Option a – 5, 10, and 2 respectively
The proposition ‘equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure is known as
(a) Avogadro’s hypothesis
(b) Gay-Lussac’s hypothesis
(c) Planck’s hypothesis
(d) Kirchhoff’s theory
Option a – Avogadro’s hypothesis
Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the synthetic elements in both the natural calcium carbonate are the same. Validity of which one among the following laws are confirmed by this observation?
(a) Law of conservation of mass
(b) Law of definite proportion
(c) Law of multiple proportions
(d) Avogadro’s law
Option b – Law of definite proportion
Which statement is not associated with nuclear fission?
(a) Neutron-induced nuclear reaction
(b) Energy generation in stars
(c) Source of energy in a nuclear reactor that produces electricity
(d) Enormous energy is released in an atom bomb
Option b – Energy generation in stars
Which one of the following statements is not correct?
(a) Hydrogen is an element
(b) Hydrogen is the lightest element
(c) Hydrogen has no isotopes
(d) Hydrogen and oxygen form an explosive mixture
Option c – Hydrogen has no isotopes
‘Plum Pudding Model’ for an atom was proposed by
(a) Antoine Lavoisier
(b) Robert Boyle
(c) Ernest Rutherford
(d) J. J. Thomson
Option d – J. J. Thomson
What is the number of atoms in 46 g of sodium-23 [N = Avogadro constant)?
(a) N/2
(b) N
(c) 2N
(d) 23N
Option c – 2N
How many hydrogen atoms are contained in 1.50 g of glucose (C6H1206)?
(a) 3.01 x 1022
(b) 1.20 x 1023
(c) 2.40 x 1023
(d) 6.02 x 1022
Option d – 6.02 x 1022
How many moles of the hydrogen atom are present in one mole of Aluminium hydroxide?
(a) one mole
(b) Two moles
(c) Three moles
(d) Four moles
Option c – Three moles
An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?
(a) 12
(b) 6
(c) 10
(d) 14
Option b – 6
Which of the following are the properties of an electron? 1. Electron is a constituent of cathode ray 2. An electron is a negatively charged particle 3. The mass of the electron is equal to the mass of the proton 4. Electron is deflected by the electric field but not by the magnetic field Select the correct answer using the code given below :
(a) 1 and 2 only
(b) 1, 2 and 3
(c) 3 and 4
(d) 1 and 4
Option a – 1 and 2 only
Which one of the following statements is correct?
(a) Rutherford’s alpha-particle scattering experiment led to the discovery of the electron
(b) J J Thomson suggested that the nucleus of an atom contains protons
(c) The atomic number of an element is the same as the number of protons in the nucleus of its atom
(d) The mass number of an atom is equal to the number of electrons in its shells
Option c – The atomic number of an element is the same as the number of protons in the nucleus of its atom
Assertion (A): Aluminium foil cannot be used in a particle scattering experiment. Reason (R): Aluminium is a highly malleable metal.
(a) Both A and R are correct. R is the correct reason for A.
(b) Both A and R are correct but R is not the correct reason for A.
(c) A is correct and R is incorrect.
(d) A is incorrect and R is correct.
Option d – A is incorrect and R is correct
Which one of the following nitrogen oxides has the highest oxidation state of nitrogen?
(a) NO
(b) NO₂
(c) N₂O
(d) N₂O5
Option d – N₂O5
An electron and a proton starting from rest get accelerated through a potential difference of 100 kV. The final speeds of the electron and the proton are Ve and Vp respectively. Р Which one of the following relations is correct?
(a) Ve > Vp
(b) V₂ <Vp
(c) Ve – Vp
(d) Cannot be determined
Option a – Ve > Vp
The valency of an element depends upon the
(a) total number of protons in an atom
(b) the mass number of an atom
(c) the total number of neutrons in an atom
(d) the total number of electrons in the outermost shell of the atom
Option d – the total number of electrons in the outermost shell of the atom
The number of maximum electrons in N Shell is
(a) 2
(b) 8
(c) 18
(d) 32
Option d – 32
Arrange the following substances in chronological order of their first synthesis in the lab: 1. Black gold 2. Fullerene 3. Graphene 4. Kevlar Select the correct answer from the codes given below: Codes :
(a) 1 2 3 4
(b) 4 2 3 1
(c) 2 4 3 1
(d) 4 1 2 3
Option b – 4 2 3 1
Consider the following statements (a) A molecule of sulphur contains 4 sulphur atoms. (b) Metals placed below hydrogen in activity series lose electrons to H+ ions of acids. (c) Silver acquires a blackish tinge when exposed to air for a long time. Which of these statement(s) is/are correct?
(a) (a) and (b)
(b) (a) and (c)
(c) (b) and (c)
(d) Only (c)
Option d – Only (c)
The atoms, in which the number of protons is but same the number of neutrons is different, are known as
(a) Isotopes
(b) Isobars
(c) Isomers
(d) Isotones
Option a – Isotopes
The atomic nucleus was discovered by
(a) Rutherford
(b) Dalton
(c) Einstein
(d) Thompson
Option a – Rutherford
Which one of the following statements is not correct?
(a) Atoms of different elements may have the same mass numbers
(b) Atoms of an element may have different mass numbers
(c) All the atoms of an element have the same number of protons
(d) All the atoms of an element will always have the same number of neutrons.
Option d – All the atoms of an element will always have the same number of neutrons
The atomic theory of matter was first proposed by
(a) John Dalton
(b) Rutherford
(c) J. J. Thomson
(d) Niels Bohr
Option a – John Dalton
There are six electrons, six protons, and six neutrons in the atom of an element. What is the atomic number of the element?
(a) 6
(b) 12
(c) 18
(d) 24
Option a – 6
Which one of the following has a different number of molecules? (All are kept at normal temperature and pressure)
(a) 3 grams of Hydrogen
(b) 48 grams of Oxygen
(c) 42 grams of Nitrogen
(d) 2 grams of Carbon
Option b – 48 grams of Oxygen
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