Atomic Structure IIT JEE Questions and Answers

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Atomic Structure Mock Test for Students

Isotopes of an element have ………..

(a) same physical properties

(b) different chemical properties

(c) different numbers of neutrons

(d) different atomic number

Option c – different numbers of neutrons

Isobars have ……….

(a) same mass numbers but different atomic numbers.

(b) different mass numbers but the same atomic numbers.

(c) same mass and atomic numbers

(d) different mass and atomic numbers.

Option a – same mass numbers but different atomic numbers

The mass number is always equal to ……….

(a) a number of protons.

(b) number of neutrons

(c) sum of the number of protons and number of electrons

(d) sum of the number of protons and number of neutrons

Option d – sum of the number of protons and number of neutrons

Which one among the following is the most appropriate statement with respect to the atomic weight of an element?

(a) The atomic weight of an element is the sum total of the number of protons and neutrons present in the atom of an element.

(b) Unlike mass numbers, the atomic weight of an element can be a fraction.

(c) The atomic weight of an element is a whole number.

(d) The atomic weight of all the atoms in an element is the same.

Option b – Unlike mass numbers, the atomic weight of an element can be a fraction

The atoms of the elements having the same difference between mass number and atomic number are called ……….

(a) Isobar

(b) Isotopes

(c) Isotones

(d) No option is correct

Option c – Isotones

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

The chemical properties of isotope

(a) must be the same.

(b) must be different.

(c) need not be the same.

(d) need not be different.

Option a – must be the same

Most of the mass of the atom can be found in

(a) electrons

(b) charges

(c) nucleus

(d) electron cloud

Option c – nucleus

The atomic mass of an element is equal to the sum of a number of

(a) electrons and protons only.

(b) protons and neutrons only.

(c) electrons and neutrons only.

(d) electrons, protons and neutrons.

Option b – protons and neutrons only

An atom of carbon has 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

Who developed the model of atomic structure?

(a) Bohr and Rutherford

(b) Volta

(c) Alfred Nobel

(d) Faraday

Option a – Bohr and Rutherford

Which one of the following statements is correct?

(a) Rutherford’s alpha particle. scattering experiment led to the discovery of electrons.

(b) JJ 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

Consider the following statements. I. JJ Thomson was the first one to propose a model for the structure of an atom. II. Rutherford designed an experiment for the arrangement of electrons within an atom. In this experiment, fast-moving alpha particles were made to fall on a thin gold foil. Which of the statement(s) given above is/are correct?

(a) Only I

(b) Only II

(c) I and II

(d) None of these

Option c – I and II

Consider the following statements I. An atom consists of a positively charged sphere and the electrons are embedded in it. II. The negative and positive charges are equal in magnitude. So, the atom as a whole is electrically neutral. Which of the statements given above is/are correct about Thomson’s model of an atom?

(a) Only I

(b) Only II

(c) Both I and II

(d) None of these

Option c – Both I and II

Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?

(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

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

Option b – Heisenberg’s uncertainty principle

Atomic Number is denoted by which alphabet?

(a) A

(b) N

(c) Z

(d) E

Option c – Z

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