MCQ Structure Of Atom Chapter 2 Class 11 Chemistry

MCQ’s For All Chapters – Chemistry Class 11th

1. Which one of the following statements applies to atoms which are isotopes of the same element?

The number of electrons outside the nucleus is the same.

The mass numbers are the same.

The sum of the number of electrons and neutrons is the same.

The sum of the number of protons and neutrons is the same.

Your comments:

Question 1 of 20

2. An atom of the most common isotope of platinum,

has the following combination of protons, neutrons, and electrons.

78, 116, 78

194, 78, 78

78, 116, 78

78, 194, 78

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Question 2 of 20

3. The nucleus of an atom of

contains:

8 protons and 18 electrons

8 protons and 18 neutrons

8 protons and 10 neutrons

10 protons and 8 neutrons

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Question 3 of 20

4. The atoms of different isotopes of same element differ from each other in the number of

Protons

Neutrons

Electrons in the inner shell only

Electrons in outer most shell only

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Question 4 of 20

5. Which statement is correct?

protons, neutrons and electrons together uniformly occupy the total volume of the atom

Neutrons and protons together have the least mass

Electrons occupy most of the space and contributes very little to the mass of the atom.

Electrons and protons have most of the mass and occupy very little space.

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Question 5 of 20

6. The radius of the nucleus of an atom is approximately:

10^-15 m

1 nm

10^-10 m

10^-12 m

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Question 6 of 20

contains

12 neutrons

22 nucleons

22 protons

22 neutrons

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Question 7 of 20

differ from each in respect of ?

electrons

protons

neutrons

None of these

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Question 8 of 20

9. Thomson's plum pudding model explained:

Existence of protons

Electrical neutrality of an atom

Existence of electrons

Electrons move in fixed circular orbits

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Question 9 of 20

10. In which pair is the two species Isoelectronic?

As, P

O, F

Fe²⁺, Fe³⁺

O, N-

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Question 10 of 20

11. Which pair of species has the same number of electrons?

Fe, Mn⁺

Ar, K⁺

Te, Se

Mn, Tc

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Question 11 of 20

12. The smallest particle of an element which can take part in chemical reactions and may or may not exist independently is the

Nucleus

Compound

Atom

Neutron

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Question 12 of 20

13. The charge on electron was determined by

Crooks

Bohr

Milliken

Schrodinger

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Question 13 of 20

14. The ratio of e/m for cathode rays

Varies with gas in discharge tube

Is maximum when hydrogen is taken

Is fixed

Varies with different electrode

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Question 14 of 20

15. The three fundamental particles of the atom are

Mesons, Quarks and Anti-neutrino

Positron, Neutrino and Gamma Rays

Nucleus, Anti-quarks and Electrons

Proton, Neutron and Electron

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Question 15 of 20

16. A subshell with n = 6,

= 2 can accomodate a maximum of

10 electrons

72 electrons

12 electrons

36 electrons

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Question 16 of 20

17. The triad of nuclei that is isotonic is:

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Question 17 of 20

18. The radius of an atom is approximately :

10^-12 cm

1 nm

1cm

10^-10 m

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Question 18 of 20

19. The nucleus of a tritium atom, ³H, contains

three protons

three neutrons

two protons and one neutron

two neutrons and one proton

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Question 19 of 20

20. Which of the following is true about electron:

It is negatively charged and is lighter than a proton.

It is negatively charged and has same mass as a proton.

It is positively charged and has no mass

None of the above

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Question 20 of 20