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Molecules and Atoms Quiz – Objective Questions and Answers

1. Which of the following is/are correct regarding structural aspects of an atom
  • (A) Protons carry positive charge
  • (B) Electrons carry negative charge
  • (C) Neutrons are electrically neutral
  • (D) All of the above are correct

2. Which of the following sub particles surround the nucleus
  • (A) Protons
  • (B) Neutrons
  • (C) Electrons
  • (D) All of these

3. Which of the following depicts in short hand the structures of the atom of each element
  • (A) Periodic table
  • (B) Sub-shell
  • (C) Energy level
  • (D) Orbitals

4. The number in the upper left hand corner of each element symbol is the
  • (A) Atomic number
  • (B) Mass number
  • (C) Both (A) and (B)
  • (D) None of these

5. Elements can exist in different forms, called isotopes, that have
  • (A) Different numbers of neutrons
  • (B) Different numbers of protons
  • (C) same number of neutrons
  • (D) None of the above

6. which of the following depicts the interactions between atoms
  • (A) Bohr’s model
  • (B) Hund’s rule
  • (C) Planck’s la
  • (D) All of these

7. An orbital is not a physical quantity, but a way of imaging or representing
  • (A) Electron arrangement
  • (B) Proton arrangement
  • (C) Neutron arrangement
  • (D) None of the above

8. Usually the outermost shell is filled with eight electrons, the tendency of an atom to fill its outermost shell is thus called the-
  • (A) Hexane rule
  • (B) Heptane rule
  • (C) Octet rule
  • (D) None rule

9 Groups of electron orbitals form levels of energy called-
  • (A) Energy house
  • (B) Energy shell
  • (D) Entropy
  • (C) Enthalpy

10. Electrons tend to occupy the lowest possible energy shell, ie., the shell-
  • (A) Away from the nucleus
  • (B) Near the outermost orbit
  • (C) Closest to the nucleus
  • (D) Inside the nucleus

11. A substance consisting entirely of atoms of the same atomic number is called
  • (A) Element
  • (B) Bond
  • (C) Shell
  • (D) Orbit

12. Which of the following bonds is formed when hydrogen atoms covalently bonded to one atom are attracted to an atom in another molecule
  • (A) Ionic bond
  • (B) Covalent bond.
  • (C) Hydrogen bond
  • (D) None of these

13. Dynamic attractions between molecules that occur when oppositely charged regions approach one another, are called
  • (A) Covalent bonds
  • (B) Ionic bonds
  • (C) Hydrogen bonds
  • (D) Van der Waals attractions

14. The process of sharing and exchanging electrons creates attachments or-

15. A sodium atom (Nat) and a chlorine atom (CH) combine to form a/an-
  • (A) Ionic bond
  • (B) Element
  • (C) Compound
  • (D) Both (B) and (C)

16. Many macromolecules are so large that they are termed

17. Molecular weight measures a molecule‘s-
  • (A) Density
  • (B) Size
  • (C) All of these
  • (D) pH

18. Which of the following is/are not considered as organic (s)
  • (A) Carbon monoxide
  • (B) Carbon dioxide
  • (C) Both (A) and (B)
  • (D) None of the above

19. Many of the molecules of life are held together by covalent bonds, which form when two atoms share
  • (A) Valence neutrons
  • (B) Valence electrons
  • (C) Non-valence electrons
  • (D) Whole molecule

20. Methane illustrates a non-polar covalent bond, which means that the atoms share all of the
  • (A) Electrons
  • (B) Protons
  • (C) Neutrons
  • (D) All of these

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