Chemical Bonding - Chapter No 4

Right Answers have been shown below in red color.

1. The element with their complete outermost shell, are called__________ elements.

a) inert
b) reactive
c) valency
d) none of these

2. The element with their incomplete outermost shell, are called ________ elements.

a) inert
b) reactive
c) repulsion
d) none of these

3. The valency of oxygen is__________.

a) 6
b) 2
c) 4
d) 13

4. The valency of halogen is __________.

a) one
b) five
c) three
d) six

5. The force with which atoms combine with each other, is called_________.

a) valency
b) chemical bond
c) three
d) none of these

6. There are________ main types of chemical bonds.

a) four
b) three
c) two
d) five

7. The electrostatic attraction between positive and negative ions in an ionic compound is called an __________ bond.

a) ionic
b) covalent
c) co-ordinate covalent bond
d) none of these

8. The ionic-bond is also called _________.

a) co-ordinate covalent bond
b) electrovalent
c) covalent
d) none of these

9. The formation of “NaCl” is an example of___________.

a) ionic bond
b) covalent
c) ionization energy
d) none of these

10. The formation of “MgO” is an example of a ________ bond.

a) covalent
b) ionic
c) atomic
d) none of these

11. In the formation of ionic bond, the number of electrons lost must be _________ to the number of electrons gained.

a) equal
b) different
c) negative
d) covalent

12. The atom which loses electrons becomes ___________.

a) anion
b) cation
c) electron
d) none of these

13. The atom which gains electrons, becomes___________.

a) electron
b) cation
c) anion
d) none of these

14. An element forming positive ion must have__________ ionization potential.

a) low
b) great
c) small
d) none of these

15. The ____________ energy is required to convert sodium to sodium positive ion.

a) 496 J
b) 469 J/mole
c) 495 kJ/mole
d) 694k J/mole

16. When chlorine is converted in to chloride ion then ___________ energy is released.

a) -348 k J/mole
b) 439 k J /mole
c) 495 k J/ mole
d) none of these

17. Ionic compounds are generally _________ at room temperature.

a) liquid
b) solid
c) water
d) none of these

18. The reaction of ionic compounds are very_________.

a) fast
b) slow
c) equal
d) covalent

19. The formation of hydrogen molecule (H2) is an example of_________.

a) covalent bond
b) ionic bond
c) hydrogen bond
d) none of these

20. The atoms having electro negativity difference___________ 1.7 from covalent bond.

a) equal to
b) same as
c) less than
d) greater than

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