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
