Chap-4 Structure of molecule

 

 

Objective Part

Choose the right option.                                                                                                     10×1=10

A

B

C

D

1

Which one of the following is an electron deficient molecule

NH3

BF3

N2

O2

2

A bond formed between two non-metals is expected to be:

Covalent

Ionic

Coordinate covalent

Metallic

3

Which one of the following is the weakest force among the atoms?

Ionic force

Metallic force

Intermolecular force

Covalent force

4

Atoms of different elements react to attain noble gas configuration which is:

Stable

Non-stable

Ionic

Covalent

5

Properties of compound depend upon the nature of ______ present in compound.

Atoms

Bonding

Both a and b

None of these

6

Identify which pair has polar covalent bonds

O2 and Cl2

H2O and N2

H2O and C2H2

H2O and HCl

7

Elements attaining eight electrons in its outer most shell is called:

Duplet rule

Triplet rule

Octet rule

Hund’s rule

8

The force of attraction which holds the atom together called

Chemical bond

Physical bond

Electric bond

Hydrogen bond

9

Transfer of electrons between atoms results in:

Metallic bonding

Ionic bonding

Covalent bonding

Coordinate covalent bonding

10

Triple covalent bond involves many number of electron

Eight

Six

Four

Three

 

Subjective

Answer the short questions.                                                           10×2=20

Why HCl has dipole-dipole forces of attraction?

1.      Differentiate between lone pair and bond pair of electrons.

2.      What do you mean by induced dipole?

3.      Why the ionic compounds have high melting and boiling points?

4.      Write down any two properties of metals?

5.      What is octet rule?

6.      Define coordinate and dative covalent bonding.

7.      Define ionic bond. Write down any example of ionic bonding.

8.      Ionic compounds are solid. Justify.

9.      Why does ice float on water?

 

                                         Long Questions                  5×1=5

1.      (a) Explain the types of covalent bonds with at least one example of each type.     3

(b) What is a chemical bond and why do atoms form a chemical bond?                 2