Chemistry class ix notes 9th class board pattern model paper
Chap-4 Structure of molecule Important questions, if you attempt these question you will get InshaAllah 100% marks.
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
Available all
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