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ATOMS AND MOLECULES -CLASS -9 by PRABHAKAR MIRIYALA

Total questions: 30

Worksheet time: 31mins

Name
Class
Date
1.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
2.
When __________ form, the elements lose there individual chemical properties and take on new properties.
a)
compounds
b)
atoms
c)
subscript
d)
formula
3.

Atomicity is ......

a)

the number of atoms present in an element.

b)

the number of atoms present in a molecule.

c)

atomic mass

d)

none of the above

4.

The short-hand notation of an element is called....

a)

formula

b)

symbol

c)

mark

d)

representation

5.

The bonding capacity of an element is called......

a)

Atomic number

b)

Atomic Mass Unit

c)

Molecular mass

d)

Valency

6.

"Total mass of the products formed in chemical reaction is exactly equal to the total mass of the reactants present in it." is a .....

a)

Law of constant proportion

b)

Law of multiple proportion

c)

Law of conservation of mass

d)

All the above

7.

"In a compound, the elements always present in the fixed ratio of their mass." is a ....

a)

Law of constant proportion

b)

Law of conservation of mass

c)

Law of multiple proportion

d)

None of the above

8.

Who proposed Law of Conservation of mass?

a)

Proust

b)

Dalton

c)

Democrats

d)

Lavoisier

9.

Who proposed Law of constant proportion?

a)

John Dalton

b)

Joseph L Proust

c)

Lavoisier

d)

Neil's Bohr

10.

'S' is the symbol of ....

a)

Silicon

b)

Sulfur

c)

Sodium

d)

Above all

11.

The symbol of Gold is......

a)

G

b)

Ag

c)

Au

d)

Go

12.

The Latin name of Potassium is......

a)

Natrium

b)

Kalium

c)

Plum bum

d)

None of the above

13.

Hydragyrum is the Latin name of ......

a)

Iron

b)

Mercury

c)

Tin

d)

Tungsten

14.

Chemical formula of Sodium Carbonate.

a)

NaHCO3

b)

Na2CO3

c)

NaOH

d)

Na2SO4

15.

Valency of inert gas elements.

a)

0

b)

2

c)

1

d)

3

16.
Which of the models below represent a molecule? 
a)
A
b)
B
c)
C
d)
D
17.

Atomic symbol of Copper

a)

C

b)

Co

c)

Cp

d)

Cu

18.

The Latin name of Potassium is......

a)

Natrium

b)

Kalium

c)

Plum bum

d)

None of the above

19.

an example of polyatomic molecule is

a)

sulphur

b)

oxygen

c)

chlorine

d)

argon

20.
What is the molar mass of CO2?
a)
22.0 g/mol
b)
28.0 g/mol
c)
44.0 g/mol
d)
56.0 g/mol
21.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
22.

Atomicity of Ozone is

a)

2

b)

4

c)

8

d)

3

23.

Which of the following is correct symbol of Aluminium

a)

al

b)

AL

c)

Al

d)

aL

24.

The Latin word for water is

a)

hydro

b)

oxy

c)

helio

d)

aurum

25.

One mole of any gas occupies ----------- liters of volume at STP

a)

6.022 x 1023

b)

22.4

c)

12

d)

100

26.

what is the molecular mass of H2SO4 ( H=1U; S=32U; O=16U)

a)

98 U

b)

49 U

c)

18 U

d)

126 U

27.

What is the ration of Carbon and Oxygen atoms in CO2

a)

1:1

b)

2:1

c)

1:2

d)

1:3

28.

What is symbol of Carbonate Ion

a)

CO32-

b)

CO3+2

c)

Cu+2

d)

Cl-

29.

Atomic mass is expressed in

a)

grams

b)

kilograms

c)

amu

d)

mole

30.

Which is used as a standard reference for measuring atomic masses of other elements

a)

atomic mass of C-12

b)

atomic mass of O-16

c)

Atomic mass of H-1

d)

atomic mass of Ne-10

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