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MCQ CHEMISTRY

Total questions: 25

Worksheet time: 18mins

Name
Class
Date
1.

What is valency of sodium?

a)

1

b)

2

c)

3

d)

4

2.
subatomic particles found on the outermost shell & responsible for the atom's reactivity
a)
neutrons
b)
valence electrons
c)
isotopes
d)
ions
3.
Value representing the number of protons in an element
a)
Atomic Mass
b)
Mass Number
c)
Valence Electrons
d)
Atomic Number
4.

WHICH ONE IS A MIXTURE?

a)

BLOOD

b)

CARBON DIOXIDE

c)

SILICON

d)

SODIUM

e)

TIN

5.

What is the solute in the soda water?

a)

Water

b)

Carbon dioxide

c)

Sugar

d)

Oxygen

6.
What are the basic building blocks for all matter?
a)
atoms
b)
elements
c)
compounds
d)
chemicals
7.
An oxygen molecule usually has two oxygen atoms.
a)
True
b)
False
8.

Aluminium has 13 protons, 1 neutrons, 13 electrons. What is the atomic number?

a)

26

b)

1

c)

13

d)

12

9.

Methane has _____ atoms

a)

1

b)

3

c)

4

d)

5

10.

molecular formula of copper and bromine is

a)

CuBr2

b)

CUBR

c)

Cu2Br

d)

CuBr

11.

Atomicity of phosphorus namaste is

a)

monoatomic

b)

Diatomic

c)

poly atomic

d)

tetra atomic

12.

H2SO4 Is the chemical formula of......

a)

Hydrogen Chloride

b)

Sulfuric acid

c)

Nitric acid

d)

Carbonic acid

13.

Valency of inert gas elements.

a)

0

b)

2

c)

1

d)

3

14.

What happens when salty water is boiled?

a)

The salt becomes a new compound and water evaporates as it has a low boiling point

b)

The water evaporates and the salt remains in the beaker as it has a high melting point

c)

The water becomes a new compound and evaporates while salt remains in the beaker

d)

The water will disappear and the salt remains in the beaker as it is a solid

15.

Which of the following separations cannot be carried out using a centrifuge? The separation of:

a)

water from wet clothes

b)

cream from milk

c)

red blood cells from plasma

d)

salt from sea water

16.

Complete the sentence:

___________ allows to separate the fine flour particles from bigger impurities (lumps).

a)

Filtration

b)

Decantation

c)

Sieving

d)

Magnetism

17.

In a coffee machine, the ground coffee is separated from the coffee solution by using..

a)

sand paper

b)

filter paper

c)

toilet paper

d)

tissue paper

18.
Iron fillings can be separated from iron and Sulphur mixture by
a)
sedementation
b)
heating
c)
magnetic attraction
d)
seiving
19.
Can you separate salt from water using filtration?
a)
yes
b)
no
20.
What is the relative molecular mass of fluorine gas, F2?
a)
19
b)
38
c)
9
d)
18
21.
What is the relative formula mass of NaOH?
a)
20
b)
39
c)
40
d)
45
22.

Name the compound PH3.

a)

Triphosphorus trihydride

b)

Phosphorus hydride

c)

Trihydrogen monophosphide

d)

Phosphorus trihydride

23.

Which of these have mass 44 u?

a)

H2O

b)

H2O2

c)

P2O5

d)

CO2

24.

Element with atomic number 8 is

a)

Carbon

b)

Nitrogen

c)

Oxygen

d)

Fluorine

25.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol

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