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Is matter around us pure

Total questions: 136

Worksheet time: 1hrs 8mins

Name
Class
Date
1.

Air is regarded as mixture because?

a)

It's pressure may vary.

b)

It's temperature may vary.

c)

Volume changes under different compositions.

d)

It's compositions may vary.

2.

In which of the following constituents are present in the fixed ratio?

a)

Mixture.

b)

Compound.

c)

Solution.

d)

Colloid.

3.

Brass is an example of?

a)

Homogeneous compound.

b)

Homogeneous mixture.

c)

Heterogeneous mixture.

d)

Heterogeneous compound.

4.

When two liquids do not mix, they form two separate layers and are known as

a)

(a) Miscible liquids

b)

(b) Immiscible liquids

c)

(c) Saturated liquids

d)

(d) Super saturated liquids

5.

brass is an alloy. It is a mixture of______

a)

30% Zinc 70% copper

b)

20% copper 80% nickel

c)

40% iron 80% copper

d)

35% gold 65% zinc

6.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

7.

What are atoms composed of?

a)

Protons and electrons.

b)

Protons, neutrons, and electrons.

c)

Neutrons and electrons.

d)

Ions, elements, and compounds.

8.

How many H atoms are in water?

a)

1

b)

2

c)

3

d)

4

9.

Blood and sea water are

a)

Blood is a mixture whereas sea water is a compound

b)

Blood is a compound and sea water is a mixture

c)

Both are mixtures

d)

Both are Compounds

10.

Define a pure substance?

a)

A pure substance consists of a single type of particles and constant composition.

b)

A pure substance consists of two different types of particles with variable composition

c)

A pure substance consists of many types of particles and different composition

11.

A sample contains two substances and has uniform properties. The sample is ________?

a)

A compound.

b)

A heterogeneous mixture.

c)

An element.

d)

A homogeneous mixture.

12.

Which of the following elements is not a metalloid?

a)

(a) Boron

b)

(b) Silicon

c)

(c) Germanium

d)

(d) Tungsten

13.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
14.
A mixture that is evenly distributed is called ...
a)
Heterozygous
b)
Heterogenous
c)
Homogenous
d)
Periodic
15.
Changing the phase, size or shape of something....
a)
Chemical change
b)
Physical Change
c)
Suspension
d)
Colloid
16.
If you change a substance into a new substance...
a)
Partial Change
b)
Physical Change
c)
Chemical Change
d)
Freezing
17.
Substance with atoms that are all alike.
a)
element
b)
compound
c)
homogeneous mixture
d)
heterogeneous mixture
18.

______________ is the homogenous mixture of 2 or more substances

a)

Colloid

b)

Tyndall Effect

c)

Solution

d)

Centrifugation

19.

Brass is an alloy of molten Copper in ___________ .

a)

solid Zinc

b)

molten Zinc

c)

gaseous Zinc

d)

molten Tin

20.

Air is regarded as a mixture because __________ .(two or more options might be correct)

a)

its pressure may vary

b)

its temperature may change

c)

its composition may vary

d)

its volume changes under different conditions

21.

In which of the following - the solute is liquid but the solvent is solid?

a)

Air containing moisture

b)

Adsorption of H2 gas in Pd

c)

Zinc amalgam

d)

Homogeneous mixture of water and ethanol

22.

What is the percentage by volume of nitrogen in atmosphere?

a)

50 %

b)

60%

c)

70%

d)

78%

23.

Rusting of an article made up of iron is called

a)

(a) corrosion and it is a physical as well as chemical change

b)

(b) dissolution and it is a physical change

c)

(c) corrosion and it is a chemical change

d)

(d) dissolution and it is a chemical change

24.

What is the name of the metal which exists in liquid state at room temperature?

a)

(a) Sodium

b)

(b) Potassium

c)

(c) Mercury

d)

(d) Bromine

25.

When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:

a)

(a) Centrifugation

b)

(b) Fractional distillation

c)

(c) Evaporation

d)

(d) Tunneling

26.

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

a)

(a) Composition of solute

b)

(b) Concentration of a solvent

c)

(c) Concentration of a solute

d)

(d) Concentration of a solution

27.

A solution of iodine in alcohol known as ‘tincture of iodine’, has ____________ as the solute and alcohol (liquid) as the solvent.

a)

IODINE

b)

WATER

c)

ALCOHOL

d)

SPIRIT

28.

A blue iris in an eye is blue due to

a)

Brownian Motion

b)

Tyndall Effect

c)

Electrophoresis

d)

Centrifugation

29.

When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.

a)

Peptization

b)

Electrophoresis

c)

Brownian Movement

d)

Tyndall Effect

30.

Coloured gemstone is an example of

a)

Gel

b)

Solid Sol

c)

Emulsion

d)

Aerosol

31.

Observe the dots in the chromatogram. Which of the following would have highest solubility?

a)

A

b)

B

c)

C

d)

All have same solubility

32.

brass is an alloy. It is a mixture of______

a)

30% Zinc 70% copper

b)

20% copper 80% nickel

c)

40% iron 80% copper

d)

35% gold 65% zinc

33.

Tyndall effect is observed in forests because of

a)

tress

b)

high oxygen level

c)

mist and dust particles in the air

d)

less sunlight

34.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

35.

Blood and sea water are

a)

blood is a mixture whereas sea water is a compound

b)

blood is a compound and sea water is a mixture

c)

both mixtures

36.

In a sugar solution water is_____ and sugar is_____

a)

water is solute and sugar is solvent

b)

water solute and as well as solvent

c)

water is solvent and sugar is solute

37.

What is the solute in the soda water?

a)

Water

b)

Carbon dioxide

c)

Sugar

d)

Oxygen

38.

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

a)

Supersaturated Solution

b)

Colloidal Solution

c)

Aqueous Solution

d)

Thermo Saturated Solution

39.

Which of the following apparatus is not required in sublimation?

a)

Condenser

b)

Funnel

c)

China Dish

d)

Wire gauze

40.

Suspension is _______ mixture

a)

Homogeneous

b)

Saturated

c)

Unsaturated

d)

Heterogenous

41.

How will you seperate oxygen from a mixture of liquid air?

a)

Centrifugation

b)

Seperating funnel

c)

Fractional distillation

d)

Distillation

42.

Tyndall effect is observed in forests because of

a)

Trees

b)

High oxygen level

c)

Mist and dust particles in the air

d)

Less sunlight

43.

Air is regarded as mixture because?

a)

It's pressure may vary

b)

It's temperature may vary

c)

Volume changes under different compositions

d)

It's compositions may vary

44.

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

a)

Supersaturated Solution

b)

Colloidal Solution

c)

Aqueous Solution

d)

Thermo Saturated Solution

45.

A sample contains two substances and has uniform properties. The

sample is

a)

A compound

b)

A heterogeneous mixture

c)

An element

d)

A homogeneous mixture

46.

what is the solute in the soda water?

a)

water

b)

carbon dioxide

c)

sugar

d)

oxygen

47.

colloids can be separated by

a)

filtration

b)

distillation

c)

sedimantation

d)

centrifugation

48.

When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:

a)

(a) Centrifugation

b)

(b) Fractional distillation

c)

(c) Evaporation

d)

(d) Tunneling

49.

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

a)

(a) Composition of solute

b)

(b) Concentration of a solvent

c)

(c) Concentration of a solute

d)

(d) Concentration of a solution

50.

When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.

a)

Peptization

b)

Electrophoresis

c)

Brownian Movement

d)

Tyndall Effect

51.

Brass is an example of?

a)

Homogeneous compound.

b)

Homogeneous mixture.

c)

Heterogeneous mixture.

d)

Heterogeneous compound.

52.

Which of the following elements is not a metalloid?

a)

(a) Boron

b)

(b) Silicon

c)

(c) Germanium

d)

(d) Tungsten

53.

A mixture will appear translucent in the case of?

a)

Copper sulphate + water.

b)

Alum + water.

c)

Sugar + water.

d)

Starch + water.

54.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
55.
If you change a substance into a new substance...
a)
Partial Change
b)
Physical Change
c)
Chemical Change
d)
Freezing
56.
Substance with atoms that are all alike.
a)
element
b)
compound
c)
homogeneous mixture
d)
heterogeneous mixture
57.

Suspension is _______ mixture

a)

Homogeneous

b)

Saturated

c)

Unsaturated

d)

Heterogenous

58.

When two liquids do not mix, they form two separate layers and are known as

a)

(a) Miscible liquids

b)

(b) Immiscible liquids

c)

(c) Saturated liquids

d)

(d) Super saturated liquids

59.

brass is an alloy. It is a mixture of______

a)

30% Zinc 70% copper

b)

20% copper 80% nickel

c)

40% iron 80% copper

d)

35% gold 65% zinc

60.

colloids can be seperated by

a)

filtration

b)

distillation

c)

sedimentation

d)

centrifugation

61.

formula to find concentration of a solution?

(a)  

62.

how will you seperate sulphur and iron fillings

a)

handpicking

b)

sieving

c)

crystallization

d)

magnetic seperation

63.

how will you seperate oxygen from a mixture of liquid air?

a)

centrifugation

b)

seperating funnel

c)

fractional distillation

d)

distillation

64.

how will you seperate the components of sugar solution

a)

evaporation

b)

crystallization

c)

filtration

d)

chromatography

65.

burning of candle is a

a)

physical change

b)

chemical change

c)

both physical and chemical change

d)

none of the above

66.

a mixture of dye in a volatile liquid can be seperated by?

a)

evaporatoion

b)

sedimentation

c)

chromatography

d)

filtration

67.

Tyndall effect is observed in forests because of

a)

tress

b)

high oxygen level

c)

mist and dust particles in the air

d)

less sunlight

68.

concentration of 36g of NaCl in 100 g of water is

a)

23%

b)

26.47%

c)

29.32%

d)

21.11%

69.

How would H2O be classified? Check all that apply.

a)

Atom

b)

Molecule

c)

Compound

70.

How would O2 be qualified. Check all answers that apply.

a)

Atom

b)

Molecule

c)

Compound

71.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

72.

What are atoms composed of?

a)

Protons and electrons.

b)

Protons, neutrons, and electrons.

c)

Neutrons and electrons.

d)

Ions, elements, and compounds.

73.
The beginning substances in a chemical reaction are called...
a)
reactants
b)
products
74.

How many H atoms are in H2O?

a)

1

b)

2

75.
Carbon dioxide (CO2) contains how many atoms of oxygen?
a)
0
b)
1
c)
2
d)
3
76.

Suspension is _______ mixture

a)

Homogeneous

b)

Saturated

c)

Unsaturated

d)

Heterogenous

77.

Cooking of food and digestion of food

a)

Are both physical processes

b)

Are both chemical processes

c)

Cooking is physical whereas digestion is chemical

d)

Cooking is a chemical whereas digetion is physical

78.

Which of the following are homogeneous in nature?

(1) Ice (2) Wood (3) Soil (4) Air

a)

(1) and (3)

b)

(2) and (4)

c)

(1) and (4)

d)

(3) and (4)

79.

Tyndall effect is observed in forests because of

a)

Trees

b)

High oxygen level

c)

Mist and dust particles in the air

d)

Less sunlight

80.

Air is regarded as mixture because?

a)

It's pressure may vary

b)

It's temperature may vary

c)

Volume changes under different compositions

d)

It's compositions may vary

81.

When a saturated solution is heated and more solute is dissolved in it, what is such a solution called?

a)

Supersaturated Solution

b)

Colloidal Solution

c)

Aqueous Solution

d)

Thermo Saturated Solution

82.

A sample contains two substances and has uniform properties. The

sample is

a)

A compound

b)

A heterogeneous mixture

c)

An element

d)

A homogeneous mixture

83.

colloids can be separated by

a)

filtration

b)

distillation

c)

sedimantation

d)

centrifugation

84.

What is the percentage by volume of nitrogen in atmosphere?

a)

50 %

b)

60%

c)

70%

d)

78%

85.

What is the name of the metal which exists in liquid state at room temperature?

a)

(a) Sodium

b)

(b) Potassium

c)

(c) Mercury

d)

(d) Bromine

86.

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

a)

(a) Composition of solute

b)

(b) Concentration of a solvent

c)

(c) Concentration of a solute

d)

(d) Concentration of a solution

87.

Blood and sea water are

a)

blood is a mixture whereas sea water is a compound

b)

blood is a compound and sea water is a mixture

c)

both are mixtures

d)

both are compounds

88.

The method used in washing machines to squeeze out water from wet clothes

a)

Sublimation

b)

Distillation

c)

Centrifugation

d)

Chromatography

89.

Brass is an alloy. It is a mixture of______

a)

30% Zinc 70% copper

b)

20% copper 80% nickel

c)

40% iron 80% copper

d)

35% gold 65% zinc

90.

Which of the following is not a compound?

a)

Ozone

b)

Graphite

c)

Nitrogen

d)

All of these

91.

Pick the heterogeneous mixture among the following

a)

Smoke

b)

Brass

c)

Sugar solution

d)

Salt solution

92.

When two liquids do not mix, they form two separate layers and are known as

a)

(a) Miscible liquids

b)

(b) Immiscible liquids

c)

(c) Saturated liquids

d)

(d) Super saturated liquids

93.

What is an element?

a)

A pure substance that cannot be broken down.

b)

Two atoms bonded together.

c)

Two or more different types of atoms bonded together.

d)

An molecule with an unequal distribution of charge.

94.

What are atoms composed of?

a)

Protons and electrons.

b)

Protons, neutrons, and electrons.

c)

Neutrons and electrons.

d)

Ions, elements, and compounds.

95.

How many H atoms are in water?

a)

1

b)

2

c)

3

d)

4

96.

Define a pure substance?

a)

A pure substance consists of a single type of particles and constant composition.

b)

A pure substance consists of two different types of particles with variable composition

c)

A pure substance consists of many types of particles and different composition

97.
Changing the phase, size or shape of something....
a)
Chemical change
b)
Physical Change
c)
Suspension
d)
Colloid
98.
If you change a substance into a new substance...
a)
Partial Change
b)
Physical Change
c)
Chemical Change
d)
Freezing
99.

Suspension is _______ mixture

a)

Homogeneous

b)

Saturated

c)

Unsaturated

d)

Heterogenous

100.

Cooking of food and digestion of food

a)

Are both physical processes

b)

Are both chemical processes

c)

Cooking is physical whereas digestion is chemical

d)

Cooking is a chemical whereas digetion is physical

101.

burning of candle is a

a)

physical change

b)

chemical change

c)

both physical and chemical change

d)

none of these

102.

Purified water is a

a)

Element

b)

Compound

c)

Mixture

d)

Atom

103.

Gas to liquid

a)

Centrifugation

b)

Sublimation

c)

Filtration

d)

Condensation

104.

15 % of alcohol solution means

a)

15ml alcohol and 85 ml water

b)

15 ml alcohol and 100 ml of water

c)

15ml of water and 85 ml alcohol

d)

none of these

105.

Identify the chemical change

a)

Burning of coal

b)

Melting of ice

c)

Tearing paper

d)

MIxing salt and sand

106.

Name the property through which metals shine.

a)

Platinum

b)

Diamond

c)

Malleability

d)

Lustre

107.

Due to which property does a bell ring?

a)

Sonority

b)

Conductivity

c)

Ductility

d)

Malleability

108.

Choose a metal which is soft.

a)

Sodium

b)

Copper

c)

Graphite

d)

Gold

109.

It is a good conductor of heat.

a)

Non metal

b)

Metal

c)

Metalloids

d)

graphite

110.

The process of removing impurities from a solution by using filter paper is called as

a)

Chromatography

b)

Filtration

c)

Sublimation

d)

Solution

111.

This is made up of one or more of the same kind of atom

a)

Element

b)

compound

c)

mixture

d)

matter

112.
What is a chemical change 
a)
wood burning 
b)
melting butter 
c)
salt dissolving 
d)
wind blowing 
113.

Aerated drinks like soda water etc., are gas in liquid solutions. These contain______________(gas) as solute and water (liquid) as solvent

a)

CARBON DIOXIDE

b)

OXYGEN

c)

NITROGEN

d)

HELIUM

114.

Air is a mixture of gas in gas. Air is a homogeneous mixture of a number of gases. Its two main constituents are:OXYGEN IS______ and nitrogen (78%).

a)

20%

b)

21%

c)

90%

d)

70%

115.

, brass is a mixture of approximately ______ zinc and 70% copper.

a)

30%

b)

40%

c)

60%

d)

100%

116.

This is made up of one or more of the same kind of atom

a)

Element

b)

compound

c)

mixture

d)

matter

117.

Which of the following are also considered to be states of matter?

a)

Plasma

b)

Platelets

c)

BEC (Bose Einstein Condensate)

d)

BHC

118.

One of the following does not undergo sublimation. This one is

a)

Iodine

b)

Camphor

c)

Sodium chloride

d)

Ammonium chloride

119.

When heat is constantly supplied by a gas burner with small flame to melt the ice, then the temperature of the ice during melting

a)

increases very slowly

b)

does not increase at all

c)

first remains constant then increases

d)

increases to form liquid water

120.

When heat is constantly supplied by a burner to boiling water, then the temperature of the water during vaporization

a)

rises very slowly

b)

rises rapidly until the steam is produced

c)

first rises and then becomes constant

d)

does not rise at all

121.

During summer days, water kept in an earthen pot becomes cool because of the phenomenon of

a)

diffusion

b)

transpiration

c)

osmosis

d)

evaporation

122.

On converting 308K, 329K and 391K to Celsius scale, the correct sequence of temperature will be

a)

330C, 560C, 1180C

b)

350C, 560C, 1190C

c)

350C, 560C, 1180C

d)

560C, 1190C, 350C

123.

Which of the following energy is absorbed during change of state of substance?

a)

Specific heat

b)

Latent heat

c)

Heat capacity

d)

Heat of solution

124.

Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air? (More than one option is correct)

a)

increase in pressure

b)

increase in temperature

c)

decrease in pressure

d)

decrease in temperature

125.

During respiration, glucose and oxygen enter our body cells and waste products leave the body cells by the process of

a)

effusion

b)

osmosis

c)

diffusion

d)

plasmolysis

126.

The evaporation of water increases under the following conditions

a)

increase in temperature, decrease in surface area

b)

increase in surface area, decrease in temperature

c)

increase in surface area, increase in temperature

d)

increase in surface area, increase in temperature, addition of common salt

127.

Which of the following is not an element?

a)

Graphite

b)

Germanium

c)

Silica

d)

Silicon

128.

Which of the following are compounds? (More than one option is true)

a)

CO

b)

NO

c)

No

d)

Co

129.

Name three mixtures found in nature

4 lines
130.

Name a metal which is soft and a non metal which is hard

4 lines
131.

An element is made up of only one kind of (a)   .

132.

The elements which are sonorous are called

a)

metal

b)

non-metal

c)

alloy

d)

None of the above

133.

Chlorine gas is an example of

a)

Compound

b)

Mixture

c)

Element

d)

None of the above

134.

What elements does sugar contain? (More than one option may be true)

a)

Carbon

b)

Sodium

c)

Oxygen

d)

Sulphur

e)

Hydrogen

135.

Which of the following is true for wood?

a)

Wood is an element

b)

Wood is a compound

c)

Wood is a homogenous mixture

d)

Wood is a heterogenous mixture

136.

Is milk a pure substance?

a)

Yes

b)

No

c)

May be

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