Is Matter Pure?  AP 9th Class Physical Science Bits 3rd Lesson 

Is Matter Pure?  AP 9th Class Physical Science Bits 3rd Lesson 

Question 1.
Pure substance among the following is
A) sodium chloride
B) copper sulphate
C) gold
D) air
Answer:
C) gold

Question 2.
The components of a solution are
A) solute
B) solvent
C) both A & B
D) no components
Answer:
C) both A & B

Question 3.
If the amount of solute is less than the saturation level of a solution, then the solution is said to be
A) saturated solution
B) unsaturated solution
C) super saturated solution
D) heterogeneous solution
Answer:
B) unsaturated solution

Question 4.
Factors effecting the solubility are
A) temperature of the solvent
B) size of the particles of the solute
C) stirring of contents
D) all the above
Answer:
D) all the above

Question 5.
The measurement of amount of solute that dissolves in a solvent is
A) solubility
B) diluted
C) concentrated
D) saturated
Answer:
A) solubility

Question 6.
Which of the following is an emulsion?
A) salt solution
B) mixture of oil and water
C) nail polish
D) cheese
Answer:
B) mixture of oil and water

Question 7.
Which of the following is a suspension?
A) salt solution
B) mixture of oil and water
C) nail polish
D) cheese
Answer:
C) nail polish

Question 8.
Which of the following is a colloidal dispersion ?
A) salt solution
B) mixture of oil and water
C) nail polish
D) cheese
Answer:
D) cheese

Question 9.
Which of the following is miscible liquid ?
A) sand in water
B) alcohol in water
C) oil in water
D) none
Answer:
B) alcohol in water

Question 10.
Immiscible liquids can he separated by
A) separating funnel
B) centrifuge
C) fractional distillation column
D) filtration
Answer:
A) separating funnel

Question 11.
Example of compound is
A) mercury
B) copper sulphate
C) aluminium
D) boron
Answer:
B) copper sulphate

Question 12.
Something with no adulteration means …………………. substance.
A) pure
B) impulse
C) specific
D) normal
Answer:
A) pure

Question 13.
When mixture of liquids are spun rapidly …………………. component stay at the top. This is the principle of …………………..
A) heavier, churning
B) lighter, churning
C) heavier, mixing
D) lighter, mixing
Answer:
B) lighter, churning

Question 14.
When the components of the mixture formed are uniformly distributed through out it there it is called ………………….. mixture.
A) homogeneous
B) heterogeneous
C) aqueous
D) settle
Answer:
A) homogeneous

Question 15.
When the components of the mixture formed are not distributed uniformly throughout it, then the mixture is called ……………………. mixture.
A) homogeneous
B) heterogeneous
C) aqueous
D) none
Answer:
B) heterogeneous

Question 16.
In a solution, the substance which dissolves another is called ……………………..
A) solution
B) solute
C) solvent
D) solubility
Answer:
C) solvent

Question 17.
In a solution, the substance which dissolved in another is called …………………
A) solution
B) solute
C) solvent
D) solubility
Answer:
B) solute

Question 18.
Example for solid solution is ………………….
A) alloy
B) aerated drinks
C) amalgum
D) salt solution
Answer:
A) alloy

Question 19.
The amount of solute present in a saturated solution at a certain temperature is called …………………..
A) dissolution
B) solubility
C) concentration
D) none of these
Answer:
B) solubility

Question 20.
If the amount of solute is little in a solution, then it is said to be ………………….. solution.
A) diluted
B) concentrated
C) aqueous
D) none of these
Answer:
A) diluted

Question 21.
If the amount of solute is more in a solution, then it is said to be ……………….. solution.
A) diluted
B) concentrated
C) aqueous
D) none of these
Answer:
B) concentrated

Question 22.
The amount of solute present in a given amount of solution is called …………………….. of the solution.
A) diluted
B) solubility
C) concentration
D) none of these
Answer:
C) concentration

Question 23.
Mass by mass percentage of a solution =
A)  mass of solute  mass of solution  × 100
B)  mass of solute  mass of solvent  × 100
C)  mass of solution  mass of solute  × 100
D)  mass of solvent  mass of solute  × 100
Answer:
A)  mass of solute  mass of solution  × 100

Question 24.
A mixture consisting of two liquids that do not mix and settle into layers when they left undisturbed is called …………………….
A) solution
B) suspension
C) emulsion
D) none of these
Answer:
C) emulsion

Question 25.
A heterogeneous mixture in which the solute particles do not dissolve and are visible to naked eye is called ………………………..
A) solution
B) suspension
C) emulsion
D) colloidal
Answer:
B) suspension

Question 26.
Coloured pigments in plants can be separated by ………………………..
A) distillation
B) evaporation
C) fractional distillation
D) paper chromatography
Answer:
D) paper chromatography

Question 27.
A liquid is said to be ……………….. if it dissolves completely.
A) miscible
B) immiscible
C) both A & B
D) none of these
Answer:
A) miscible

Question 28.
A liquid is said to be ………………….. if it does not dissolve but form a layer over another liquid.
A) miscible
B) immiscible
C) both A & B
D) neither A nor B
Answer:
B) immiscible

Question 29.
If the difference in boiling points of two miscible liquids is greater than 25°C, then they are separated by ……………………..
A) distillation
B) fractional distillation
C) separating funnel
D) evaporation
Answer:
A) distillation

Question 30.
Statement – I : Air is homogeneous mixture of many gases.
Statement – II: They are separated by fractional distillation.
A) Both the statements are true.
B) Statement -1 is true and statement – II is false.
C) Statement -1 is false and statement – II is true.
D) Both the statements are false.
Answer:
A) Both the statements are true.

Question 31.
Substances which can be separated into two or more components by chemical reactions are called as ……………………….
A) elements
B) mixtures
C) compounds
D) none of these
Answer:
C) compounds

Question 32.
The basic form of matter that cannot be broken down into simpler substances in chemical reactions is ……………………
A) element
B) compound
C) mixture
D) none of these
Answer:
B) compound

Question 33.
The first definition of an element is given by …………………..
A) Robert Boyle
B) Hennig Brand
C) Lavoisier
D) Burzelius
Answer:
C) Lavoisier

Question 34.
Some liquids have the property of mixing in all proportions, forming a homogeneous solution. This property is known as …………………….
A) miscibility
B) solubility
C) immiscibility
D) none of these
Answer:
A) miscibility

Question 35.
………………….. is the main factor in separating two immiscible liquids.
A) Pressure
B) Volume
C) Density
D) Mass
Answer:
C) Density

Question 36.
………………… are heterogeneous mixtures in which the particle size is too small to be seen with the naked eye but is big enough to scatter fight.
A) Suspension
B) Solutions
C) Colloids
D) None of these
Answer:
C) Colloids

Question 37.
Air is a …………………..
A) mixture
B) colloid
C) solution
D) none of these
Answer:
C) solution

Question 38.
Nail polish is a …………………..
A) solution
B) colloid
C) suspension
D) none of these
Answer:
C) suspension

Question 39.
Sodium is an …………………..
A) element
B) compound
C) suspension
D) emulsion
Answer:
A) element

Question 40.
Methane is an ……………………..
A) element
B) compound
C) suspension
D) emulsion
Answer:
B) compound

Question 41.
Steel is a ………………….
A) solid solution
B) liquid solution
C) gaseous solution
D) salt solution
Answer:
A) solid solution

Question 42.
Cold cream is ……………………….
A) solution
B) suspension
C) colloid
D) emulsion
Answer:
D) emulsion

Question 43.
Assertion (A) : Air is compound substance.
Reason (R) : We can separate air into two or more components only by means of a chemical reaction.
A) A and R are true
B) A and R are false
C) A is true but R is false
D) A is false but R is true
Answer:
B) A and R are false

Question 44.
All the solutions are ‘x’s. But not all ‘x’s are solutions. Guess the ‘x’.
A) Pure substance
B) Mixture
C) Atom
D) Liquid
Answer:
B) Mixture

Question 45.
If a solution is diluted, the path of the fight beam is
A) Visible
B) Not visible
C) Lightly visible
D) Sometimes visible
Answer:
B) Not visible

Question 46.
‘A’ is a mixture. No particles are settled down when it left undisturbed for sometime. Light beam is visible through it. Guess the ‘A’.
A) Solution
B) Colloid
C) Suspension
D) A or B
Answer:
B) Colloid

Question 47.
Take concentrated solution of copper sulphate in a beaker. Drop a piece of aluminium foil in it. Then,
A) Copper deposites on the aluminium foil
B) Aluminium dissolves
C) The solution becomes colourless
D) A and C
Answer:
D) A and C

Question 48.
Copper cannot be separated from copper sulphate by physical methods. So, it is
A) mixture
B) compound
C) A or B
D) colloid
Answer:
B) compound

Question 49.
The mixture of water and sugar is
A) suspension
B) colloid
C) homogeneous mixture
D) heterogeneous mixture
Answer:
C) homogeneous mixture

Question 50.
In a solution of tincture iodine, alcohol is
A) solution
B) solvent
C) solute
D) does not exist
Answer:
B) solvent

Question 51.
The technique used to separate the mixture of camphor and water is
A) distillation
B) fractional distillation
C) sublimation
D) handpicking
Answer:
C) sublimation

Question 52.
Miscible liquids, when the difference between their boiling points is < 25°C can be separated by
A) separating funnel
B) distillation
C) fractional distillation
D) evaporation
Answer:
C) fractional distillation

Question 53.
The scattering of beam of light when light passes through a colloidal solution is ………………………….
A) Raman effect
B) Crompton effect
C) Photo electric effect
D) Tyndall effect
Answer:
D) Tyndall effect

Question 54.
Dye present in an ink can be separated by ………………..
A) distillation
B) evaporation
C) fractional distillation
D) paper chromatography
Answer:
B) evaporation

Question 55.
Urine is boiled down to discover phosphorous by ……………………
A) Robert Boyle
B) Hennig Brand
C) Lavoisier
D) Burzelius
Answer:
B) Hennig Brand

Question 56.
Acetone and water are separated by ………………..
A) Distillation
B) Chromatography
C) Sublimation
D) Fractional distillation
Answer:
A) Distillation

Question 57.
Kerosene and water are separated by ………………….
A) Distillation
B) Separating funnel
C) Sublimation
D) Fractional distillation
Answer:
B) Separating funnel

Question 58.
Assertion (A) : Water + sugar is a solution.
Reason (R) : If we pass beam of light through a solution, it scatters light.
A) A and R are true
B) A and R are false
C) A is true but R is false
D) A is false but R is true
Answer:
C) A is true but R is false

Question 59.
Take two test tubes with some water. Add salt powder to one test tube and add crystals of salt to the second one. Observe. From your observation you may conclude that solubility depends upon
A) temperature
B) size of the solute
C) stirring
D) above all
Answer:
B) size of the solute

Question 60.
The correct process is
a) add solvent more to dilute a solution
b) add solute more to dilute a solution
c) add solute more to concentrate a solution
d) add solvent more to concentrate a solution
A) b, d
B) a, c
C) b, c
D) a, d
Answer:
D) a, d

Question 61.
Which of the given device is used to separate a mixture of kerosene and water ?
A) conical flask
B) burette
C) pipette
D) test tube
Answer:
B) burette

Question 62.
Tindal effect observes in the following substances by passing light through it
A) salt solution
B) milk
C) copper sulphate solution
D) starch solution
A) B only
B) A, D
C) C only
D) B, D
Answer:
A) B only

Question 63.
Which apparatus is required to check whether milk is colloid or true solution ?
A) filter paper
B) laser light
C) burner
D) A and B
Answer:
B) laser light

Question 64.
How do you examine whether a starch solution is colloid or suspension ?
A) By sending light beam
B) By leaving undisturbed for some-time
C) By heating it
D) Any of the above
Answer:
B) By leaving undisturbed for some-time

Question 65.
How do you separate a miscible liquid in your lab ?
A) By using separating funnel
B) By using distillation method
C) By using evaporation method
D) By using sublimation method
Answer:
B) By using distillation method

Question 66.
Cream from milk can be separated by
A) centrifugation
B) distillation
C) fractional distillation
D) chromatography
Answer:
A) centrifugation

Question 67.
Tyndall effect cannot be shown by
A) colloids
B) suspensions
C) emulsions
D) solutions
Answer:
D) solutions

Question 68.
The component of the air among the following which has the highest boiling point is
A) nitrogen
B) argon
C) methane
D) oxygen
Answer:
C) methane

Question 69.
The first definition for ‘element’ is given by
A) Lavoisier
B) Hennig Brand
C) Sir Humphry Davy
D) Robert Boyle
Answer:
A) Lavoisier

Question 70.
Coloured gem stone is an example of …………………
A) solution
B) suspension
C) colloid
D) emulsion
Answer:
C) colloid

Question 71.
Ink is mixture of …………………. in water.
A) dye
B) salt
C) sugar
D) acid
Answer:
A) dye

Question 72.
The term element is first used by ……………………
A) Robert Boyle
B) Hennig Brand
C) Lavoisier
D) Burzelius
Answer:
A) Robert Boyle

Question 73.
Percentage of oxygen in air by volume ………………………
A) 20.9%
B) 78.1%
C) 0.03%
D) 0.1%
Answer:
A) 20.9%

Question 74.
Percentage of nitrogen in air by volume ………………………
A) 20.9%
B) 78.1%
C) 0.03%
D) 0.1%
Answer:
B) 78.1%

Question 75.
Percentage of argon in air by volume
A) 20.9%
B) 78.1%
C) 0.03%
D) 0.9%
Answer:
D) 0.9%

Question 76.
Components of blood sample are separated by ………………..
A) Distillation
B) Sublimation
C) Fractional distillation
D) Centrifugation
Answer:
D) Centrifugation

Question 77.
Naphthalene in water separated by ………………….
A) distillation
B) chromatography
C) sublimation
D) centrifugation
Answer:
C) sublimation

Question 78.
Petrochemicals are separated by …………………..
A) fractional distillation
B) distillation
C) sublimation
D) separating funnel
Answer:
A) fractional distillation

Question 79.
A) kerosene + salt
B) water + salt
C) water + sugar
D) salt + sugar
In the above mixtures, heterogeneous is /are
A) B, C
B) A, B, C
C) A
D) A, D
Answer:
D) A, D

Question 80.
a) sugar water
b) tincture of iodine
c) soda water
d) salt water
The above given mixtures are
A) Homogeneous mixtures
B) Heterogeneous mixtures
C) Solutions
D) A and C
Answer:
D) A and C

Question 81.

Mixture	Path of the light	Settle down of solute
X	visible	yes
Y	not visible	no

X and Y are
A) suspension and solution
B) suspension and colloid
C) solution and suspension
D) colloid and suspension
Answer:
A) suspension and solution

Question 82.
Milk, butter, cheese, cream, gel, boot polish
These are
A) suspensions
B) colloids
C) solutions
D) B & C
Answer:
B) colloids

Question 83.

	Size of the particles In a mixture
A	< nm
B	1 nm – 100nm
C	> 100nm

Substance ‘C’ is
A) Milk
B) Salt water
C) Air
D) Butter milk
Answer:
D) Butter milk

Question 84.
(a) set A : fog, clouds, mist
(b) set B : foam, rubber, sponge
(c) set C : jelly, cheese, butter
Which of the above is contained solid as dispersion media ?
A) b
B) c
C) a
D) b and c
Answer:
D) b and c

Question 85.

Which of the above are pure substances ?
A) a, d
B) d, e
C) e
D) a, b, c
Answer:
C) e

Question 86.
What would you notice from the given figure ?

A) Pure substances
B) Mixtured substances
C) Both A and B
D) None
Answer:
A) Pure substances

Question 87.
What would you notice from the given figure?

A) Pure substances
B) Mixtured substances
C) Both A and B
D) None
Answer:
B) Mixtured substances

Question 88.
Name the set up given in the figure.

A) Separation funnel
B) Fractional distillation
C) Separation of components in air
D) None
Answer:
B) Fractional distillation

Question 89.
Name the set up given in the figure.

A) Separation funnel
B) Fractional distillation
C) Separation of components in air
D) None
Answer:
A) Separation funnel

Question 90.
Name the set up given in the figure.

A) Separation funnel
B) Fractional distillation
C) Separation of components in air
D) None
Answer:
C) Separation of components in air

Question 91.

The given figure is related to
A) sublimation
B) fractional distillation
C) paper chromatography
D) evaporation
Answer:
C) paper chromatography

Question 92.

This is a diagram of a separating fun-nel. The parts 1 and 2 are ………………., …………… respectively.
A) low density liquid, high density liquid
B) low density gas, high density liquid
C) high density liquid, low density liquid
D) high density gas, low density liquid
Answer:
A) low density liquid, high density liquid

Question 93.
‘Churning makes the lighter components to come to the surface when a mixture of liquids are spun rapidly’. This principle is used in
A) Refrigerators
B) Centrifuge
C) Microscope
D) Rice cookers
Answer:
B) Centrifuge

Question 94.
Generally solid solutions are available in
A) alloys
B) gems
C) glasses
D) above all
Answer:
D) above all

Question 95.
80 ml of solution contains 20 gr of solute. The mass by volume percentage of the solution is
A) 20%
B) 40%
C) 25%
D) 80%
Answer:
C) 25%

Question 96.
Anitha observed, ‘Shake well before use’ on a label of cough syrup bottle. ‘ The syrup is
A) solution
B) colloid
C) suspension
D) above all
Answer:
C) suspension

Question 97.
Ravi observed a beam of sun light passing through a small hole on the roof, into the room. It is formed because
A) air is colloid
B) air is true solution
C) air is suspension
D) air is pure substance
Answer:
A) air is colloid

Question 98.
Tyndall effect is observed by
A) colloids
B) solutions
C) suspensions
D) pure substances
Answer:
A) colloids

Question 99.
Which of the given mixtures cannot be separated by simple physical method ?
A) Husk in grains
B) Stones in rice
C) Fat in milk
D) Oxygen from water
Answer:
D) Oxygen from water

Question 100.
Which method is suitable to separate salt from sea water ?
A) sublimation
B) evaporation
C) chromatography
D) distillation
Answer:
B) evaporation

Question 101.
Petroleum is separated into its components by
A) distillation
B) fractional distillation
C) evaporation
D) filtration
Answer:
B) fractional distillation

Question 102.
Sir, Humphry Davy is appreciable, because, he was extremely successfuil in
A) discovering many elements like Na, Mg, B, Cl, etc.
B) giving useful definition of element.
C) separating of components of air.
D) above all
Answer:
A) discovering many elements like Na, Mg, B, Cl, etc.

Question 103.
The mass by mass percentage concentration of a 100g salt solution, which contains 20g salt is
A) 10%
B) 20%
C) 30%
D) 50%
Answer:
B) 20%

Question 104.
The separation technique to separate sodium chloride from its solution in water is
A) sublimation
B) condensation
C) evaporation
D) filtration
Answer:
C) evaporation

Question 105.
By which method do you separate Ammonium chloride from a mixture containing Sodium chloride and Ammonium chloride ?
A) sublimation
B) condensation
C) evaporation
D) filtration
Answer:
A) sublimation

Question 106.
How do you separate small pieces of metal in the engine oil of a car ?
A) sublimation
B) condensation
C) evaporation
D) filtration
Answer:
D) filtration

Question 107.
How do you separate different pigments from an extract of flower petals ?
A) sublimation
B) chromatography
C) evaporation
D) distillation
Answer:
B) chromatography

Question 108.
In your home, how do you separate butter from curd ?
A) evaporation
B) chromatography
C) churning
D) distillation
Answer:
C) churning

Question 109.
Match the following.

Technique to separate	Mixture
a) Magnet	1. oil and water
b) Separating funnel	2. tea leaves and tea
c) Filtration	3. iron and sand

1. A) a – 3, b – 2, c -1
   B) a – 2, b -1, c – 3
   C) a -1, b – 2, c – 3
   D) a – 3, b -1, c – 2
   Answer:
   D) a – 3, b -1, c – 2

Question 110.
This is not a property of colloid.
A) scattering light
B) tyndall effect
C) sedimentation
D) A and C
Answer:
C) sedimentation

Question 111.
Some colloids in your home are
A) gel
B) milk
C) oil
D) boot polish
A) A, B
B) B, C
C) A, B, D
D) A, B, C
Answer:
A) A, B

Question 112.
Some pure substances in your home are
a) ice
b) milk
c) iron
d)air
e) water
f) gold
g) coal
A) a, b, c, d
B) c, b, d, g
C) d, e, f, g
D) a, c, e, f, g
Answer:
D) a, c, e, f, g

Question 113.
Ice cream is a
A) suspension
B) colloid
C) emulsion
D) solution
Answer:
B) colloid

Question 114.
The ingredients in ice cream are………………
A) milk
B) sugar
C) flavours
D) all of these
Answer:
D) all of these

Question 115.
Shaving cream is a …………….. type of colloid.
A) foam
B) emulsion
C) aerosol
D) solution
Answer:
A) foam

Question 116.
In automobile exhaust, the dispersion medium is ………………..
A) solid
B) liquid
C) gas
D) solution
Answer:
C) gas

Question 117.
Clouds are ………………..
A) solution
B) suspension
C) colloid
D) emulsion
Answer:
C) colloid

Question 118.
Colloidal solutions are heterogeneous in nature and always consist of altleast two phases, the disperse phase and the dispersion medium. Which of the following is not a colloidal solution ?
A) Shoe polish
B) Mud water
C) Gel
D) Ice cream
Answer:
B) Mud water

Question 119.
Acetone – Water : Distillation : : Ammonium chloride – Salt:
A) Sedimentation
B) Filtration
C) Sublimation
D) Fractional distillation
Answer:
C) Sublimation

Question 120.
The correct order of sentences related to preparation of super saturated solution is
P. Add one more spoon of sugar to it
Q. Add one spoon of sugar to 100 ml of water in a breaker
R. On heating the undissolved sugar dissolves to form a super saturated solution
S. It dissolves totally to form saturated solution
A) Q, S, P, R
B) Q, R, P, S
C) P, Q, R, S
D) Q, P, R, S
Answer:
A) Q, S, P, R

Question 121.
On mixing of dil. hydrochloric acid to the mixture of iron dust and sulphur powder we obtain two gases. One of them is hydrogen and another would be
A) Sulphur dioxide
B) Hydrogen sulphide
C) Sulphur trioxide
D) Oxygen
Answer:
A) Sulphur dioxide

Question 122.
Assertion (A) : We feel cool after sweating.
Reason (R) : We store water in earthen pots during summer.
A) Both (A), (R) are correct, (R) is not the correct explanation of (A).
B) (A) is correct, (R) is incorrect.
C) (A) is incorrect, (R) is correct.
D) Both (A), (R) are correct, (R) is the correct explanation of (A).
Answer:
A) Both (A), (R) are correct, (R) is not the correct explanation of (A).

Question 123.
Assertion (A) : Chromatography is used to separate the coloured pigments in flowers.
Reason (R) : Chromatography is a technique for the separation of mixtures into its individual components.
A) Both assertion (A) and reason (R) are correct and (R) is the correct explanation of (A).
B) Assertion (A) is correct but reason (R) is incorrect.
C) Assertion (A) is incorrect but reason (R) is correct.
D) Both assertion (A) and reason (R) are correct but (R) is not correct explanation of (A).
Answer:
A) Both assertion (A) and reason (R) are correct and (R) is the correct explanation of (A).

Question 124.
Ink is a mixture of a dye in water. We can separate the components in the ink using evaporation. The correct observation in the experiment is
i) Water is separated in the form of vapour.
ii) Dye component doesn’t evaporate.
iii) Water and dye components gets evaporated.
iv) Dye components gets sublimated.
A) (i) and (ii)
B) (iii) only
C) (i) and (iv)
D) (i) only
Answer:
A) (i) and (ii)

Question 125.
On adding a piece of aluminium foil to blue coloured copper sulphate solution, copper will be deposited on aluminium foil. Then the solution
A) No change in colour
B) Becomes colourless
C) Turns to red
D) Turns to green
Answer:
B) Becomes colourless

Question 126.

Dispersion medium	Dispersed phase	Colloide type
gas	liquid	aerosol
liquid	x	sol
solid	liquid	gel

In the above table ‘x’ can be replaced
A) Liquid
B) Solid
C) Solid or liquid
D) Gas
Answer:
C) Solid or liquid

Question 127.
Element is a basic form of matter that cannot be broken down into simple forms by chemical reactions. If any substance can be separated into two or more constituent parts by a chemical reaction it should be
A) Mixture
B) Heterogeneous mixture
C) Homogeneous mixture
D) Compound
Answer:
D) Compound

Question 128.
Diesel – water is an immiscible mixture of solution. The diagram of apparatus is used to separate the mixture is

Answer:

Question 129.
The amount in gr mass of solute present in 100 gr mass of solution is called concentration. If 50 gr of salt in 200 gr of water, the concentration, of that solution would be
A) 25%
B) 10%
C) 50%
D) 20%
Answer:
D) 20%

Question 130.
In hot summer Revathi gave lemonade to the guests who visited her home. The solute in that solution is/are
i) Water
ii) Lemon juice
iii) Sugar
iv) Salt
A) (i) and (ii)
B) (iii) and (iv)
C) (ii), (iii) and (iv)
D) (i) only
Answer:
C) (ii), (iii) and (iv)

Question 131.
The components of a homogenous mixture are too intimately mixed up that it will be difficult to distinguish them from each other by visual observation. Example for such mixture is
A) Kerosene-water
B) Air
C) Naphthalein-water
D) Oil-water
Answer:
B) Air

Question 132.
Solubility is the measurement of amount of solute that dissolves in a solvent at a certain temperature. Factors that affect the solubility are
i) Temperature
ii) Size of the solute particles
iii) Stirring of a solution
A) (i) and (ii)
B) (ii) and (iii)
C) (i), (ii) and (iii)
D) (i) Only
Answer:
C) (i), (ii) and (iii)

Question 133.
Milk is
A) Suspension
B) Emulsion
C) Colloid
D) Gel
Answer:
C) Colloid

Question 134.
When we go through deep forest, the following effect can be observed
A) Photo electric effect
B) Raman effect
C) Tyndall effect
D) Comphton effect
Answer:
C) Tyndall effect

Question 135.
There must be following apparatus in chromotography laboratory activity
A) Thermometer
B) Litmus paper
C) Marker pen
D) Kerosene
Answer:
C) Marker pen

Question 136.
Which of the following is NOT a property of a mixture ?
A) They can formed from elements or compounds.
B) They have the properties of the constituent substances.
C) Their composition is always fixed.
D) They can be separated by physical methods.
Answer:
C) Their composition is always fixed.

Question 137.
A teaspoon of salt is mixed with a teaspoon of powdered camphor. Which of the following methods can be used to separate the camphor from this mixture ?
A) Distillation
B) Evaporation
C) Chromatography
D) Sublimation
Answer:
D) Sublimation

Question 138.
Which of the following is NOT a pure substance ?
A) Gold
B) Glucose
C) Milk
D) Water
Answer:
C) Milk

Question 139.
Take two test tubes, one filled with water and one with kerosene. Now add a spoon of salt in both and stir. You will observe that in the first test tube the salt dissolves completely and in the second test tube it does not dissolve. Which of the following is being tested using the above experiment ?
A) To identify which substance is pure substance and which is a mixture.
B) To identify which mixture is homogeneous and which is heterogeneous.
C) To identify if water and kerosene are a solute or a solvent.
D) To identify which is a saturated solution and which is an unsaturated solution.
Answer:
B) To identify which mixture is homogeneous and which is heterogeneous.

Question 140.
If the amount of the solute present is little for a given volume of solution, the solution is said to be dilute. If the amount of the solute present is more for a given volume of solution, the solution is said to be concentrated. Concentration is the mass of solute dissolved in the given volume of the solution.

Solution X contains 50 g of salt in 100g of water and solution Y contains 100g of salt in 200g of water.
Which of the following can be true based on the above information ?
A) Solution X has the same concentration as solution Y.
B) Solution X is more concentrated than solution Y.
C) Solution X is more dilute than solution Y.
D) Concentration of X cannot be compared with that of solution Y as their volumes are different.
Answer:
A) Solution X has the same concentration as solution Y.

Question 141.

i) Hydrogen	p) Suspension
ii) Water	q) Solution
iii) Lemonade	r) Element
iv) Cough Syrup	s) Compound

Choose the correct matching.
A) i – r, ii – s, iii – q, iv – p
B) i – s, ii – q, iii – p, iv – r
C) i – q, ii – p, iii – r, iv – s
D) i – p, ii – r, iii – s, iv – q
Answer:
A) i – r, ii – s, iii – q, iv – p

Question 142.
Which of the following cannot be separated by sublimation when it is mixed with Sand
A) Salt
B) Ammonium Chloride
C) Camphor
D) Iodine
Answer:
A) Salt

Question 143.
Ram : Salt is a compound.
Raj : Salt is a mixture. Who is correct ?
A) Ram
B) Raj
C) Both
D) None
Answer:
A) Ram

Question 144.
Kerosene and Caster oil are immisible liquids. To separate kerosene from caster oil ……………… is used typetype
A) Filter paper
B) Funnel
C) Separating funnel
D) Distillation apparatus
Answer:
D) Distillation apparatus

Question 145.
The method of separation of husk from wheat flour is called
A) Sieving
B) Handpicking
C) Filtration
D) Distillation
Answer:
A) Sieving

Question 146.
Sneha : A mixture has variable composition
Goutham : A compound has fixed composition
A) Sneha and Goutham are correct
B) Sneha and Goutham are incorrect
C) Sneha is correct, Goutham is incorrect
D) Sneha is incorrect, Goutham is correct
Answer:
A) Sneha and Goutham are correct

Question 147.
A solution contains 50g of common salt in 150g of water. Mass percentage of
solution is
A) 33.3%
B) 300%
C) 25%
D) 20%
Answer:
C) 25%

Question 148.
When a solid changes to directly gaseous state, the process is called
A) Diffusion
B) Sublimation
C) Evaporation
D) Boiling
Answer:
B) Sublimation

Question 149.
Which of the following shows Tyndall effect:
A) Shoe – polish
B) Salt water
C) Copper sulphate solution
D) Coffee
Answer:
A) Shoe – polish

Question 150.
Which of the following is not used in paper chromatography ?
A) Beaker
B) Separating funnel
C) Pencil
D) Marker Pen
Answer:
B) Separating funnel

Question 151.
P : Tyndall effect is related to suspensions
Q : Tyndall effect is related to colloidal solutions
A) P, Q are true
B) P, Q are false
C) P True, Q False
D) P false, Q True
Answer:
D) P false, Q True