Given below are the Class 9 Science CBSE Multiple Choice questions for Is Matter around us pure
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Air is regarded as a mixture because:
a)Its pressure may very
b)Its temperature may change
c)Its volume changes under different conditions
d)Its composition may vary
Question 2 .
Which of the following is a compound?
.The process used to separate oil and water is:
In which of the following the constituents are present in any ratio?
A mixture of common salt, sulphur, sand and iron filings is shaken with carbon disulphide and filtered through a filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in the dish after evaporation?
Two substances A and B when bought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. the substance C is:
d)None of the above
Camphor can be purified by:
Which one of the following will result in the formation of a mixture?
a)Crushing of a marble tile into small particles
b)Breaking of ice cubes into small pieces
c)Adding sodium metal to water
d)Adding milk in water
Purity of a solid substance can be checked by its:
c)Solubility in water
d)Solubility in alcohol
A mixture of ethanol and water ca be separated by:
Salt can be obtained from sea water by:
A sample contains two substances and has uniform properties. The sample is:
b)A heterogeneous mixture
d)A homogeeous mixture
A mixture of ZnCl2
can be separated by:
d)Adding acetic acid
A mixture of methyl alcohol and acetoe can be separated by:
d)Distillation under reduced pressure
Mixture of sand and sulphur may best be separated by:
a)Fractional crystallization from aqueous solution
d)Dissolving in CS2
Which component of the mixture ( Fe + S ) reacts with dil. HCI and gives hydrogen gas?
Which of the following is considered to be a pure substance?
d)Milk of magnesia
Physical properties of a mixture:
a)Vary with the amount of substance
b)Depend on the volume of the substance
c)Depend on the organization of the substance
d)Vary depending upon its components
a)Are the same as mixtures?
b)Can be separated by their physical properties
c)Contain only type of element
d)Are different kinds of atoms chemically combined with each other?
White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
a)They are homogeneous mixtures and be classified as metallic alloys.
b)The materials are heterogeneous mixtures and can be classified by their components.
c)The samples have variable compositions and are classified as metallic solutions.
d)The samples are heterogeneous mixtures that can be separated using magnetic properties.
To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use a:
Which of the following is an example of a heterogeneous substance?
c)Pieces of copper
Which of the following is an example of a homogeneous substance?
c)M& M candy
Which flow chart correctly describes a homogeneous material?
a)Unknown - density - 3 layers
b)Unknown – filtration – two substances
c)Unknown – magnet – two substances
d)Unknown – boiling – one temperature
A student is given a mixture of iron filings and sulphur in thee ratio 1 : 2 by weight. He was then asked to heat the mixture over a flame and to observe the olor change. The student will observe that the mixture becomes:
Filtration can be used to separate:
a)Solids from solids
b)Liquids from solids
c)Liquids from liquids
d)Liquids from gases
One common method used to separate dyes is:
Melting points can separate materials because:
a)Substances melt at different temperatures
b)Molecules vibrate rapidly when heated
c)Heat causes molecules to disintegrate
d)May substances fuse at the melting point
Distillation is a good separation technique for:
Solubility is a good separation technique for:
Magnetism is most beneficial for separating:
a)Gases and non- metallic liquids
b)Magnetic solids and solids such as sulfur
c)Non- metallic solids and solids such as sulfur
d)Non- magnetic solids from non- magnetic liquids
Before the heating when iron filing mixed with sulphur. Is this reaction will show chemical change:
c)Initially physical then chemical change
d)Initially chemical then physical change
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