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Class 9 Science
Is Matter Around Us Pure
Quiz 2
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Which one of the following will result in the formation of a mixture?
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Adding milk in water
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Breaking of ice cubes into small pieces
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Adding sodium metal to water
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Crushing of a marble tile into small particles
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?
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Iron filings
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Sand
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Common salt
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Sulphur
Camphor can be purified by:
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Sedimentation
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Sublimation
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Distillation
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Filtration
A sample contains two substances and has uniform properties. The sample is:
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A heterogeneous mixture
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An element
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A homogeeous mixture
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A compound
Melting points can separate materials because:
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May substances fuse at the melting point
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Molecules vibrate rapidly when heated
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Substances melt at different temperatures
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Heat causes molecules to disintegrate
One common method used to separate dyes is:
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Filtration
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Chromatography
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Distillation
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Conductivity
Magnetism is most beneficial for separating:
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Non- magnetic solids from non- magnetic liquids
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Gases and non- metallic liquids
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Non- metallic solids and solids such as sulfur
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Magnetic solids and solids such as sulfur
To prepare iron sulphide, by heating a mixture of iron filings and sulphur powder, we should use a:
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Watch glass
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China dish
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Petri dish
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Copper dish
Before the heating when iron filing mixed with sulphur. Is this reaction will show chemical change:
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yes
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no
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Initially physical than chemical change
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Initially chemical than physical change
Purity of a solid substance can be checked by its:
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Solubility in alcohol
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Boiling point
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Melting point
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Solubility in water
The process used to separate oil and water is:
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Distillation
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Separating funnel
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chromatography
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Sublimation
In which of the following the constituents are present in any ratio?
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Mixture
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Colloid
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Solution
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Compound
Salt can be obtained from sea water by:
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Decantation
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Evaporation
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Sublimation
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Filtration
Which of the following is considered to be a pure substance?
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Granite
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Milk of magnesia
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Muddy water
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Sodium chloride
Which of the following is a compound?
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Graphite
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Hydrogen sulphide
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Bronze
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Stainless steel
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?
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They are homogeneous mixtures and be classified as metallic alloys.
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The samples are heterogeneous mixtures that can be separated using magnetic properties.
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The materials are heterogeneous mixtures and can be classified by their components.
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The samples have variable compositions and are classified as metallic solutions.
Distillation is a good separation technique for:
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Solids
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Gases
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Solid alloys
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Liquids
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:
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None of these
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An element
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A mixture
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A compound
Air is regarded as a mixture because:
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It's temperature may change
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Its composition may vary
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It's pressure may very
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Its volume changes under different conditions
A mixture of ZnCl2 and PbCl2 can be separated by:
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Adding acetic acid
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Sublimation
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Crystallization
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Distillation
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