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Class 9 Science
Is Matter Around Us Pure
Quiz 1
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Rusting of an article made up of iron is called
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corrosion and it is a physical as well as chemical change
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dissolution and it is a physical change
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corrosion and it is a chemical change
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dissolution and it is a chemical change
Explanation
corrosion and it is a chemical change
A mixture of sulphur and carbon disulphide is
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heterogeneous and shows Tyndall effect
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homogeneous and shows Tyndall effect
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heterogeneous and does not show Tyndall effect
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homogeneous and does not show Tyndall effect
Explanation
homogeneous and does not show Tyndall effect
Tincture of iodine has antiseptic properties. This solution is made by dissolving
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iodine in potassium iodide
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iodine in vaseline
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iodine in water
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iodine in alcohol
Explanation
iodine in alcohol
Blood and sea water are
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both mixtures
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both are compounds
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blood is a mixture whereas sea water is a compound
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blood is a compound and sea water is a mixture
Explanation
both mixtures
Sol and gel are examples of
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Solid-solid colloids
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Sol is a solid-liquid colloid and gel is liquid solid colloid
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Sol is solid-solid colloid and gel is solid-liquid colloid
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Sol is a liquid-solid colloid and gel is a solid-liquid colloid
Explanation
Sol is a solid-liquid colloid and gel is liquid solid colloid
In a water-sugar solution
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water is solute and sugar is solvent
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water is solvent and sugar is solute
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water is solute and water is also solvent
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none of these
Explanation
water is solvent and sugar is solute
Boron and carbon are
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metalloids
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metalloid and non-metal respectively
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metal
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non-metal and metalloid respectively
Explanation
metalloid and non-metal respectively
Which of the following methods would you use to separate cream from milk?
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Fractional distillation
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Distillation
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Centrifugation
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Filtration
Explanation
Centrifugation
Cooking of food and digestion of food:
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are both physical processes
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are both chemical processes
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cooking is physical whereas digestion is chemical
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cooking is chemical whereas digestion is physical
Explanation
are both chemical processes
Mercury and bromine are both
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liquid at room temperature
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solid at room temperature
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gases at room temperature
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both (a) and (b)
Explanation
liquid at room temperature
Mixture of sand and sulphur may best be separated by:
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Fractional distillation
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Magnetic method
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Dissolving in \(CS_2\) and filtering
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Fractional crystallization from aqueous solution
Filtration can be used to separate:
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Solids from solids
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Liquids from liquids
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Liquids from solids
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Liquids from gases
Which flow chart correctly describes a homogeneous material?
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Unknown – filtration – two substances
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Unknown - density - 3 layers
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Unknown – boiling – one temperature
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Unknown – magnet – two substances
Solubility is a good separation technique for:
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Pure metals
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Different salts
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Noble gases
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Metallic alloys
A mixture of ethanol and water can be separated by:
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Sublimation
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Filtration
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Fractional distillation
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Decantation
Which of the following is an example of a heterogeneous substance?
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Pieces of copper
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Candle
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Bottled water
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Table salt
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:
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Orange
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Black
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Yellow
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Grey
Physical properties of a mixture:
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Depend on the volume of the substance
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Depend on the organization of the substance
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Vary with the amount of substance
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Vary depending upon its components
Which of the following is an example of a homogeneous substance?
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Copper sulphate
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Gems candy
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Granite
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Muddy water
A mixture of methyl alcohol and acetone can be separated by:
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Steam distillation
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Distillation under reduced pressure
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Fractional distillation
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Distillation
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