Rusting of an article made up of iron is called
  • corrosion and it is a physical as well as chemical change
  • dissolution and it is a physical change
  • corrosion and it is a chemical change
  • dissolution and it is a chemical change
A mixture of sulphur and carbon disulphide is
  • heterogeneous and shows Tyndall effect
  • homogeneous and shows Tyndall effect
  • heterogeneous and does not show Tyndall effect
  • homogeneous and does not show Tyndall effect
Tincture of iodine has antiseptic properties. This solution is made by dissolving
  • iodine in potassium iodide
  • iodine in vaseline
  • iodine in water
  • iodine in alcohol
Blood and sea water are
  • both mixtures
  • both are compounds
  • blood is a mixture whereas sea water is a compound
  • blood is a compound and sea water is a mixture
Sol and gel are examples of
  • Solid-solid colloids
  • Sol is a solid-liquid colloid and gel is liquid solid colloid
  • Sol is solid-solid colloid and gel is solid-liquid colloid
  • Sol is a liquid-solid colloid and gel is a solid-liquid colloid
In a water-sugar solution
  • water is solute and sugar is solvent
  • water is solvent and sugar is solute
  • water is solute and water is also solvent
  • none of these
Boron and carbon are
  • metalloids
  • metalloid and non-metal respectively
  • metal
  • non-metal and metalloid respectively
Which of the following methods would you use to separate cream from milk?
  • Fractional distillation
  • Distillation
  • Centrifugation
  • Filtration
Cooking of food and digestion of food:
  • are both physical processes
  • are both chemical processes
  • cooking is physical whereas digestion is chemical
  • cooking is chemical whereas digestion is physical
Mercury and bromine are both
  • liquid at room temperature
  • solid at room temperature
  • gases at room temperature
  • both (a) and (b)
Mixture of sand and sulphur may best be separated by:
  • Fractional distillation
  • Magnetic method
  • Dissolving in \(CS_2\) and filtering
  • Fractional crystallization from aqueous solution
Filtration can be used to separate:
  • Solids from solids
  • Liquids from liquids
  • Liquids from solids
  • Liquids from gases
Which flow chart correctly describes a homogeneous material?
  • Unknown – filtration – two substances
  • Unknown - density - 3 layers
  • Unknown – boiling – one temperature
  • Unknown – magnet – two substances
Solubility is a good separation technique for:
  • Pure metals
  • Different salts
  • Noble gases
  • Metallic alloys
A mixture of ethanol and water can be separated by:
  • Sublimation
  • Filtration
  • Fractional distillation
  • Decantation
Which of the following is an example of a heterogeneous substance?
  • Pieces of copper
  • Candle
  • Bottled water
  • 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:
  • Orange
  • Black
  • Yellow
  • Grey
Physical properties of a mixture:
  • Depend on the volume of the substance
  • Depend on the organization of the substance
  • Vary with the amount of substance
  • Vary depending upon its components
Which of the following is an example of a homogeneous substance?
  • Copper sulphate
  • Gems candy
  • Granite
  • Muddy water
A mixture of methyl alcohol and acetone can be separated by:
  • Steam distillation
  • Distillation under reduced pressure
  • Fractional distillation
  • Distillation
Which one of the following will result in the formation of a mixture?
  • Adding milk in water
  • Breaking of ice cubes into small pieces
  • Adding sodium metal to water
  • 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?
  • Iron filings
  • Sand
  • Common salt
  • Sulphur
Camphor can be purified by:
  • Sedimentation
  • Sublimation
  • Distillation
  • Filtration
A sample contains two substances and has uniform properties. The sample is:
  • A heterogeneous mixture
  • An element
  • A homogeeous mixture
  • A compound
Melting points can separate materials because:
  • May substances fuse at the melting point
  • Molecules vibrate rapidly when heated
  • Substances melt at different temperatures
  • Heat causes molecules to disintegrate
One common method used to separate dyes is:
  • Filtration
  • Chromatography
  • Distillation
  • Conductivity
Magnetism is most beneficial for separating:
  • Non- magnetic solids from non- magnetic liquids
  • Gases and non- metallic liquids
  • Non- metallic solids and solids such as sulfur
  • 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:
  • Watch glass
  • China dish
  • Petri dish
  • Copper dish
Before the heating when iron filing mixed with sulphur. Is this reaction will show chemical change:
  • yes
  • no
  • Initially physical than chemical change
  • Initially chemical than physical change
Purity of a solid substance can be checked by its:
  • Solubility in alcohol
  • Boiling point
  • Melting point
  • Solubility in water
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