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
The process used to separate oil and water is:
  • Distillation
  • Separating funnel
  • chromatography
  • Sublimation
In which of the following the constituents are present in any ratio?
  • Mixture
  • Colloid
  • Solution
  • Compound
Salt can be obtained from sea water by:
  • Decantation
  • Evaporation
  • Sublimation
  • Filtration
Which of the following is considered to be a pure substance?
  • Granite
  • Milk of magnesia
  • Muddy water
  • Sodium chloride
Which of the following is a compound?
  • Graphite
  • Hydrogen sulphide
  • Bronze
  • 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?
  • They are homogeneous mixtures and be classified as metallic alloys.
  • The samples are heterogeneous mixtures that can be separated using magnetic properties.
  • The materials are heterogeneous mixtures and can be classified by their components.
  • The samples have variable compositions and are classified as metallic solutions.
Distillation is a good separation technique for:
  • Solids
  • Gases
  • Solid alloys
  • 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:
  • None of these
  • An element
  • A mixture
  • A compound
Air is regarded as a mixture because:
  • It's temperature may change
  • Its composition may vary
  • It's pressure may very
  • Its volume changes under different conditions
A mixture of ZnCl2 and PbCl2 can be separated by:
  • Adding acetic acid
  • Sublimation
  • Crystallization
  • Distillation
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