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WorksheetsIs Matter Around Us Pure ?
Total questions: 24
Worksheet time: 13mins
What Happens to the vapours of the liquid in fractionating column ?
Condense
Solidify
Cool
Both 1 & 3
What type of solution is required for crystallizaton ?
Unsaturated
Super saturated
Diluted
None of the above
The amount of solute present per unit volume or per unit mass of the solution/solvent is known as ___________ .
Composition of solution
Concentration of a solution
Concentration of solvent
Concentration of solute
Which of the following non-metal is not a good conductor of electricity ?
Silicon
Graphite
Chlorine
Gold
Which of the following elements is not a metalloid?
Tungsten
Boron
Silicon
Germanium
Which separation technique is shown in the picture ?
Distillation
Evaporation
Crystallization
Both 2 & 3
Which of the following is an example of heterogeneous mixture ? (two or more options might be correct)
Bottled water
Table salt
Pieces of copper
Candle
Brass is an alloy of molten Copper in ___________ .
solid Zinc
molten Zinc
gaseous Zinc
molten Tin
Air is regarded as a mixture because __________ .(two or more options might be correct)
its pressure may vary
its temperature may change
its composition may vary
its volume changes under different conditions
In which of the following the constituents can be present in any ratio ?(two or more options might be correct)
Compound
Suspension
Colloid
Mixture
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?
Sand
Iron
Sulphur
Common Salt
Carbon Disulphide
Arsenic can be purified by ?
Sublimation
Distillation
Chromatography
Crystallization
What are the boiling points of Alcohol and Water ?
Alcohol = 79C, Water = 100C
Alcohol = 78C, Water = 200C
Alcohol = 79C, Water = 200C
Alcohol = 78C, Water = 100C
What is a Solution ?
A homogeneous mixture of two or more chemically non-reacting substances
A homogeneous mixture of two or more chemically reacting substances
Which of the following is an non-aqueous solution ?(two or more options might be correct)
Salt water
Brass
Ethanol
Dilute HCl
The solubility of a salt in water is 20g/100g at 25C. It increases 10% for every 5C rise of temperature upto 50C and then becomes constant. A solution of 26g of the same salt in 100g of water at 35C would be
Saturated
unsaturated
translucent
colloidal
What is the state of the solute and solvent in solution of hydrogen and palladium ?
Solute = Gas, Solvent = Solid
Solute = Solid, Solvent = Gas
Solute = Gas, Solvent = Liquid
Solute = Liquid, Solvent = Gas
What is the size of particle in a colloid ?
1nm - 1000nm
10nm - 100nm
1nm - 100nm
10nm - 1000nm
Which of the following is an Aerosol ?(two or more options might be correct)
Fog
Foam
Shaving Cream
Rubber
What is an Emulsion ?
Colloid fromed when Solid is mixed in liquid
Colloid fromed when Liquid is mixed in gas
Colloid fromed when Liquid is mixed in liquid
Colloid fromed when Gas is mixed in gas
What are the 2 components of a colloid ?
Dispersed phase and dispersion medium
Dispersed phase and solvent
Solute and Solvent
Solute and dispersion medium
What is the volume of solution in which mass of solute = 50g and mass by volume percentage of the solution = 50%
100ml
10ml
1000ml
200ml
Which of the following is a physical change ?
Electric current is passed through water
Electric current is passed through a bulb and it glows
Burning of candle
Making of curd from milk
When a ray of light passes through a solution and it is not visible, then the solution has
particles smaller than 10^-9 m in diameter
particles are of a colloid
particles are of a suspension
particles of the order of 10^-7 m in diameter
