The constituents of a pure substance cannot be separated by physical methods.
True
False
Pure substance has definite set of properties.
True
False
The properties of water are different from its constituent elements.
True
False
A mixture has fixed melting and boiling points.
True
False
The constituents of heterogeneous mixtures are not clearly visible and cannot be identified individually.
True
False
Mixture is a combination of impure substances.
True
False
The techniques used for separating mixtures rely on the differences in the chemical properties of the components.
True
False
The basis of separation of a mixture is the fact that each component has different physical and chemical properties.
True
False
The vapour of the liquid having a lower boiling point rise to the top of the fractionating column whereas the vapour of the liquid having a higher boiling point condenses at the bottom of the fractionating column.
True
False
Click the correct answer.
We can obtain pure sugar from its solution in water by which of the following methods?
Crystallisation
Evaporation
Fractional crystallisation
Sublimation
Which of the following can be separated by solvent extraction?
Sodium chloride and calcium carbonate
Oil and water
Alcohol and water
Copper sulphate crystals from copper sulphate solution.
Which of the following is mixed with pulverised ore in a tank?
Pine oil, sodium xanthate (or potassium xanthate) and water
Pine oil, calcium ethyl xanthate (or potassium ethyl xanthate) and water
Pine oil, sodium ethyl xanthate (or potassium ethyl xanthate) and water
Olive oil, sodium ethyl xanthate (or potassium ethyl xanthate) and water
What is gangue?
Impure water
Muddy impurities
Zinc blende
Galena
Which of the following is an ore of zinc?
Galena
Gangue
Xanthate
Zinc blende
Which of the following cannot sublime?
Iodine
Camphor
Ammonium sulphate
Ammonium chloride
Choose the correct statement.
Solubility of potassium nitrate is more than solubility of sodium chloride in oil.
Solubility of sodium chloride is more than solubility of potassium nitrate in water.
Solubility of sodium nitrate is more than solubility of potassium chloride in oil.
Solubility of potassium nitrate is more than solubility of sodium chloride in water.
We can separate a mixture of common salt and potassium nitrate by which of the following methods?
Fractional crystallisation
Crystallization
Distillation
Sublimation
Click each box on the left and then click the matching box on the right.
