Separation of mixtures – Techniques
MULTIPLE CHOICE QUESTIONS ON SEPARATION TECHNIQUES
FITRATION
1)The component left behind on the filter paper is:
Answer: residue
2)The component collected in the flask is:
Answer: filtrate
3)Filtration can be used to separate:
Answer: insoluble solid and liquid
4)Filtration works on the principle of separation based on:
Answer: size of particles
5)Filtration can be used to separate:
Answer: coffee powder from coffee
6) Filtration can be used to separate:
Answer: sand and water
DISTILLATION
1)The method shown above is:
Answer: distillation
2)The liquid collected from condensed vapours is called:
Answer: distillate
3)Distillation involves:
Answer: evaporation and condensation
4)Distillation is used to separate:
Answer: liquids with different boiling points
5)Distillation can be used to separate solute from solvent:
Answer: true
6) Distillation can be used to obtain:
Answer: pure water from sea water
SEPARATING FUNNEL
1)The method shown is used for separation of:
Answer: immiscible liquids
2)In the figure the yellow coloured liquid is:
Answer: lighter liquid
3)In this method separation is based on principle of difference in:
Answer: density
4)This method can be used for separation of:
Answer: oil from water
5)This method cannot be used for separation of:
Answer: alcohol and water
6) Which of the following mixtures can be separated using a separating funnel?
Answer: water and kerosene
SUBLIMATION
1)Sublimate is collected on:
Answer: inverted funnel
2)Sublimation can be used to separate:
Answer: iodine and sand
3)Which of these is required in sublimation:
Answer: funnel
4)Sublimation cannot be used to separate:
Answer: iodine and camphor
5)Example of two sublimating substances are:
Answer: camphor and ammonium chloride
6) The reverse process of sublimation is:
Answer: Deposition
CHROMATOGRAPHY
1)In the above figure the stationery phase is:
Answer: paper
2)In the above figure the mobile phase is:
Answer: solvent
3)This method of separation is based on the difference in:
Answer: solubility
4)Chromatography can be used to determine purity of a substance:
Answer: True
5)In chromatography, the component which has lower solubility appears at:
Answer: bottom of paper
6) In chromatography, the mobile phase can be:
Answer: solvent or gas
FRACTIONAL DISTILLATION
1)This method of separation is based on the difference in:
Answer: boiling points
2)Fractional distillation is used for the separation of:
Answer: crude oil
3)Fractional distillation is used to separate:
Answer: miscible liquids
4)Fractional distillation is used to separate miscible liquids with boiling point difference:
Answer: less than 25oC
5)Fractional distillation differs from simple distillation in:
Answer: height of distillation column
6) Fractional distillation is used to separate:
Answer: methanol and ethanol
CENTRIFUGATION
1)Centrifugation method can be used to separate:
Answer: cream from skim milk
2)Particles separate during centrifugation based on?
Answer: their density and size
3)If muddy water is placed in a centrifuge machine:
Answer: mud particles will settle at the bottom
4)If milk is placed in a centrifuge machine you will see:
Answer: cream on top and skim milk at bottom
5)Which force is responsible for separation in a centrifuge?
Answer: Centrifugal force
6)Which of the following can be separated using a centrifuge?
Answer: Blood cells from blood plasma
MULTIPLE CHOICE QUESTIONS ON MIXTURE SEPARATIONS
1) Which is the correct sequence for separation of a mixture of alcohol, sugar, water and oil?
Answer: Separating funnel, fractional distillation and evaporation
2) What will be correct order of steps to separate a mixture of sawdust, sugar, water and coconut oil?
Answer: Filtration, separating funnel and evaporation
3)To separate the components of a mixture of sand, common salt and camphor, the correct sequence is:
Answer: Sublimation, dissolving in water, filtration and evaporation
4) What is the order of methods applied to separate the components of a mixture of salt, sand and ammonium chloride?
Answer: Sublimation, dissolving in water, filtration and evaporation
5) A mixture consists of salt, chalk and ammonium chloride. The substance that should be separated first will be:
Answer: Ammonium chloride
6) What will be the order of methods you will use to separate a mixture of iodine, salt and sand?
Answer: Sublimation adding water, filtration and evaporation
7) Which is the correct sequence for separation of a mixture of sand, diesel oil, kerosene oil and water?
Answer: Filtration, separating funnel and fractional distillation
8) Which is the correct sequence for separation of a mixture of ammonium chloride, charcoal, and salt?
Answer: Sublimation, adding water, filtration and distillation
9) One cup each of rice, coconut oil and salt got mixed by mistake. How will you separate this mixture to recover the components?
Answer: Adding water, filtration, separating funnel and evaporation
10) A mixture of oats, sugar and cashew nuts has to be separated. What will be the order of steps taken?
Answer: Handpicking, adding water, filtration and evaporation
11) What will be correct order of steps to separate a mixture of water, kerosene, sand and fine clay?
Answer: Filtration, centrifugation and separating funnel
12) What will be correct order of steps to separate a mixture of water, salt, sand and fine chalk powder?
Answer: ;Filtration, centrifugation ;and distillation