Separation Of Substances Worksheet

Objective Type Questions

1. Match the separation techniques in Column A with appropriate separation processes in column B:
   

   	(Column A)		(Column B)
   i	Evaporation	a	Separation of tea leaves from boiled tea.
   ii	Decantation	b	Separation of onions from potatoes
   iii	Filtration	c	Separation of oil from water
   iv	Winnowing	d	Separation of salt from seawater
   v	Handpicking	e	Separation of grains from husk

    
2. State whether the following statements are true or false. In case of false statement, write the correct one.
   (i) Iron powder mixed with flour is separated by sieving.
   (a) True
   (b) False
   (ii) Lady’s finger mixed with beans is separated by winnowing.
   (a) True
   (b) False
   
   
3. Name the following:
   (a) The process of removing upper layer of water from a heterogeneous mixture slowly.
   (b) The process of conversion of water vapour into liquid water.
   
   
4. Find the odd one out:
   • Mixture of chalk powder and water,
   • Mixture of sugar and water,
   • Mixture of sand and water,
   • Mixture of oil and water.
   
   
5. Solve the following crossword based on “Methods of Separation of Mixtures”:
   Down:
   (a) The process of turning water into vapour
   (b) The process separating grains from stalks
   (c) The process of naturally allowing insoluble solid to settle down
   (d) The process of separating chalk powder from water
   Across:
   (c) The process of separating impurities like bran from flour
   (e) The process of separating small pieces of stones from pulses, rice
   (f) The process of separating liquid from insoluble solid and other immiscible liquids, by removing the upper liquid layer.
   (g) The process of separating chaff is separated from grain.
   
   Multiple Choice Questions
   
   
6. Observe below image and suggest a method of separation.
   
   (a) Winnowing
   (b) Threshing
   (c) Sieving
   (d) Sedimentation
   
   
7. Teacher asked Meenal to separate a mixture of salt, sand and water. Which of the below options explain the stepwise processes required to get back all the three components separated?
   (a) Evaporation to obtain sand, filtration to get salt, condensation to obtain water
   (b) Filtration to get salt, condensation to get water, evaporation to remove sand
   (c) Evaporation to get salt, filtration to remove sand, condensation to get back water
   (d) Filtration to remove sand, evaporation to get salt, condensation to get back water
   
   
8. Lata's mother assigned her the task of washing rice for cooking. Lata added water to the bowl of rice and properly stirred it. She noticed that all of the dust particles had risen to the surface of the water, while the rice was settling. Which of the following separation procedures would be most helpful in removing dust particles?
   (a) Decantation and condensation
   (b) Filtration and evaporation
   (c) Sedimentation and decantation
   (d) Sedimentation and filtration
   
   
9. Shraddha’s father brought cauliflower, beans, tomatoes, oranges and limes from the market in a single cotton bag to avoid plastic bags. He asked Shraddha to help her mother keep it in the refrigerator properly. Her parents taught her to wash and dry all vegetables and fruits thoroughly before putting them in mini-cotton bags and storing them in the refrigerator. To do all these steps, she first had to separate all the vegetables and fruits. Which of the below separation method would be useful to do so and why?
   (a) Handpicking because all the vegetables and fruits have different size
   (b) Sieving because all the vegetables and fruits have different size
   (c) Sedimentation because all the vegetables and fruits have different weights
   (d) All the above three methods stepwise.
   
   
10. Kushal was asked to separate the beads collected in a glass? Based on what property these beads can be separated?
    
    (a) On the basis of shape
    (b) On the basis of size
    (c) On the basis of colour
    (d) On the basis of weight
    
    
11. Which of the following mixture would require below apparatus for separation?
    
    (a) Copper chips and sulphur powder
    (b) Marbles and sand
    (c) Steel nails and iron nails
    (d) Steel nails and sulphur powder
    
    
12. Now-a-days Ganpati visrajan is performed in artificial ponds to avoid pollution of natural water reservoirs. Which of the following would be the most appropriate method
    
    for separation of clay and water?
    (a) Sedimentation and evaporation
    (b) Sedimentation and filtration
    (c) Filtration and evaporation
    (d) Decantation and condensation
    
    Case-Based Questions
    
    
13. Many substances dissolve in water and form a solution. These substances are soluble in water. Shravan was instructed to do as follows:
    I. Mix two teaspoons of solid salt with some liquid water in a beaker.
    II. Stir it well. When he stirred it, he discovered that all of the salt had vanished, leaving only liquid in the beaker.
    III. He was again asked to add few more teaspoons of salt in the same mixture and stir. He could see some salt undissolved.
    IV. Heat the mixture formed in step III.
    V. Cool the mixture formed in step IV.
    (a) The liquid contained in the beaker at the end of procedure in step I:
    A. Water
    B. Solute
    C. Solvent
    D. Solution
    (b) Which of the following methods will be most effective in extracting salt from the mixture prepared in step I?
    A. Evaporation
    B. Filtration
    C. Condensation
    D. Sedimentation
    (c) Which method can be used to get liquid water from water vapours collected in another container?
    A. Filtration
    B. Sedimentation
    C. Condensation
    D. Evaporation
    (d) What is the mixture formed in step III called? What will be the effect of heating on this mixture formed in step III?
    (e) What would happen if the mixture formed in step IV is allowed to cool? Name the phenomenon.
    
    Subjective Questions
    
    
14. On a vacation to her hometown, Kartiki noticed her uncles performing specific tasks in their farm, as shown in the photograph below. She was interested as to what they were up to. Can you explain this task and the underlying principle?
    
15. Justify: Sugar is added to water before ice cubes while making chilled lemonade juice.
    
16. Match the separation process mentioned in column A with the purpose of separation in column B and the treatment with separated components in column C.
    

    	Column A		Column B		Column C
    Type	Separation process		Purpose of separation		Treatment with separated components
    I	Churning of buttermilk	(a)	To remove solid not -useful component	(i)	We throw away the solid components.
    II	Separation of stones from millets	(b)	To separate two different but useful components	(ii)	We use both the components
    III	Separation of tea powder from boiled tea	(c)	To remove harmful impurities	(iii)	We throw away the harmful impurities.

     
    Also, suggest the type with which the below mentioned separation process would fit:
    Separation of salt from water.
    
    Assertion Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
    
17. Assertion (A): Evaporation can be used to separate homogenous liquid mixture.
    Reason (R): Evaporation is the process in which liquid gets converted into vapour.
    
    
18. Assertion (A): Sand can be separated from water by filtration.
    Reason (R): Sand and water makes heterogeneous mixture.
    
    
19. Assertion (A): Pebbles and stones are removed from sand by sieving.
    Reason (R): Sieving allows the fine particles to pass through the holes of the sieve while the bigger impurities remain on the sieve.
    
    
20. Assertion (A): The mixture of water and sand is separated by sedimentation.
    Reason (R): The process of conversion of liquid water into water vapour is called evaporation.

Objective Type Questions

1. Match the separation techniques in Column A with appropriate separation processes in column B:
   

   	(Column A)		(Column B)
   i	Evaporation	a	Separation of tea leaves from boiled tea.
   ii	Decantation	b	Separation of onions from potatoes
   iii	Filtration	c	Separation of oil from water
   iv	Winnowing	d	Separation of salt from seawater
   v	Handpicking	e	Separation of grains from husk

    
   Solution:
   

   	(Column A)		(Column B)
   i	Evaporation	d	Separation of salt from seawater
   ii	Decantation	c	Separation of oil from water
   iii	Filtration	a	Separation of tea leaves from boiled tea.
   iv	Winnowing	e	Separation of grains from husk
   v	Handpicking	b	Separation of onions from potatoes

    
2. State whether the following statements are true or false. In case of false statement, write the correct one.
   (i) Iron powder mixed with flour is separated by sieving.
   (a) True
   (b) False
   (ii) Lady’s finger mixed with beans is separated by winnowing.
   (a) True
   (b) False
   
   (i) Correct option: (b) False.
   Solution: Iron powder mixed with flour is separated by using a magnet.
   (ii) Correct option: (b) False
   Solution: Lady’s finger mixed with beans is separated by handpicking method of separation.
   
   
3. Name the following:
   (a) The process of removing upper layer of water from a heterogeneous mixture slowly.
   (b) The process of conversion of water vapour into liquid water.
   
   Solution:
   (a) Decantation
   (b) Condensation
   
   
4. Find the odd one out:
   • Mixture of chalk powder and water,
   • Mixture of sugar and water,
   • Mixture of sand and water,
   • Mixture of oil and water.
   
   Solution:
   Mixture of sugar and water
   Only mixture of sugar and water is homogeneous mixture and all other three are examples of heterogeneous mixture.
   
   
5. Solve the following crossword based on “Methods of Separation of Mixtures”:
   Down:
   (a) The process of turning water into vapour
   (b) The process separating grains from stalks
   (c) The process of naturally allowing insoluble solid to settle down
   (d) The process of separating chalk powder from water
   Across:
   (c) The process of separating impurities like bran from flour
   (e) The process of separating small pieces of stones from pulses, rice
   (f) The process of separating liquid from insoluble solid and other immiscible liquids, by removing the upper liquid layer.
   (g) The process of separating chaff is separated from grain.
   
   Solution:
   
   Multiple Choice Questions
   
   
6. Observe below image and suggest a method of separation.
   
   (a) Winnowing
   (b) Threshing
   (c) Sieving
   (d) Sedimentation
   
   Correct option: (b) Threshing
   Solution: The process that is used to separate grain from stalks etc. is called threshing. In this process, the harder stalks are beaten to free the lighter grain seeds.
   
   
7. Teacher asked Meenal to separate a mixture of salt, sand and water. Which of the below options explain the stepwise processes required to get back all the three components separated?
   (a) Evaporation to obtain sand, filtration to get salt, condensation to obtain water
   (b) Filtration to get salt, condensation to get water, evaporation to remove sand
   (c) Evaporation to get salt, filtration to remove sand, condensation to get back water
   (d) Filtration to remove sand, evaporation to get salt, condensation to get back water
   
   Correct option: (d)  Filtration to remove sand, evaporation to get salt, condensation to get back water
   Solution: First step is to remove sand particles by filtration. Sand particles get stuck on the filter paper while we get clean homogeneous mixture of salt and water in the beaker. Evaporation help to get salt in the evaporating dish while condensation of collected water vapours give back water.
   
   
8. Lata's mother assigned her the task of washing rice for cooking. Lata added water to the bowl of rice and properly stirred it. She noticed that all of the dust particles had risen to the surface of the water, while the rice was settling. Which of the following separation procedures would be most helpful in removing dust particles?
   (a) Decantation and condensation
   (b) Filtration and evaporation
   (c) Sedimentation and decantation
   (d) Sedimentation and filtration
   
   Correct option: (c) Sedimentation and decantation
   Solution: Rice settles down naturally by the force of gravity is the process of sedimentation. Once all the rice settles down properly, water can be slowly decanted along with the dust particles that have risen.
   
   
9. Shraddha’s father brought cauliflower, beans, tomatoes, oranges and limes from the market in a single cotton bag to avoid plastic bags. He asked Shraddha to help her mother keep it in the refrigerator properly. Her parents taught her to wash and dry all vegetables and fruits thoroughly before putting them in mini-cotton bags and storing them in the refrigerator. To do all these steps, she first had to separate all the vegetables and fruits. Which of the below separation method would be useful to do so and why?
   (a) Handpicking because all the vegetables and fruits have different size
   (b) Sieving because all the vegetables and fruits have different size
   (c) Sedimentation because all the vegetables and fruits have different weights
   (d) All the above three methods stepwise.
   
   Correct option: (a) Handpicking because all the vegetables and fruits have different size
   Solution: Handpicking is used to separate things that are somewhat larger in size. The number of such things is often small. The size of vegetables and fruits varies. They are big in terms of size but not in terms of quantity. Handpicking is a practical way to separate them.
   
   
10. Kushal was asked to separate the beads collected in a glass? Based on what property these beads can be separated?
    
    (a) On the basis of shape
    (b) On the basis of size
    (c) On the basis of colour
    (d) On the basis of weight
    
    Correct option: (c) On the basis of colour
    Solution: The beads have similar size, shape and weight but different colours.
    
    
11. Which of the following mixture would require below apparatus for separation?
    
    (a) Copper chips and sulphur powder
    (b) Marbles and sand
    (c) Steel nails and iron nails
    (d) Steel nails and sulphur powder
    
    Correct option: (d) Steel nails and sulphur powder
    Solution: Steel nails have iron content in it which gets attracted towards magnet and can be separated from sulphur powder easily.
    
    
12. Now-a-days Ganpati visrajan is performed in artificial ponds to avoid pollution of natural water reservoirs. Which of the following would be the most appropriate method
    
    for separation of clay and water?
    (a) Sedimentation and evaporation
    (b) Sedimentation and filtration
    (c) Filtration and evaporation
    (d) Decantation and condensation
    
    Correct option: (b) Sedimentation and filtration
    Solution: The sedimentation process gradually settles the clay. Water can be removed, and small particles that are still floating in the water can be removed through filtering.
    
    Case-Based Questions
    
    
13. Many substances dissolve in water and form a solution. These substances are soluble in water. Shravan was instructed to do as follows:
    I. Mix two teaspoons of solid salt with some liquid water in a beaker.
    II. Stir it well. When he stirred it, he discovered that all of the salt had vanished, leaving only liquid in the beaker.
    III. He was again asked to add few more teaspoons of salt in the same mixture and stir. He could see some salt undissolved.
    IV. Heat the mixture formed in step III.
    V. Cool the mixture formed in step IV.
    (a) The liquid contained in the beaker at the end of procedure in step I:
    A. Water
    B. Solute
    C. Solvent
    D. Solution
    (b) Which of the following methods will be most effective in extracting salt from the mixture prepared in step I?
    A. Evaporation
    B. Filtration
    C. Condensation
    D. Sedimentation
    (c) Which method can be used to get liquid water from water vapours collected in another container?
    A. Filtration
    B. Sedimentation
    C. Condensation
    D. Evaporation
    (d) What is the mixture formed in step III called? What will be the effect of heating on this mixture formed in step III?
    (e) What would happen if the mixture formed in step IV is allowed to cool? Name the phenomenon.
    
    Solution:
    (a) Correct option: (D) Solution
    Solution: The homogeneous mixture of salt and water is called solution.
    (b) Correct option: (A) Evaporation
    Solution: Evaporation is the method used to extract solute dissolved in homogeneous mixture with water.
    (c) Correct option: (C) Condensation
    Solution: Condensation is the process in which water vapours get cooled to form liquid water.
    (d) The mixture formed in step III is called saturated solution. On heating the mixture formed in step III, the undissolved salt will start getting dissolved to form homogeneous mixture.
    (e) On cooling the solution formed in step IV, the extra salt which got dissolved due to heating will start reappearing as crystals. This phenomenon is termed as crystallisation
    
    Subjective Questions
    
    
14. On a vacation to her hometown, Kartiki noticed her uncles performing specific tasks in their farm, as shown in the photograph below. She was interested as to what they were up to. Can you explain this task and the underlying principle?
    
    Solution:
    Grain seeds are quite tiny, light and too many in number. So removing them from their stalks would be impossible by just plucking each grain.
    Threshing is the process of separating grains from stalks. The stalks are beaten to release the grain seeds during this operation.
    Principle: By beating them against a hard stone or surface, very tiny and light-weight grains can be easily separated from harder stalks.
    
    
15. Justify: Sugar is added to water before ice cubes while making chilled lemonade juice.
    
    Solution:
    Solubility of sugar in water is affected by temperature. It is difficult to dissolve sugar in ice-cold water because the solubility of sugar crystals in water diminishes as the temperature of the water decreases.
    As a result, it is usually best to dissolve sugar in water before adding ice while making chilled lemonade.
    
    
16. Match the separation process mentioned in column A with the purpose of separation in column B and the treatment with separated components in column C.
    

    	Column A		Column B		Column C
    Type	Separation process		Purpose of separation		Treatment with separated components
    I	Churning of buttermilk	(a)	To remove solid not -useful component	(i)	We throw away the solid components.
    II	Separation of stones from millets	(b)	To separate two different but useful components	(ii)	We use both the components
    III	Separation of tea powder from boiled tea	(c)	To remove harmful impurities	(iii)	We throw away the harmful impurities.

    Also, suggest the type with which the below mentioned separation process would fit:
    Separation of salt from water.
    
    Solution:
    

    	Column A		Column B		Column C
    Type	Separation process		Purpose of separation		Treatment with separated components
    I	Churning of buttermilk	(b)	To separate two different but useful components	(ii)	We use both the components
    II	Separation of stones from millets	(c)	To remove harmful impurities	(iii)	We throw away the harmful impurities.
    III	Separation of tea powder from boiled tea	(a)	To remove solid not -useful component	(i)	We throw away the solid components.

    Separation of salt from water would fit in the type I where the purpose is to separate two different but useful components i.e. salt and water.

    And the treatment with separated components would be we can use both separated components.

    
    Assertion Reasoning Questions
    
    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
    
17. Assertion (A): Evaporation can be used to separate homogenous liquid mixture.
    Reason (R): Evaporation is the process in which liquid gets converted into vapour.
    
    Correct option: (d) A is false but R is true.
    Solution: Evaporation is used to separate homogenous mixture of solid dissolved in liquid. So the assertion is false. Evaporation is the process in which liquid gets vaporised and converts into gaseous phase that helps to separate the solid component dissolved in liquid easily. So, the reason is true.
    
    
18. Assertion (A): Sand can be separated from water by filtration.
    Reason (R): Sand and water makes heterogeneous mixture.
    
    Correct answer: (c) A is true but R is false.
    Solution: The mixture of sand and water is heterogeneous and can be separated using the filtration process. So the assertion is true. Sand is insoluble in water, resulting in a heterogeneous combination. As a result, the reason is false.
    
    
19. Assertion (A): Pebbles and stones are removed from sand by sieving.
    Reason (R): Sieving allows the fine particles to pass through the holes of the sieve while the bigger impurities remain on the sieve.
    
    Correct answer: (a) Both A and R are true and R is the correct explanation of A.
    Solution: Pebbles and stones are large-sized solid particles. As a result, sieving is employed to separate them from sand. As a result, the assertion is true. Sieving permits fine particles such as sand or flour to flow through its tiny holes, while larger particles such as stones and pebbles that cannot pass through the sieve's tiny holes become caught on top of it. So the reason is true.
    
    
20. Assertion (A): The mixture of water and sand is separated by sedimentation.
    Reason (R): The process of conversion of liquid water into water vapour is called evaporation.
    
    Correct answer: (b) Both A and R are true and R is not the correct explanation of A.
    Solution: Sand and water makes a heterogeneous mixture. Sand settles down naturally at the bottom of the beaker by force of gravity. Hence, sand can be separated from water by sedimentation. So, the assertion is true. Liquid water on heating to its boiling point get evaporated into vapours i.e. gaseous phase. This process is termed as evaporation. So, the reason is true. But, the reason is NOT the correct explanation of assertion.