In this page, we are providing Separation of Substances Class 6 Extra Questions and Answers Science Chapter 5 pdf download. NCERT Extra Questions for Class 6 Science Chapter 5 Separation of Substances with Answers will help to score more marks in your CBSE Board Exams. https://ncertmcq.com/extra-questions-for-class-6-science/
Class 6 Science Chapter 5 Extra Questions and Answers Separation of Substances
Extra Questions for Class 6 Science Chapter 5 Separation of Substances with Answers Solutions
Separation of Substances Class 6 Extra Questions Very Short Answer Type
Class 6 Science Chapter 5 Extra Questions Question 1.
What are the components of air?
Answer:
Oxygen, carbon dioxide, nitrogen, etc.
Separation Of Substances Class 6 Extra Questions Question 2.
What are the components of milk?
Answer:
Milk-proteins, calcium, cream and water.
Separation Of Substances Class 6 Questions And Answers Question 3.
What are the types of mixture?
Answer:
Heterogeneous mixtures and homogeneous mixtures.
Class 6 Science Ch 5 Extra Questions Question 4.
Name the process used to separate heavier and lighter components of a mixture.
Answer:
Winnowing
Ncert Class 6 Science Chapter 5 Extra Questions Question 5.
Mention one purpose of separating the constituents of a mixture.
Answer:
To remove the undesirable substances.
Separation Of Substances Extra Questions Question 6.
When handpicking is used?
Answer:
Handpicking is used to separate undesirable components having different shape, size, colour and are present in small amount.
Questions On Separation Of Substances Class 6 Question 7.
Which type of separation process is used in cashewnut factories?
Answer:
Sieving
Separation Of Substances Class 6 Extra Questions Answers Question 8.
Name the process used to obtain salt from sea water.
Answer:
Evaporation
Separation Of Substances Question Answer Question 9.
Write opposite of the process of condensation.
Answer:
Evaporation
Extra Questions For Class 6 Science Chapter 5 Question 10.
What is effect of temperature on solubility?
Answer:
Solubility increases when temperature increases.
Class 6 Chapter 5 Science Extra Questions Question 11.
Name the process of obtaining clear water from muddy water in which alum is used.
Answer:
Loading
Science Class 6 Chapter 5 Extra Questions Question 12.
Which method is used to separate a mixture of tea leaves and iron filings?
Answer:
By magnet
Class 6 Separation Of Substances Extra Questions Question 13.
Which gas dissolved in water helps aquatic animals to breathe?
Answer:
Oxygen gas
Extra Questions On Separation Of Substances Class 6 Question 14.
Name the method by which you can separate butter from milk.
Answer:
Centrifugation
Separation Of Substances Questions And Answers Question 15.
Which liquid is called as universal solvent?
Answer:
Water
Question 16.
Name some materials that are used as filters.
Answer:
Cotton, ceramic, fine cloth, filter paper, etc.
Question 17.
Give one example of sieving used in everyday life.
Answer:
Separation of bran from flour.
Question 18.
Which substance is used for loading?
Answer
Alum
Question 19.
Which process is used to separate bacteria from water?
Answer:
Filtration by using bacteria proof filters.
Question 20.
Name the process of separating two immiscible liquids.
Answer:
Decantation
Separation of Substances Class 6 Extra Questions Short Answer Type
Question 1.
Why mixtures need to be separated?
Answer:
The main reason for separating the mixtures are:
- To remove undesirable substances.
- To get desirable substances.
- To obtain highly pure substances.
Question 2.
What is handpicking? When this method is used?
Answer:
The method in which the constituents are separated by simply picking them up by hand is called hand-picking. It is used when there is a difference in size, colour, shape of desirable and undesirable constituents.
Question 3.
What is evaporation? What is the significance of this process?
Answer:
The changing of liquid into vapours is called evaporation. The process of evaporation is used on a large scale to obtain common salt from sea water.
Question 4.
What is threshing?
Answer:
The process of separating grains from the stalks is called threshing.
Question 5.
What is the use of decantation?
Answer:
Decantation is used to separate insoluble solids from liquids. Two immiscible liquids are also separated by this process.
Question 6.
What is a mixture?
Answer:
When two or more than two substances are mixed together in any ratio then it is called a mixture.
Question 7.
What is decantation?
Answer:
Decantation is the process of separating insoluble solids from liquids. A suspension of solid particles in liquid is allowed to stand for some time. Solid particles settle down at the bottom. The clear water is then transferred into another beaker.
Question 8.
State one use of the method of winnowing.
Answer:
The method of winnowing is used to separate husk from various types of grain like wheat, rice, etc. Give one use of the handpicking method of separating mixtures in daily life. The method of handpicking is usually used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses.
Question 9.
Define the term sedimentation.
Answer:
The process in which heavier, insoluble solid settles down in a solution is called sedimentation.
Separation of Substances Class 6 Extra Questions Long Answer Type
Question 1.
Elaborate the process of filtration.
Answer:
Filtration is the process of separating an insoluble solid from a liquid with the help of a filtering agent like filter paper, cloth, strainer, etc. During filtration, the solid insoluble substance is retained at the filter paper as residue while the liquid free from any suspended matter passes through the filter paper and is collected as filtrate.
There are certain soluble components infiltrate which can be separated by the process of evaporation followed by crystallization.
Question 2.
What is meant by saturated and unsaturated solution?
Answer:
- Saturated solution: At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving, is said to be a saturated solution.
- Unsaturated solution: A solution in which more quantity of solute can be dissolved without raising the temperature of the solution is called unsaturated solution.
Question 3.
What is the effect of temperature on a saturated solution?
Answer:
(i) When a saturated solution is heated to a higher temperature, then it becomes unsaturated because the solubility of solute increases with increase in temperature of the solution.
(ii) When a saturated solution is cooled to a lower temperature, then some of the dissolved solute separates out in the form of solid crystal because the solubility of solute decreases on cooling the solution.
Question 4.
What is the importance of centrifugation? How it is done?
Answer:
Centrifugation is the process of separating suspended particles from a liquid by rotating the liquid at a high speed.
The mixture is taken in a closed bottle and rotated at a high speed. The heavy particles settle at the bottom while light particles remains behind. The method is also used to separate cream from milk. Cream being lighter than milk, floats at the top of the mixture.
Question 5.
What is loading? How will you obtain clear water from muddy river water by the process of loading?
Answer:
The suspended small particles of muddy water are negatively charge which inhibit them to settle down due to repulsion. On adding alum to this muddy water, removes the negative charge from the particles. This particles forms clump easily, become heavier and settles down.
This process is called loading. Loading helps in purification of water from small suspended particles which do not settles down easily and quickly. The clear water after settling down of suspended particles is decanted in another container and is comparatively clearer.
Separation of Substances Class 6 Extra Questions HOTS
Question 1.
Rahul by mistake mixed sugar with salt. What method he must adopt to quickly separate this mixture?
Answer:
He must use the method of sieving for separating salt and sugar.
Question 2.
Can we separate the mixture of sugar and milk?
Answer:
No
Question 3.
Which method of separation will you adopt to separate a mixture of wheat flour, moong dal and chana?
Answer:
We will adopt the method of sieving followed by handpicking to separate the mixture. Sieving will separate wheat flour from moong dal and chana. Handpicking will separate moong dal from chana. Sieve with appropriate pores can also be used to separate moong dal from chana.
Question 4.
Suggest any two methods to separate suspended particles of mud from water.
Answer:
Loading with alum and centrifugation.
Question 5.
Is there any method through which we can separate different components of ink?
Answer:
Chromatography technique.
Separation of Substances Class 6 Extra Questions Value Based Question (VBQs)
Question 1.
Some shopkeepers mix many cheap and harmful substances in the food materials. This process is called adulteration. Anybody who are involved in such kind of illegal practices are liable for imprisonment.
(a) Why shopkeepers mix cheap and harmful substances in food materials?
(b) How will you separate impurities from grains and pulses?
(c) What values of shopkeepers are shown here?
Answer:
(a) Shopkeepers add these undesirable substances to increase the quantity of the food materials and thus their profit.
(b) Through handpicking.
(c) Shopkeepers observing such practices are greedy, self-centred, criminal-minded and soulless.
Question 2.
There were guests at Sonam’s house. Sonam thought of making lemonade for them. She dissolved sugar in chilled water and observe that sugar was taking long time to dissolve. Meanwhile, Sonam’s mother came and asked her to transfer the upper chilled water in another container and then add water at normal temperature to this sugar settled at bottom.
Sonam then found it easy to dissolve the sugar for lemonade.
(a) What is saturated solution?
(b) What is the effect of temperature on the capacity of water in dissolving substances?
(c) What will happen if we cool a supersaturated solution?
(d) What value of Sonam is shown here?
Answer:
(a) A saturated solution is the solution which cannot dissolve any more solute in it at a given temperature.
(b) With increase in temperature solubility of a substance increases in water and vice versa.
(c) When a supersaturated solution is cooled, it form crystals of the salt. This process is known as crystallization.
(d) Sonam is a good host, learner, helpful girl.