Chhattisgarh State Class 6 Science Chapter 4 Solution
Chhattisgarh State Board Class 6 Science Chapter 4 Separation of Matter Exercise Multiple Choice, Fill in the Blanks, Questions and Answers here.
(1)
1.) Which of the following mixture can be separated by hand picking – III) Rice and stone
2.) Which method is used when we wash a pulse to clean it – II) Hand Picking
3.) Which method is used for separating a mixture of Iron and coal dust – IV) Magnetic separation
4.) Which method is used to separate a mixture of Iodine and common salt – IV) Decantation
(2)
a) Separation of ammonium chloride and sand – Sublimation
b) Mixing alum in muddy water – Loading
c) Revolving a mixture at high speed – Centrifugation
d) Groundnut oil and water – By separating funnel
e) Sand and iron fillings – Magnetic separation
f) Common salts dissolved in water – Evaporation
(3)
a) ( Magnetic separation ) method is used to separate iron filling from heap of garabage .
b) Two immiscible liquids can be separated with the help of ( Separating funnel ) method .
c) Flour and bran can be separated by ( Sieving ) method .
d) ( Threshing ) method is used to separate wheat from straw .
f) We can see the sky clearly after the rains because dust particles ( Distilled ) with the rain droplets and come to earth .
(4)
a) How will you separate a mixture of naphthalene and sand?
First I will put a mixture of napthalene and sand in the porcelain bowl and keep an inverted funnel over this mixture . I will close the open end of the funnel with cotton and the white fumes will rise from the mixture while heating . then I will stop heating and after some time the vapours of napthalene will settle on the inner side of the funnel on cooling and sand will be left in the bowl .
This is how I will separate the mixture of napthalene and sand by Sublimation method .
b) Suggest a method to separate, a mixture of coconut oil and water.
We can separate a mixture of coconut oil and water by Separating funnel method . If we keep the mixture in a separating funnel and leave it for some time , water settles as the lower layer while coconut oil settles as the upper layer . Then we open the stop clock at the base of the funnel and collect the heavier layer of water in a bekar .
c) How will you separate alum from alum solution?
First I will fill a beaker with alum solution . Then I will heat the solution and filter the hit solution through filter paper to remove alum . After cooling it , the alum in a form of crystal at the base of the beaker . This is how I will separate alum from alum solution by Crystallisation method .
(5)
a) Salt and chalk powder – Filtration
b) Rice and straw – Threshing
c) Iodine and coal – Sublimation
d) Iron fillings and saw dust – Magnetic separation
e) Sand and rise – Sieving
(6) How do you obtain salt from seawater?
Common salt is obtained from seawater in large scale by using Evaporation method . At the time of high tide , seawater gets collected in small cubicals . This water is evaporated in the sun and salt remains in the cubical .
(7) What is criterion for the selection of method to separate the components from a mixture?
The criterion for the selection of method to separate the components from a mixture is , a particular characteristic of one of the component is used to separate the components from a mixture , a characteristic which is not present in the other components .
(8) Write four methods used to purify river water to obtain drinking water by the water purification plant.
The four methods used to purify river water to obtain drinking water by the water purification plant are , Sedimentation , Loading , Decantation and Filtration .
(9) Explain distillation with help of diagram.
Distillation – first arrange the apparantus according to the disgram and put the salt solution in the conical flask and heat it . Water vapour , which come out , moves into the glass tube and is collected in a test tube kept in ice . When water vapour comes in contact with the ice-cold walls of test tube , it changes into small droplets of water . Salt is left in the conical flask . Changing of water to water vapour is called evaporation and changing of water vapour back to water is called condensation . Thus we can say that distillation is the result of both evaporation and condensation . By using this method we can separate solute and solvent from a solution .
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