Separation of Substances - Class 6 - Science
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Extra Questions - Separation of Substances | NCERT | Science | Class 6
Why do we separate substances in a mixture?
i) To separate two different but useful components.
ii) To remove useless components.
iii) To remove impurities.
A) Only (i) and (ii) are correct.
B) Only (ii) and (iii) are correct.
C) Only (i) and (iii) are correct.
D) (i), (ii), and (iii) are all correct.
The correct answer is Option D:
(i) To separate two different but useful components
(ii) To remove useless components
(iii) To remove impurities
All of the above reasons are correct causes for separating substances in a mixture. Subsequently, we often need to separate mixtures for various reasons, such as:
Obtaining valuable or usable components, like extracting drinking water from seawater.
Eliminating components that are not needed or could be harmful if included in the end product.
Purifying substances by removing impurities that may affect the quality or safety of a product.
Example:
Consider seawater; it contains salt, which is vital for culinary uses and as an electrolyte in our diet. Direct consumption or use of seawater isn't feasible due to its impurities and excess minerals. Thus, the salt is extracted and purified through the process of separation.
Which of the following can be separated using filter paper?
A Tea leaves from tea
B Mud from water
C Pebbles from sand
D Seeds from fruit juice
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Sign up nowThe most suitable method for the separation of a 1:1 mixture of ortho and para-nitrophenol is:
A Sublimation
B Chromatography
C Crystallization
D Steam distillation
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Sign up nowThe process of separation of the clear liquid present above the settled insoluble solid after sedimentation of a mixture is called $\qquad$.
A. Filtration
B. Winnowing
C. Decantation
D. Evaporation
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Sign up now$23.4 \mathrm{~g}$ of common salt (Molar mass $ = 58.5 \mathrm{~g} / \mathrm{mol} $) is dissolved in $780 \mathrm{~g}$ of water (molal depression constant $ = 1.86^{\circ} \mathrm{C} / \mathrm{m} $) and the solution so formed is put in a freezer having a constant temperature of $ -2^{\circ} \mathrm{C} $ (Freezing point of pure water is $ 0^{\circ} \mathrm{C} $). What mass of water (in g) will separate out as ice?
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Sign up nowQuestions & Answers - Separation of Substances | NCERT | Science | Class 6
Why do we need to separate different components of a mixture? Give two examples.
We need to separate different components of a mixture for two main reasons: to remove harmful or non-useful substances mixed with it and sometimes to use the useful components separately. For example, during the preparation of tea, tea leaves are separated from the liquid using a strainer to remove the non-useful solid particles. In agriculture, grain is separated from stalks during harvesting to use the grain for food, while the stalks can serve other purposes like fodder.
What is winnowing? Where is it used?
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Sign up nowLemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar?
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