Separation Techniques For Components Of A Mixture Class-7th Goyal Brothers Chemistry Solutions Chapter-3, Unit-3. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Study Questions of Chapter-3(Elements, compounds and mixture),Unit-3 (Separation Techniques For Components Of A Mixture). Visit official Website CISCE for detail information about ICSE Board Class-7.
Separation Techniques For Components Of A Mixture Class-7th
Goyal Brothers Chemistry Solutions Chapter-3 Unit-3
| Board | ICSE |
| Class | 7th |
| Subject | Chemistry |
| Book Name | Goyal Brothers |
| Theme-3 | Elements, compounds and mixture |
| Unit-3 | Separation Techniques For Components Of A Mixture |
| Topic | Solution of exercise questions |
| Session | 2023-24 |
OBJECTIVE TYPE QUESTIONS
Chemistry Solutions Chapter-3 Unit-3
A. Fill in the blanks :
- The separation of two _immiscible_ liquids is based on the difference in their densities.
- Substances like _ammonium chloride_ can be removed from a mixture by the process of sublimation.
- Common salt can be obtained from common salt solution, by the process of _evaporation_.
- The _fractional_ distillation is useful only if the difference in the boiling points of two miscible liquids is between 10 degree Celsius to 20 degree celsius or more.
- All puree substances contain _same_ particles or group of particles having a definite set of properties.
B. Statement given below are incorrect. write the correct correct statement:
1. Iodine is removed from the mixture of iodine and sand by the process of evaporation.
Correct Statement: Iodine is removed from the mixture of iodine and sand by the process of sublimation.
2. Kerosene oil is separated from the mixture of kerosene oil and water by the process of distillation.
Correct Statement: Kerosene oil is separated from the mixture of kerosene oil and water by the process of fractional distillation.
3. Pure water is obtained from sea water by the combined process of decantation and filtration.
Correct Statement: Pure water is obtained from sea water by the combined process of distillation.
4. The components of a mixture are present in a fixed ratio.
Correct Statement: The components of a mixture are not present in a fixed ratio.
5. Fractional distillation is used for separating any two immiscible liquids.
Correct Statement: Fractional distillation is used for separating any two miscible liquids.
C. Match the statement in Column A with those in Column B:
Column A |
Column B |
1. A substance obtained by combining two or more pure substance in a definite ratio. |
(a) Distillation |
2. Removing soluble solids from their solution in water. |
(b) Compound |
3. Removing insoluble impurities from muddy water by allowing it to settle. |
(c) Separating funnel |
4. A process from which pure water is obtained in gulf countries. |
(d) Evaporation |
5. A device which is used to separate two immiscible liquids. |
(e) Sedimentation |
Answer:
| Column A | Column B |
| 1. A substance obtained by combining two or more pure substance in a definite ratio. | (b) Compound |
| 2. Removing soluble solids from their solution in water. | (d) Evaporation |
| 3. Removing insoluble impurities from muddy water by allowing it to settle. | (e) Sedimentation |
| 4. A process from which pure water is obtained in gulf countries. | (a) Distillation |
| 5. A device which is used to separate two immiscible liquids. | (c) Separating funnel |
D. Write ‘True’ or ‘False’ for the following statements :
- A mixture in which its components are uniformly distributed is known as the homogeneous mixture [T]
- The pure water can be obtained from seawater by the process of filtration. [F]
- Sand can be obtained from a mixture of sand and sulphur by the process of distillation. [F]
- Kerosene oil is separated from the mixture of kerosene oil and water by the process of fractional distillation. [T]
- Common salt from sea water is obtained by the process of evaporation. [T]
E. Tick (√) the most appropriate answer.
1. A solid from its hot vapour is obtained by :
(a) filtration
(b) evaporation
(c) centrifugation
(d) Sublimation
Ans: (d) Sublimation
2. The method used in separating various constituents of coloured solute present in a mixture like ink, dyes, etc., is known as:
(a) Fractional distillation
(b) Separating funnel
(c) Paper chromatography
(d) none of these
Ans: (c) Paper chromatography
3. The process of separation of two miscible liquids having difference of their boiling points 10 degree Celsius to 20 degree Celsius, is known as :
(a) distillation
(b) Fractional distillation
(c) Filtration
(d) Sublimation
Ans: (a) distillation
4. A mixture in which its components are not uniformly distributed is known as :
(a) Solution
(b) Homeoeneous
(c) Heterogeneous
(d) None of these
Ans: (c) Heterogeneous
5. Iodine can be separated from a mixture of iodine and sand by the process of :
(a) Sublimation
(b) Decantation
(c) Filtration
(d) Evaporation
Ans: (a) Sublimation
STUDY QUESTIONS
Chemistry Solutions Chapter-3 Unit-3
Question 1. Define the following terms :
(a) Evaporation: Evaporation is a process by which water is transformed from liquid to a gaseous state. Heat is the main cause of evaporation.
(b) Sublimation: Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid. Example: Dry ice” or solid carbon dioxide sublimes.
(c) Fractional Distillation: The process of taking a chemical mixture and using heat to separate out the various components in that mixture is called fractional distillation.
(d) Separating Funnel: A separating funnel is a funnel that is used to separate immiscible liquids.
Question 2. What do you understand by the following terms :
(a) Paper chromatography: Paper chromatography is a technique which is used to separate low-molecular-mass compounds based on their distribution between stationary phase and mobile phase.
(b) Distillation: Distillation is a process of heating a solution in such a way that liquid converts into its vapors and then these vapors are cooled and collected.
(c) Distillate: A distillate is a liquid which is condensed from a vapor during distillation.
Question 3. Describe an experiment for separation of common salt from a mixture of common salt and water.
Answer: Water and salt can be separated through the process of distillation or evaporation. The water is boiled till it evaporates into vapor and leaves salt behind as a solid. The boiling point of water is lower compared to the boiling point of salt.
Question 4. Describe an experiment for separation of pure ammonium chloride from a mixture of common salt and ammonium chloride.
Answer: A mixture of ammonium chloride and common salt can be separated using sublimation.
Question 5. Describe an experiment for separation of kerosene oil from a mixture of kerosene oil and water.
Answer: Take the mixture of kerosene oil and water and pour it in the separating funnel placed on a tripod stand. Place an empty beaker below the stem of the separating funnel to collect the liquid. As kerosene oil has less density than water, kerosene forms the upper layer whereas water forms the bottom layer.
Question 6.
(a) How is paper chromatography used to separate various components of coloured solutes present in a mixture like ink, dyes, etc. ?
Answer: To perform ink chromatography, you put a small dot of ink to be separated at one end of a strip of filter paper. This end of the paper strip is placed in a solvent. The solvent moves up the paper strip and, as it travels upward, it dissolves the mixture of chemicals and pulls them up the paper.
(b) List some solvents other than water and state their uses.
Answer: Some solvents other than water and state their uses are
- Ethanol: It is an important industrial chemical.
- Methanol: It is used in plastics, paints, car parts.
- Acetone: It is used as nail polish remover, paint remover.
- Toluene: It is used in making paints, paint thinners.
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