{"id":16374,"date":"2023-07-14T17:29:23","date_gmt":"2023-07-14T11:59:23","guid":{"rendered":"https:\/\/tsboardsolutions.in\/?p=16374"},"modified":"2023-07-14T17:29:23","modified_gmt":"2023-07-14T11:59:23","slug":"ts-board-6th-class-science-important-questions-7th-lesson","status":"publish","type":"post","link":"https:\/\/tsboardsolutions.in\/ts-board-6th-class-science-important-questions-7th-lesson\/","title":{"rendered":"TS Board 6th Class Science Important Questions 7th Lesson Separation of Substances"},"content":{"rendered":"

These TS 6th Class Science Important Questions<\/a> 7th Lesson Separation of Substances serves as a valuable tool for students to prioritize their studying and revision efforts.<\/p>\n

TS 6th Class Science Important Questions 7th Lesson Separation of Substances<\/h2>\n

Question 1.
\nWhat type of mixture is our soil?
\nAnswer:
\nA natural mixture<\/p>\n

Question 2.
\nCan water be used to separate the components of any mixture?
\nAnswer:
\nNo.<\/p>\n

\"TS<\/p>\n

Question 3.
\nHow can you separate rotten fruits from fresh fruits?
\nAnswer:
\nHand picking process.<\/p>\n

Question 4.
\nWhich property helps in separating the husk from grain?
\nAnswer:
\nDifference in weights of the husk and grains.<\/p>\n

Question 5.
\nWhy sedimentation takes place?
\nAnswer:
\nDue to gravity.<\/p>\n

Question 6.
\nHow does precipitation differ from sedimentation?
\nAnswer:
\nPrecipitation is rapid, whereas sedimentation is a very slow process<\/p>\n

\"TS<\/p>\n

Question 7.
\nCan you have filter papers with different pore sizes?
\nAnswer:
\nYes.<\/p>\n

Question 8.
\nWhich of the following does sublime, when heated?
\n(a) camphor
\n(b) common salt
\n(c) Iodine
\n(d) Ammonium chloride
\nAnswer:
\nItems a, c and d sublime<\/p>\n

Question 9.
\nWhich process can be used to remove impurities from water?
\nAnswer:
\nDistillation<\/p>\n

Question 10.
\nHow is butter taken out from milk or curd?
\nAnswer:
\nBy Churning<\/p>\n

Question 11.
\nWhich method is better for separating tea leaves from prepared tea, decantation or filtration?
\nAnswer:
\nFiltration.<\/p>\n

\"TS<\/p>\n

Question 12.
\nWhat is the reverse of evaporation?
\nAnswer:
\nCondensation.
\n(Note : The process of conversion of vapour into its liquid form is called condensation.)
\n\"TS<\/p>\n

Question 13.
\nList out the different substances that are used to make the items given in the following table.
\n(Or)
\nDefine mixtures. Name some of the mixtures, that you have seen, tested in your daily life. List out the different substances that are used to make above said mixtures.
\nAnswer:
\nDefinition: The component having more than one substance is called mixture.<\/p>\n\n\n\n\n\n\n\n\n
Item<\/td>\nSubstances<\/td>\n<\/tr>\n
1. Tea<\/td>\nMilk, tea leaves, sugar and water.<\/td>\n<\/tr>\n
2. Item<\/td>\nBengal gram flour; vegetable oil or ghee; cashew nuts, cardamom and sugar (or Jaggery)<\/td>\n<\/tr>\n
3. Lemon Juice<\/td>\nLemons, sugar and water<\/td>\n<\/tr>\n
4. Concrete<\/td>\nCement, sand, small stones and water.<\/td>\n<\/tr>\n
5. Soil<\/td>\nWeathered rock, organic material (humus),water and air.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 14.
\nThe materials ghee, wax, sand, sugar, salt, haldi, dal, plastic, wood and iron nails are supplied. Answer the following.<\/p>\n

(i) Which materials float on water?
\nAnswer:
\nWax, plastic and wood float on water.<\/p>\n

(ii) Which materials sink in water?
\nAnswer:
\nSand, dal and iron nails sink in water.<\/p>\n

(iii) Which materials are soluble in water?
\nAnswer:
\nSugar and salt are soluble in water.<\/p>\n

\"TS<\/p>\n

(iv) Which materials are insoluble in water?
\nAnswer:
\nGhee and haldi are insoluble in water.<\/p>\n

Question 15.A.
\nYou might have come across some situations where you have to separate some components from a mixture. Write down two examples of such situations.
\nAnswer:
\nCase 1. Stones are separated from pulses.
\nCase 2. Husk is separated from wheat flour.<\/p>\n

Question 15. B.<\/p>\n

(i) Did you able to separate each component from the mixture?
\nAnswer:
\nYes.<\/p>\n

(ii) Are the methods used to separate the components same in all these instances?
\nAnswer:
\nNo.<\/p>\n

(iii) What are the properties of the components that are used in separating them?
\nAnswer:
\nIn case 1, hand picking. The colour difference between the pulses and the stones made it possible to separate them by hand picking. In case 2, sieving, difference in size between the flour particles (very fine) and the husk particles (large).<\/p>\n

Question 16.
\nCan you separate salt from sand by hand picking?
\nAnswer:
\nNo.<\/p>\n

\"TS<\/p>\n

Question 17.
\nWhat differences in the properties of rice, pulses and stones help us in separating them by the method of hand picking?
\nAnswer:
\nThere are two reasons.<\/p>\n

    \n
  • The size of the stone is different from rice or pulses.<\/li>\n
  • The colour of stone, rice and pulses are different.<\/li>\n<\/ul>\n

    Question 18.
    \nGive some examples of day-to-day life, where the hand-picking method is used.
    \nAnswer:<\/p>\n

      \n
    • Separating tomato, green chillis and radish.<\/li>\n
    • Rotten eggs are removed from fresh eggs.<\/li>\n
    • Separating pencils and erasers.<\/li>\n<\/ul>\n

      Question 19.
      \nA little of the soil is shaken with water in a glass tumbler. It \u00a1s kept undisturbed for some time. Then mud particles settle at the bottom of the tumbler. Why is it so?
      \nAnswer:<\/p>\n

        \n
      • Mud is not soluble in water.<\/li>\n
      • Mud is heavier than water.
        \nSo mud particles settle at the bottom of the tumbler<\/li>\n<\/ul>\n

        Question 20.
        \n(a) Can you separate mud from muddy water using a sieve?
        \nAnswer:
        \nNo.<\/p>\n

        (b) How small should be the pores of the sieve to do this?
        \nAnswer:
        \nThe size of the pores of the sieve should be smaller than the size of the fine mud particles.<\/p>\n

        (c) Now, you use a cloth as a sieve. Is the water clear after sieving?
        \nAnswer:
        \nNo, the water is not clear.<\/p>\n

        \"TS<\/p>\n

        Question 21.
        \nHow is salt extracted from sea water?
        \nAnswer:
        \nSea water is captured in wide pans and is exposed to air and sunlight. Then water evaporates and the salt is left behind in the pAnswer: The process is called \u2018crystallisation.\u2019<\/p>\n

        Question 22.
        \nWhat is \u2018distilled water\u2019?
        \nAnswer:
        \nWhen water is boiled, some water vapourises. These vapours are collected in a flask and cooled. Then these vapours turn into water. This water is free from impurities. It is called \u2018distilled water\u2019.<\/p>\n

        Question 23.
        \nWhat are the uses of \u2018distilled water\u2019?
        \nAnswer:<\/p>\n

          \n
        • The injection powder is first mixed with distilled water. Then this liquid is injected to patients, by doctors.<\/li>\n
        • In chemical laboratories, distilled water is used during chemical analysis.<\/li>\n<\/ul>\n

          Question 24.
          \nIn order to separate the components of a mixture, we make use of their difference in colour, shape, size, weight, solubility.
          \n(a) Can we use these features for separating mixtures of powdered salt and camphor?
          \nAnswer:
          \nNo. However, property of solubility may be used in common salt dissolves in water, while camphor is insoluble in water. Now the salt is recovered from the salt water, by evaporation process.<\/p>\n

          (b) What other properties can be use?
          \nAnswer:
          \nSublimation. Camphor sublimes. Salt does not sublime.<\/p>\n

          Question 25.
          \nWhat is chromatography?
          \n(Or)
          \nWhich method is used to separate colours from a mixture of colours?
          \nAnswer:
          \nChromatography is a technique used for separating mixtures of gases, liquids or dissolved substances.<\/p>\n

          \"TS<\/p>\n

          Question 26.
          \nGive an example of chromatography.
          \nAnswer:
          \nInk appears to be made of a simple colour but it is actually a mixture of many colours. The qualitative separation of ink into its component colours can be done using chromatography.<\/p>\n

          Question 27.
          \nWhere do we use chromatography method?
          \nAnswer:
          \nChromatography is used to separate the colours and then identify the components of a mixture. Ex: Ink, green pigment of leaf, dyes, etc.<\/p>\n

          Question 28.
          \nDescribe any four methods which separate the material.
          \nAnswer:<\/p>\n

            \n
          • Winnowing \u2013 Eg: Separation of husk from the paddy grains<\/li>\n
          • Hand \u2013 picking: Eg: Separation of stones from rice and pulses<\/li>\n
          • Crystallization \u2013 Eg : Separation of soluble substances from the solution.<\/li>\n
          • Decantation \u2013 Eg: Floating substance is separated by leaving the sediment in the container.<\/li>\n
          • Chromatography \u2013 Eg: Separation of colours from different mixtures of colours.<\/li>\n<\/ul>\n

            Question 29.
            \nHow do farmers separate husk from grains?
            \nAnswer:
            \nFarmers separate husk from grains by the method called \u201cWinnowing\u201d.<\/p>\n

            Question 30.
            \nWrite the method you follow to separate
            \n(a) Mud from water
            \n(b) Husk and flour
            \nAnswer:
            \n(a) Mud from water : Filtration
            \n(b) Husk and flour : Sieving<\/p>\n

            Question 31.
            \nWhat is sublimation ? Give an example.
            \nAnswer:
            \nThe process in which a substance changes directly from solid to gaseous form and vice-versa is called sublimation. Eg: Sublimation of camphor.<\/p>\n

            \"TS<\/p>\n

            Question 32.
            \nCan you separate salt from salt water, using a filter paper? If not, why?
            \nAnswer:
            \nNo.
            \nReason : The particles of salt dissolved in water are so small in size, that they easily pass through the fine pores of the filter paper. So they can\u2019t be separated by filtration.<\/p>\n

            Question 33.
            \nRani filtered mud water by using filter paper. You cannot understand how it is possible. Write down some questions which will be asked by you.
            \nAnswer:<\/p>\n

              \n
            • How can we separate mud from water?<\/li>\n
            • is it possible to separa te mud from water?<\/li>\n
            • What are the tools required to filter mud water?<\/li>\n
            • Is mud water filtered easily?<\/li>\n
            • Are there any techniques to filter mud water?<\/li>\n<\/ul>\n

              Question 34.
              \nHemanth purchased green chilli, coriander seeds, tomato, red gram, wheat flour and kept them safely in a bag. While returning he fell and all the items in the bag got mixed. How will he separate?
              \n1. Which material will he separate first?
              \n2. How would he separate tomato and chilli?
              \n3. How would he separate wheat flour?
              \n4. How would he separate coriander seeds?
              \nAnswer:<\/p>\n

                \n
              1. First tomato and chilli are separated.<\/li>\n
              2. By hand picking.<\/li>\n
              3. Wheat flour is separated by sieving.<\/li>\n
              4. Coriander seeds can be separated from red gram by winnowing.<\/li>\n<\/ol>\n

                \"TS<\/p>\n

                Question 35.
                \nWhat is distilled water? Write the arrangement of apparatus to make distilled water by distillation with a neat labelled diagram.
                \n(Or)
                \nWhat process do you follow to obtain distilled water on your own? Explain the procedure. Mention the apparatus.
                \n(Or)
                \nWrite the procedure and precautions taken in the extraction of distilled water experiment.
                \nAnswer:
                \nThe water content that is made free from impurities by the process of vapourisation technique is called distilled water.
                \nPreparation of distilled water:
                \n\"TS
                \nRequired apparatus : Two conical flasks, water, plastic tube, bunsen flame, tripod, 2 single holed rubber corks etc.<\/p>\n

                Precautions:<\/p>\n