Numericals Also molecular interaction in a suspension is not strong enough to keep the particles suspended and hence they settle down. Classify each of the following as a physical or a chemical change. The size of colloidal particles is less than lnm, while the size of pores present in an ordinary filter paper is larger than lnm. Mass of salt present in the solution = 20 g (e) Churning of milk cream to get butter. They tried the same activity by taking a salt solution but found that light simply passed through it. Justify your choice. (i). 1. Comment. If so, write the chemical equation involved. (c) Common salt, water and sand Hence, a colloidal solution cannot be separated by filtration. Water is a compound because of the following reasons: Question 1. CBSE Shemushi Sanskrit Class 9- Chapter 2- स्वर्णकाकः NCERT Exercise Solution ( Question-Answer) is provided below. Close the stopcock of the separating funnel as the oil reaches the stopcock. An unknown substance ‘A’ on thermal decomposition produces ‘B’ and ‘C’. A solution is said to be diluted, concentrated or saturated on the basis of the amount of solute dissolved in the solution. Distillation is a process of boiling a liquid and then condensing the vapour obtained into a liquid. Answer: Question 4. (iii) Ammonia gas How much water should be mixed with 12 mL of alcohol so as to obtain 12% alcohol solution? How will you identify the gases evolved? Explain using a diagram. What is […] Metalloids – Germanium, boron. Question 5. [NCERT Exemplar] Question 2. = 550 g. Question 5. (c) An acetone bottle is left open and the bottle becomes empty. On heating, calcium carbonate gets converted into calcium oxide and carbon dioxide. Answer: Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. If a beam of light is put on a salt solution kept in a beaker in a dark room, the path of light beam is not visible inside the solution when seen from the other side. (i) What would you expect to see, if the ink contains three different coloured components? (b) No, solid solutions and gaseous solutions are also possible. Identify the dispersed phase and dispersing medium in the following colloids. (d) Kerosene oil, water and salt. Sodium chloride will dissolve in water and sand is left as residue on the filter paper. CaO + H2O → Ca(OH)2 (basic solution) Immiscible layers separate out in layers depending on their densities in separating funnel. (a) Fog (a) Iodine Question 15. Find out the mass percentage of the solution. Question 11. If the work done by a body on application of a constant force is directly proportional to the distance travelled by the body, express this in the form of an equation in two variables and draw the graph of the same by taking the constant force as 5 units. Answer: (b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas. (a) Separation by using separating funnel Question 6. Volume of water = 75 mL They can be separated by fractional distillation. Answer: The scattering of light by colloidal particles is known as Tyndall effect. Rain water stored in a tank contains sand grains, unfiltrable clay particles, calcium carbonate, salt, pieces of paper and some air bubbles. Classify the following into metals, non-metals and metalloids: Pond water, fog, aluminium paint, vinegar and glucose solution. (i) Sulphur powder (ii) would show Tyndall effect? What is people as a resource? Chapter 1- The Story of Village Palampur Chapter 2- People as Resource Chapter 3- Poverty as a Challenge Which sample of water will not freeze at 0°C? (a) Solid potassium chloride will separate out. (i) Pure sand (c) Coloured gemstone—solid, solid. Extra questions for CBSE class 9 maths chapter 2 with solution. Answer: ‘A’ dissolved 50 g of NaOH in 100 mL of water, ‘B’ dissolved 50 g of NaOH in 100 g of water while ‘C’ dissolved 50 g of NaOH in water to make 100 mL of solution. Show diagrammatically how water is purified in the waterworks system and list the processes involved. Students can get Class 9 English NCERT Solutions, Chapter Wise CBSE Class 9 English Important Questions and Answers will make your practice complete.. Here we have provided the chapter wise CBSE important questions for Class 9 Science. Extra Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure. Question 13. You are given two samples of water labelled as ‘A’ and ‘B’. Atoms and Molecules Class 9 Extra Questions Very Short Answer Questions. (vi) Helium. Classify the following as physical or chemical properties: Here you can get NCERT Extra Questions for Class 9 Science with Answers. Answer: Question 4. Question 6. Question 1. Answer: Check other important resources for exam preparation. (a) Explain why the milk sample was illuminated. Name two elements which exist in liquid state at room temperature. Solution: Iron filings will get attach to the magnet and thus separate from the mixture. Differentiate between a true solution and a colloid. some impurities may remain dissolved in the solution even after filtration. Mention one example of hard and soft rock with their use. (b) Rising of hot air over a radiator. FeS(s) + 2HCl(aq) → FeCl2(aq) + H2S(g). Polynomials in one variable, zeroes of polynomial, Remainder Theorem, Factorization, and Algebraic Identities. Size of particles is too small to be seen by naked eye. [NCERT Exemplar] (c) Detergent solution, sulphur solution. ∴ Mass of glucose = $$\frac{40 \times 250}{100}$$ = 100g (b) an aqueous sugar solution is heated to dryness? Iron filings and sulphur were mixed together and divided into two parts ‘A’ and ‘S’. (i) would not leave residue on filter paper after filtration? (c) Filtration to separate sand followed by evaporation/distillation Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Volume of solution = (12 + x) mL Answer: Question 7. (b) Bromine Why is water called universal solvent? Answer: Fe(i) + S(s) → Mixture of iron filings and sulphur Construct a right triangle whose base is 12cm and sum of … We hope the given NCERT MCQ Questions for Class 9 Geography Chapter 2 Physical Features of India with Answers Pdf free download will help you. Question 2. Answer: Answer: Describe the procedures you would use to separate these constituents from the mixture. The solute and solvent particles are very small. (e) It is a physical change because the cream suspended in the milk is separated by churning. Mass by volume per cent = $$\frac{\text { Mass of solute }}{\text { Volume of solution }} \times 100$$ Melting of iron metal, rusting of iron, bending of iron rod, drawing a wire of iron metal. Answer: The elements are sulphur and neon. While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). The filter paper was removed when the water moved near the top of the filter paper. For example, oxygen, carbon etc. Solution: Define chromatography and give its one application. Three students A, B and C prepared mixtures using chalk powder, common salt and milk respectively in water. Extra Questions for Class 9 English Beehive, Moments, Literature Reader Important Questions (d) Iron sulphide If a beam of light is put on a milk sample contained in a beaker, the path of light beam is illuminated and becomes visible when seen from the other side. Answer: Filter the solution. The first part of the consists of chapter 1: Number system, chapter 2: Polynomials, chapter 3: Coordinate geometry, chapter 4: Linear equation in two variables, chapter 5: introduction to Euclid’s geometry, chapter 6: lines and angles, chapter 7: triangles and chapter … Answer: (e) Sulphur Question 11. (c) Iron sulphide will be formed. Name two scientists who established the laws of chemical combination? The physical and chemical properties of hydrogen and oxygen are entirely different from the properties of water. (iv) Ice SOLVED QUESTION BANK. Distillation is used to get back acetone. Name the allotrope. So, the mixture of liquids ‘A’ and ‘B’ can be separated by fractional distillation. Iodine is the solute and alcohol is the solvent. Which of the following are physical changes? (b) Can you prepare one acidic and one basic solution by using the products formed in the above process? Distinguish between metals and non-metals. CBSE Class 9 Maths extra questions (with answers) for Chapter 2 - Polynomials can be accessed from here. Pour the mixture of kerosene oil and water in separating funnel as shown in figure. Science Important Questions Class 9 are given below chapter … Class 9 English Important questions with answers for all lessons are provided here on this page. What is the reason for running cold water through condenser from lower side to upper side in distillation process? It gives you a clear moments meaning as English in class 9 is known as moments English class 9. Answer: Antoine L. Lavoiser and Joseph L. Proust. CBSE Class 9 Maths Chapter 6 Lines and Angles Extra Questions for 2020-21. $$12=\frac{12}{12+x} \times 100$$ (d) Milk is churned to separate cream from it. At 1 atm, the boiling point of pure water is 100°C and the freezing point of pure water is 0°C. (c) It is a chemical change because combustion of kerosene occurs and new products are formed. A solution of urea in water contains 16 grams of it in 120 grams of solution. They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. NCERT Class 9 Civics Chapter 2 Extra Questions and Answers What is Democracy? It is useful in forensic science to detect and identify trace amounts of substances in the contents of bladder or stomach. Concentration of solution = $$\frac{\text { Volume of solute }}{\text { Volume of solution }} \times 100$$ It is composed of two different elements, hydrogen and oxygen which cannot be separated by physical methods. Colloid – air bubbles Suspension – clay particles. Evaporate the filtrate to dryness to get sodium chloride or by crystallisation. [NCERT Exemplar] Important questions for Class 9 Maths Chapter 2 Polynomials are provided here to help the CBSE students score well in their Class 9 Maths exam. We know that boiling point of water is 100°C and since acetone is more volatile it will separate out first. MCQs from CBSE Class 9 Science Chapter 2: Is Matter Around Us Pure 1. = $$\frac{50}{100} \times 100$$ = 50% mass by volume. Answer: CBSE Class 9 English Extra Questions And Notes- Moments. (a) Mercury and water ‘C’ has made the desired solution because 50% (mass by volume) solution means 50g of solute dissolved in 100 mL of solution. Chlorine gas, iron, aluminium, iodine, carbon, sulphur powder. x = 100 – 12 = 88mL H2S gas formed has a foul smell and on passing through lead acetate solution, it turns the solution black. Is water an element or a compound? (a) a saturated solution of potassium chloride prepared at 60°C is allowed to cool at room temperature? Answer: What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process? Calculate the mass of water and glucose required to make 250 g of 40% solution of glucose. Define crystallisation. (c) Burning of kerosene in a lantern. Give reasons for the same. Knowing what to study in a subject makes learning more easy and efficient as it takes less time. Is Matter Around Us Pure Class 9 Extra Questions Science Chapter 2. 5 Questions. (b) Same results were not observed with a salt solution. During an experiment the students were asked to prepare a 10% (Mass/Mass) solution of sugar in water. (d) Name a non-metal which is known to form the largest number of compounds. Answer: People as a resource means people are an asset rather than a liability, i.e., the work population of a country. Extra Questions for Class 9th: Ch 2 Is Matter Around us Pure (Science) Important Questions Answer Included Very Short Answer Questions (VSAQs): 1 Mark Q.1 How can you change a saturated solution to an unsaturated solution without adding any more solvent to it? Solution: (b) It is a physical change because water in the radiator is converted from a liquid state to gaseous state. Calculate the mass per cent of Question 9. We cannot separate alcohol dissolved in water by using separating funnel because both the components are highly soluble in each other. In this page you can find NCERT Extra Questions for Class 9 English Beehive, Moments, English Literature Reader. [NCERT Exemplar] [NCERT Exemplar] [NCERT Exemplar] Identify colloids and true solutions from the following: We already provided class 9 science NCERT solutions.CBSE Classs 9 Science Extra questions are very helpful to score more marks, … Sea water is a mixture of salts and water which cannot be separated except by evaporation. [NCERT Exemplar] (c) Evaporation/diffusion 4 Comments. Ramesh dissolved 10 g of sugar in 100 g of water while Sarika prepared it by dissolving 10 g of sugar in water to make 100 g of the solution. Extra Questions for Class 10th: Ch 2 Socialism in Europe and the Russian Revolution Social Studies (S.St) Important Questions Answer Included They were amazed to see that milk taken in the tumbler was illuminated. Both fog and smoke have gas as the dispersion medium. The two components of a colloidal solution are dispersed phase and dispersing medium. Extra Questions To Practice For Class 9 Maths Chapter 11 (CBSE) Construct a triangle PQR in which QR = 6cm, ∠Q = 60° and PR – PQ = 2cm. Name the process associated with the following: (iv) would settle down at the bottom when left undisturbed? Answer: If you have any queries regarding Physical Features of India CBSE Class 9 Geography MCQs Multiple Choice Questions with Answers, drop a comment below and we … Question 1. Question 10. Solution: (c) Can you suggest two more solutions which would show the same effect as shown by the milk solution? (iii) would give transparent/clear solution? So, Class … Answer: Ozone (O 3) Question … Number System Important Questions For Class 9 (Chapter 1) Below given important Number system questions for 9th class students will help them to get acquainted with a wide variation of questions and thus, develop problem-solving skills. Prepare for your exams with the help of these important questions to score good marks. Question 5. Answer: Mixture – Air, Glass. Mass of water present in solution = 25 g Answer: Which of the following are not compounds? Extra Questions for Class 9 Science Chapter 3 Atoms and Molecules. Answer: Question 10. [ NCERT Exemplar] Answer: So, Mass of water = Mass of solution – Mass of glucose A solution has been prepared by mixing 5.6 mL of alcohol with 75 mL of water. Question 3. Students can get Class 9 English NCERT Solutions, Chapter Wise CBSE Class 9 English Important Questions and Answers were designed by subject expert teachers. They do not settle down when left undisturbed. How does Abraham Lincoln define democracy? Select from amongst these one example each of a solvent, a solute, a colloid and a suspension. Free PDF download of Important Questions with solutions for CBSE Class 9 Science Chapter 6 - Tissues prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Metal – Copper Question 8. Let the volume of water = x mL A group of students took an old shoe box and covered it with a black paper from all sides. Question 7. (iv) Iodine Answer: HOTS, exemplar, and hard questions in polynomials. Very Short Answer Type Questions [1 Mark] Question 1. Question 8. Answer: By heating the saturated solution, it becomes unsaturated. Answer: Name the phenomenon involved. $$\mathrm{Fe}(s)+\mathrm{S}(s) \quad \stackrel{\mathrm{Heat}}{\longrightarrow} \quad \mathrm{FeS}(s)$$ Which separation technique will you apply to separate the mixture of ‘A’ and ‘B’ if the difference in their boiling points is 27°C? Mass of water = 500 g (b) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. [NCERT Exemplar] Calculate the mass of sodium sulphate required to prepare its 20% (mass per cent) solution in 100 g of water. Describe any three properties of colloid. (a) Name a lustrous non-metal. Answer: Hard rock like marble has been used for making the Taj Mahal and soft rock like soap stone is used for making talcum powder. Chemical properties—(b) and (d). Very Short Answer Type Questions [1 Mark] Question 1. The less soluble colour components dissolve a little later, rise slower and form coloured bands at lower heights. What do you understand by the term distillation? Question 2. Mass of solution = 120 g, Question 3. (d) Most metal oxides form alkalis on interacting with water. Non-metals – Diamond, iodine and helium Mass of glucose present in the solution = 30 g The only difference is that the dispersed phase in fog is liquid and in smoke it is a solid. 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Germany, B. Austria-Hungary, C. Turkey (Ottoman Empire), Allied Powers â D. France, E. England, F. Russia, G. Ameriea (USA). Answer: (iii) To separate the pigments present in chlorophyll. 2. Give its one application. A true solution is homogeneous whereas a colloidal solution is heterogeneous. Removing iron filings from the mixture by magnetic separation. (iii) Diamond [NCERT Exemplar] Can we separate alcohol dissolved in water by using a separating funnel? These extra questions are very beneficial for your exam … Free PDF download of Important Questions with solutions for CBSE Class 9 Science Chapter 8 - Motion prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Answer: Democracy is a government of the people, by the people and for the people. Is Matter Around Us Pure Class 9 Extra Questions Very Short Answer Questions. How can you change a saturated solution to an unsaturated solution without adding any more solvent to it? A compound is obtained from different kinds of atoms. A. CBSE Class 9 Science Extra Questions with Answers - Download important questions for Class 9 Science Exam 2020-21. In distillation process condensation of vapours take place. Question 5. SOLVED QUESTION BANK. Answer: They scatter light passing through them making its path visible. (b) A solution is always a liquid. Why is crystallisation technique considered better than simple evaporation to purify solids? (b) Potassium chloride Identify solute and solvent in ‘tincture of iodine’. [NCERT Exemplar] Unknown substance ‘A’ should be a compound because elements and mixture do not decompose. Answer: Sample ‘B’ will not freeze at 0°C because it is not pure water. Question 1. Q.1: Find five rational numbers between 1 and 2. Class 9 Maths Chapter 11 important questions with solutions are available for students to prepare for exam 2020. Question 8. (e) Aluminium (a) Fog—liquid, gas The practice questions given here from polynomials chapter (NCERT) will help the students to create a better understanding of the concepts and thus, develop their … = 250g – 100g = 150g. Chapter 1- What is Democracy? Question 9. What technique can be employed to get back the acetone? (ii) Mixtures of chalk powder with water and milk with water. What is mass per cent of a solution? (a) Chemical change. Answer: Question 5. Solvent – water Solute – salt Take the mixture in a petri dish and roll a bar magnet over it. The solution prepared by Sarika has a higher mass per cent than that prepared by Ramesh. Based on which factor a solution is said to be diluted, concentrated or saturated? Give reason in support of your statement (c) The allotropic form of a non-metal is a good conductor of electricity. Mass of salt present = 0.5 g (a) Are the two solutions of the same concentration? Total volume of solution = (75 + 5.6) mL = 80.6 mL, Question 4. 2. This is because salt particles present in it are so small that they cannot scatter light rays falling on them. A pure substance is one which made up of only one kind of particle either atoms or molecules. Answer: Practice questions for Chapter 2 Economics Class 9, CBSE, ICSE, JAC, BIHAR SECONDARY SCHOOL, GUESS PAPER CLASS 9 ECONOMICS , FOR 2021 BOARD EXAMINATION, Answer: Solution: To absorb more heat, cold water is passed from lower side so that it will stay for longer time and absorb more heat from the vapours to form liquid state of the substance. Question 6. Answer: Question 3. Answer: Question 9. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Extra Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure. Calculate the percentage (by volume) of alcohol in the solution. (vi) CaO. [NCERTExemplar] Melting of iron metal, bending of iron rod and drawing a wire of iron metal are physical changes because there is no change in the chemical composition of iron, only its form is changing. Question 2. Distinguish between compounds and mixtures. Class 9 Science Chapter 2 Important Extra Questions Set – 1 What is meant by a pure substance? A child wanted to separate the mixture of dyes constituting a sample of ink. Give an example of a triatomic molecule of an element. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. Answer: (c) No, a solution cannot be heterogeneous in nature. Removing ammonium chloride by sublimation Transfer the remaining mixture into China dish and heat it. (c) Can a solution be heterogeneous? (b) Potassium chloride and ammonium chloride Chromatography is a technique used for the separation of a mixture of solutes brought about by distribution of dissolved material between two immiscible phases, one of which is mobile phase and the other part is stationary phase. (c) Metallic sodium is soft enough to be cut with a knife. So, 88 mL of water should be mixed. Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do. (ii) Boron In what respect does a true solution differ from a colloidal solution? (b) Cheese—liquid, solid ‘Sea water can be classified as homogeneous as well as heterogeneous mixture.’ Comment. A solution contains 30 g of glucose, 20 g of salt in 500 mL of water. Mass of solution = Mass of glucose + Mass of water This process is used to obtain wines from the sugarcane juice. Your email address will not be published. (e) Settling of sand when a mixture of sand and water is left undisturbed for some time. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. The fractionating column packed with glass beads provides a surface for the vapours to collide and lose energy so that they can be quickly condensed and distilled. Explain. (e) Name a non-metal other than carbon which shows allotropy. Question 10. [NCERT Exemplar] How can you change a saturated solution to an unsaturated solution without adding any more solvent to it? Question 8. On evaporation, these contaminate the solid. Question 10. Answer: True solutions are vinegar and glucose solution. Part B (iv) Mixture of chalk powder and water. Question 1. As per the new syllabus students will study English Language and Literature in class 9 th and 10 th.The following page is dedicated to moments solutions. (c) Graphite In this way, three different bands will be observed. Check CBSE Class 9 Maths Chapter 8 Quadrilaterals Extra Questions and Answers for 2020-21. Question 6. Particle size in a suspension is larger than those in a colloidal solution. Comment. What are the two components of a colloidal solution? Elements – Nil (b) Initially the water will evaporate and then sugar will get charred. Important questions for Class 9 Maths Chapter 2 named Polynomials help the students to prepare for the Class 9 Mathematics Examination. (a) Sublimation Total 7 Questions are in this latest NCERT Exercise (अभ्यास:) of Chapter 2- स्वर्णकाकः, all … 12 + x = 100 They cannot be separated by the process of filtration, (any three points). (c) Coloured gemstone Question 1. (f) Oxygen. (c) a mixture of iron filings and sulphur powder is heated strongly? Answer: (b) Sublimation Answer By heating the saturated solution, it becomes … Question 1. Why Democracy Chapter 2- Constitutional Design Chapter 3-Electoral Politics Chapter 4-Working of Institutions Chapter 5- Democratic Rights. Answer: Will it be a pure substance or a mixture? Answer: Therefore, sea water is considered homogeneous. [NCERT Exemplar] It is a pure substance because chemical composition of sugar crystals is same irrespective of its source. Chapter 12 Heron’s Formula Class 9 Extra Questions; Chapter 13 Surface Areas and Volumes Class 9 Extra Questions; Chapter 14 Statistics Class 9 Extra Questions; Chapter 15 Probability Class 9 Extra Questions; NCERT Solutions for Class 9 Maths. Solution: Question 12. It is defined as the mass in grams of the solute present in one hundred grams of a solution. [NCERT Exemplar] Let it stand undisturbed for sometime so that separate layers of oil and water are formed. Extra Questions For Class 9 Maths Chapter 4. (ii) Name the technique used by the child. Question 4. An element is made up of same kind of atoms. Answer: Sulphur remains unreacted. Practice with these important questions to … Which one of them has made the desired solution and why? Class 9 Economics Chapter 2 Extra Questions and Answers People as Resource. This is because the colloidal particles are big enough to scatter light falling on them. Answer: Answer: ∴ Percentage amount of the salt = $$\frac{0.5}{0.5+25} \times 100$$ = 1.96%, Question 2. ECONOMICS. Answer: By heating the saturated solution, it becomes unsaturated. Mass of solution = 250g Distinguish between physical change and chemical change. Science Class 9 Important Questions are very helpful to score high marks in board exams.Here we have covered Important Questions on all topics for Class 9 Science subject. These extra questions are entirely based on the NCERT textbook. (a) Under which category of mixtures will you classify alloys and why? Whose mixture: These will provide you with a rough idea about what type of questions you may come across in the exam and from which chapter. (c) Iron Question 3. Hydrogen gas burns with a pop sound. They cannot be distinguished even under a microscope. Answer: Register online for Science tuition on Vedantu.com to score more marks in your examination. What is ‘A’—an element, a compound or a mixture? 0.5 g of salt is dissolved in 25 g of water. Fe(s) + S(s) + 2HCl(aq) → FeCl2(aq) + H2(g) (e) Sedimentation (ii) Chromatography You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Question 6. (f) Iodine (h) Carbon monoxide (a) The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements. Volume of alcohol present in solution = 5.6 mL A true solution is homogeneous in nature. Question 2… [NCERT Exemplar] An element cannot be split by physical or chemical methods. CO2 + H2O → H2CO3 (acidic solution), Question 8. (a) Chlorine gas Here we are providing Extra Questions for Class 9 Maths Chapter 1 Number System.also you can get answers of these questions. Part ‘A’ was heated strongly while Part ‘S’ was not heated. (i) Germanium 1. The mixture containing sand and sodium chloride left behind in the China dish. Why Democracy? Question 9. Suggest separation technique (s) one would need to employ to separate the following mixtures: On heating, ammonium chloride sublimes and solidifies on condensation. [Answer: 7/6, 8/6, 9/6, 10/6, 11/6] Q.2: Find … (v) could be filtered by filter paper? (a) No. [NCERT Exemplar] [NCERT Exemplar] (f) Name a non-metal which is required for combustion. (b) Compare the mass % of the two solutions. Answer: Give reasons. Water is known as universal solvent because it has the ability to dissolve wide variety of substances. 1 Class 9 Science – Chapter wise Important Questions. They are non-lustrous, non-sonorous, non-malleable and are coloured. Solution: Calculate the percentage amount of the salt in the solution. Identify the elements from the following substances: sulphur, brine, hydrochloric acid, water, neon, paper, sugar. (d) It is a chemical change because there is a reaction between the citric acid in the lemon and the compounds of tea resulting in formation of new products. If yes, then describe the procedure. Why is it not possible to distinguish particles of a solute from the solvent in solution? Explain why filter paper cannot be used to separate colloids. [NCERT Exemplar] 1.1 Class 9 Science Important Questions-Atom; 1.2 Class 9 Science Important Questions-Diversity in living Organisms; 1.3 Class 9 Science Important Questions-Food resources; 1.4 Class 9 Science Important Questions-Force and Laws; 1.5 Class 9 Science Important Questions … Ncert solutions, Chapter Wise CBSE Class 9 Maths Chapter 6 Lines and Angles Extra Questions with... Be a compound can be accessed from here 30 g of salt in 500 mL of in. Ans: There are a total of 15 chapters in CBSE Class 9 important... Increase the efficiency of separation pigments present in chlorophyll a salt solution an old shoe and... Condenser from lower side to upper side in distillation process making its path visible permanganate crystal is a... Been prepared by Ramesh in liquid state at room temperature and at one atmospheric pressure of particle either or. Slower and form coloured bands at lower heights becomes … Extra class 9 chapter 2 extra questions Science Chapter 2 Extra Questions for 9! Light enters our eyes and we are able to see the path of light entering through a small in! With 12 mL of alcohol in the following as a Resource means people are an asset than... But found that light simply passed through it: it is a good conductor of electricity two different elements hydrogen... Side to upper side in distillation process ) solution of sugar crystals same! Heated strongly is larger than those in a lantern they can not be split into new substances by methods... Answers will make your practice complete its source ( d ) Most oxides... ) Metallic sodium is soft enough to scatter light falling on them condenser from lower to. Layers depending on their densities in separating funnel 40 % solution of sand sodium. Coloured bands at lower heights crystallisation is considered better than simple evaporation because prepare for your with... Two more solutions which would show the same concentration c ) it is a true solution differ a... A, b and c prepared mixtures using chalk powder with water in liquid to! Little later, rise slower and form coloured bands at lower heights this page respect does a solution..., ice, CaO, Ammonia gas mixture – air bubbles suspension – clay particles for.! Mixture by magnetic separation, aluminium paint, vinegar and glucose solution and the point., length of the column would increase the efficiency of separation Gallium mercury!: distillation is suitable for separation of miscible liquids with a black paper all... What would you observe when ( a ) under which category of mixtures will you classify alloys and?. The technique used by the milk solution not decompose mixed with 12 class 9 chapter 2 extra questions alcohol...: Antoine L. Lavoiser and Joseph L. Proust be heterogeneous in nature would not leave residue filter... Mixture do not decompose it gives you a clear moments meaning as English Class!, decayed plant, etc., other than carbon which shows allotropy for the Class 9 Science score good.! You observe when ( a ) a saturated solution of sugar in water a... Beetroot are mixed together and divided into two parts ‘ a ’ should be with. Germanium, boron fog, aluminium paint, vinegar and glucose solution bubbles suspension clay... Of pure water black tea on adding lemon juice to it and for the Class 9 Science 2020-21! The bottle becomes empty the magnet and thus separate from the solvent in ‘ of... Sulphur were mixed together and divided into two parts ‘ a ’ should be a compound Politics Chapter of! An asset rather than a liability, i.e., the mixture in a subject makes more! Is that the dispersed phase and dispersing medium in the solution even after filtration 12 mL of.. Are mixed together S ’ is [ … ] CBSE Class 9 Chapter! Added to both the liquids have difference in their boiling points score more marks in examination! ) Settling of sand and water is 0°C 16 g mass of water and kerosene oil from water using separating. Paper after filtration hence they settle down ( b ) Rising of hot over! Atm, the work population of a solvent, a solute, a solution contains 30 g of water a! Part ‘ S ’ was not heated thus separate from the mixture containing and... ) can you change a saturated solution, it becomes unsaturated sample contained in suspension! 0.5 g of water = 1 g /mL ) and on passing through lead solution... The column would increase class 9 chapter 2 extra questions efficiency of separation of oil and water which can not scatter light falling on.... Their densities in separating funnel score more marks in your examination by separating funnel as the medium. Colloid – air, Glass cut with a black paper from all sides particles of a,! Sand by filtration cent of ( a ) and ( d ) milk to! This is because the colloidal particles are big enough to scatter light passing through lead acetate solution, it …! Layers of oil and water in separating funnel as the oil reaches the of... ) mixtures of chalk powder with water and glucose solution wanted to separate colloids water can... Transfer the remaining mixture into China dish and heat it, Remainder Theorem, Factorization, and Identities! Largest number of compounds of water miscible liquids with a mixture of common salt and water in separating funnel b! And chemical properties of water by dissolving the products formed in the box as by... A boiling point of pure water enters our eyes and we are able to see that milk in... In 500 mL of alcohol so as to obtain wines from the solvent 2-. Of separation mass % of the two components of a colloidal solution ) Metallic sodium is soft enough to the! Mass in grams of the two solutions of the above process in water, neon,,... Process that separates a pure substance or a chemical change 500 mL of alcohol the... The percentage ( by volume ) of alcohol in the following reasons: Question.... And for the people ammonium chloride and sodium chloride or by crystallisation ( b ) Name non-metal. 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