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The colour of the crystals changes due to the formation of ferric oxide. A. 10. Self Test-5. Whereas in a double displacement reaction, there are two exchanges of ions between compounds resulting in two new compounds. C) Yellow. Important Questions For Cbse Class 10 Science Chapter 1 Chemical (vi) 3H2 (g) + N2 (g) → 2NH3 (g) Extra Question Answers Class 10th Ch-1 (Chemical Reaction and Equations). Here we have covered Important Questions on Chemical Reactions and Equations for Class 10 Science subject. A) Black. What is electrolytic decomposition? Write the balanced chemical equation for the following reaction and identify the type of reaction and define it. Your email address will not be published. To learn more about important questions in Chemical Reactions and Equations Class 10, register with BYJU’S. (i) State the colour of ferrous sulphate crystals both before heating and after heating. 2H2 (g) + O2 (g) → 2H2O (I) Science Important Questions Class 10 are given below. Answer: (a) In electrolysis of water (H2O), the hydrogen goes to one test tube and oxygen goes to another. Chemical Reactions and Equations Chapter Wise Important Questions Class 10 Science NCERT Solutions Sample Papers NCERT Exemplar Solutions . Consider the chemical equation given below and answer the questions that follow: (i) Name the substance which is getting oxidised. If the unbalanced chemical reaction is not given, use the components of the chemical reaction that are mentioned and write down the skeletal equation. (b) Choose a metal from the following metals which reacts only with hot water: Sodium, magnesium, iron. A compound used for whitewashing is. (c) Carbon dioxide is passed through lime water. During combustion the coal burns in air to form CO2, H22 along with the evolution of heat. If the number of atoms on the reactant side is not equal to the number of atoms on the product side, then we can confirm that the equation is not balanced. Question 2. Your email address will not be published. Let us consider the example of an electrochemical cell-like redox reaction between Zinc and Hydrogen. Answer: Iron when in contact with air moisture or water, corrodes and forms rust. We hope the given KSEEB SSLC Class 10 Science Solutions Chapter 1 Chemical Reactions and Equations will help you. Free Question Bank for 10th Class Science Chemical Reactions and Equations Chemical Reactions and Equation Chemical equation will not tell if the final product would have color change or discoloration. One such case would be sodium chloride. 1.“We need to balance a skeltal chemical equation.” Give reason to justify the statement. Rust can be termed with the chemical formula of Iron Oxide with its general form formula being Fe2O3.nH2O. Oxidising agent = MnO2 answer: CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. Identity X and also write the chemical reaction involved. Answer: It means a balanced chemical equation has equal masses of various elements in reactants and products. How is exothermic reaction different from an endothermic reaction? (iii). The oxidizing agent supply the oxygen in a … Find all questions & answers on the chapter with detailed explanation chemical equations & more@learnfatafat.com (b) Balance the chemical equation given below: (iii) Write the chemical equation of the reaction taking place. (ii) Dil HNO3 cannot be kept in aluminium container because aluminium metal reacts with dil HNO3 to form aluminium nitrate and the hydrogen liberated in this reaction is oxidised to water and nitric acid itself is reduced to any of the oxides of nitrogen. A white precipitate of BaSO 4 is formed in the reaction. This will clear students doubts about any question and improve application skills while preparing for board exams. Answer. (iii) Name the oxidising agent. Question 1. (Displacement reaction), (iii) ZnCl2 solution also cannot be kept in aluminium container because Al is more reactive than Zn, therefore more reactive Al displaces less reactive Zn from its solution (ZnCl2). Answer. (i) it does not react with cold as well as hot water but reacts with any other physical state of water, (b) addition of hydrogen. 2 g of ferrous sulphate crystals are heated in a boiling tube. It is a combination reaction because in this reaction two substances combine to form a single substance. How many number of sodium bromide molecules obtained in the balanced chemical equation. Out of these solutions which solution, can be kept in the aluminium container? Wherein C & B are pure elements and are exchanged forming 2 compounds with A. Identify the type of reaction in the following example: Ch 1 - Chemical Reaction (Assertion Type Reasoning Quiz) 5. (i) Digestion of food in stomach. Quick lime. Like if we want to make tea, we add sugar, tea, milk and water. When limestone is heated strongly, it breaks into CO2 and lime. For example, the barium ions (Ba2+) of barium chloride react with sulphate ions (SO42-) of sodium sulphate to form barium sulphate (Ba2+ SO42- or BaSO4). Consider the example of the neutralization reaction between Hydrochloric acid and Sodium Hydroxide giving out sodium chloride(Common Salt) and water. An oxidizer is a chemical a fuel requires burning, generally oxygen. (v) Fe2O3 + 2Al → Al2O36 + 2Fe … Important Questions For Class 10 Science Chapter 1 Chemical. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of Sulphuric Acid in the reaction. Ans: The process of decomposition of any molecule using electricity is termed as electrolytic decomposition. Ch 6 - Life Processes - Assertion Reasoning Type Questions 4. Consider 4 elements A, B, C & D. In a single displacement reaction, the mechanism would be as follows. After some time it is observed that white silver chloride turns grey. This video is highly rated by CBSE/Schools students and has been viewed 2 times. Question 1. (ii) Name the substance which is getting reduced. Reducing agent = CO, (c) Practice Now. D. Limestone. (a) 3MnO2 + 4Al → 3Mn + 2Al2O3 Answer: From the question, we infer the unbalanced chemical equation is: Br 2 + Na 2 CO 3 → NaBr + NaBrO 3 + CO 2 Balanced equation is: 3 Br 2 + 3 Na 2 CO 3 → 5 NaaBr + NaBrO 3 + 3 CO 2 It means 5 molecules of NaBr are obtained. Here, an acid and a base, Hydrochloric acid and Sodium Hydroxide react in a neutralization reaction to produce Sodium Chloride(Common Salt) and water as the products. April 16, 2020 March 10, 2020 by Shyamjee Mishra Extra Question Answers Class 10th Ch-1: After Completing NCERT Question/Answers it is very Compulsory to learn the Extra Questions of that particular Chapter Especially in Science. (b) Mention the colour of : (2 marks). Register online for Science tuition on Vedantu.com to score more marks in CBSE board examinations. 8. Write the chemical equation to justify your answer. Zinc + Sulphuric acid → Zinc sulphate + Hydrogen (iii) When green coloured ferrous sulphate is heated strongly, it decomposes to form brown coloured ferric oxide. (v) Copper (II) oxide reacts with dilute hydrochloric acid. What is the difference between single displacement and double displacement reactions with the help of suitable examples to help solve the same (3 marks). The deep blue colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate. (vi) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is formed. Write the balanced chemical equation for the following reactions:  (2014) How do we balance a chemical equation? (iv) Combination reaction Here you can get Class 10 Important Questions Science based on NCERT Text book for Class X. Ans: Nitrogen is an inert gas and thus does not react with fats and oils present in food substances. Free PDF download of Important Questions with solutions for CBSE Class 10 Science Chapter 1 - Chemical Reactions and Equations prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Question 1. Likewise, if you add a spoon of curd to lukewarm milk and keep it aside for few hours, then the whole milk turns into curd. Iron displaces Cu from copper sulphate solution as iron is more reactive than copper. (a) addition of oxygen. Free PDF download of Important Questions with Answers for CBSE Class 10 Science Chapter 1 – Chemical Reactions and Equations prepared by expert Science teachers from latest edition of … The chemical equation does not give any information regarding the speed of reaction. Is magnesium being oxidised or reduced in this reaction? Oxidation is a process which involves. In this article, you will get the MCQs from Chapter 1 - Chemical Reactions and Equations of CBSE Class 10 Science. So, students who are having trouble finding the right approach to questions given in Class 10 Science NCERT Chapter 1, Chemical Reactions and Equations, can see the answers given here for reference. Question 1. Solved the very best collection of Chemical Reactions and Equations Class 10 Science Important Questions and Answers Chapter 1 Pdf from the latest NCERT edition books, It will help you in scoring more marks in CBSE Exams. Name a metal for each case: Sodium Chloride dissociates at high temp but breaks apart easily on electrolytic decomposition. B. Slaked Lime. BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2 NaCl (aq). Why are oil and fat containing food items flushed with nitrogen? When fats and oils are oxidised, they become rancid and their smell and taste changes. (iii) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas having smell of burning sulphur is evolved. Oxidising agent = Fe2O3 Answer: Chemical Reactions and Equation. Question 4. A smell of burning sulphur is also obtained due to the formation of sulphur dioxide. (iii) CaO + H2O → Ca(OH)2 (2012) Pre Foundation Question banks are helpful for students aspiring for NTSE, Olympiad, KVPY, IIT JEE, Medical and other engineering and competitive exams. (b) Fe2O3 + 3CO → 2Fe + 3CO2 (iv) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and blue colour of copper sulphate solution fades away. Why are oil and fat containing food items flushed with nitrogen? (v) CaO (s) + H2O (l) → Ca(OH)2 (i) Substance oxidized = H2 (Hydrogen gas) Question 1. The arrow sign (→) pointing towards the right hand side is put between the reactants and products. (2014) Silver bromide also decomposes to silver and bromine by light. (ii) This is a double displacement reaction. Sometimes, the chemical equation also do not give the concentration of the substances, this is why terms like concentrated and diluted are used. (2014) (i) CH4 + 2O2 → CO2 + 2H2O a) Redox reaction: A REDuction-OXidation reaction is a reaction in which there is a transfer of electrons between chemical species. Calcium oxide reacts vigorously with water to form Calcium hydroxide (slaked lime). Quicklime is used extensively in the process of creating cement. The displacement reaction of iron (III) oxide with aluminium is known as thermite reaction. Characterised by the formation of precipitate. This displacement reaction occurs because iron is more reactive than copper. (iv) Name the reducing agent. Question 4. Thus packing oil and fatty foods with nitrogen and fatty foods will help to sustain the quality of the food for longer by removing the oxygen before packing. For example: An inert gas such as nitrogen is added to prevent the packed chips from getting oxidised. Question 15. These Solutions are part of HOTS Questions for Class 10 Science. In this displacement reaction, two compounds – barium chloride and sodium sulphate react to form two new compounds barium sulphate and sodium chloride. Answer: Important questions for class 10 science chapter 1 chemical cbse hots question reactions and equations ncert solutions pdf test identification a do not write on this solved report sheet m exemplar solution part ii. Examples of an exothermic reaction are rusting iron, settling, chemical bonds, explosions, nuclear fission whereas some examples of an endothermic reaction are melting ice, evaporation, cooking, gas molecules, photosynthesis. 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Ans: Balancing a chemical reaction is mandatory and required to understand the ratios involved in the action of a chemical reaction. The balanced chemical equation is: 2Mg(s) + O 2 (g) 2MgO(s) Yes, magnesium (Mg) gets oxidised to form magnesium oxide (MgO) in this reaction. We hope the given MCQ Questions for Class 10 Science Chemical Reactions and Equations with Answers will help you. (2013) Consider the example of the decomposition of calcium carbonate giving out CaO (Quick Lime) which is a major component of cement. It is first white in colour. Answer: CBSE Class 10 Science Chapter-1 Chemical Reactions and Equations Important Questions – Free PDF Download. (b) Identify the oxidising agent, reducing agent in the following reaction. Q5. Get Free NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions And Equations. (a) When barium chloride solution is added to sodium sulphate solution, then a white precipitate of barium sulphate is formed along with sodium chloride solution: It is an example of a double displacement reaction. (ii) Pb (s) + CuCl2 (aq) → PbCl2 (aq) + Cu (s) (2013) (2017D) This phenomenon is called rancidity. Answer: (a) x → (s); y → (aq); (b) x → 2Ag. Answer: When silver bromide is exposed to light, it decomposes to form silver metal and bromine (2015) Observations: Question 7. Answer: The application of this is when we need to separate molecules which dissociate at high temperatures. (ii) Burning of natural gas. (iii) Write a balanced chemical equation to represent the above reaction. Answer; Answer: The best ways to excel in school exam as well as in JEE & NEET is to practice questions good questions , entrancei prepared question bank for class 10 students in chapter Chemical Reaction And Equation get Exercise-1 in this page Also a brown substance will be deposited on the iron nail. Also See : CBSE Class 10 Science Syllabus 2019-2020 Session Video | EduRev is made by best teachers of CBSE/Schools. This is the addition of oxygen. Al2O3 + NaOH → NaAlO2 + H2O (2013) Answer: The water molecule formed is by the combination of OH– ions and H+ ions. C. Blue vitriol. Now place this china dish in sunlight for some time. (b) What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails in copper sulphate solution for about half an hour? Science Class 10 Important Questions are very helpful to score high marks in board exams. (a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? Question 1. (v) Displacement reaction Question 2. We conclude that they thoroughly mix with each other and form a new substance. Write the balanced chemical equation for the following reaction and identify the type of reaction and define it. Now take note of how many atoms are on each side of the reaction of each element. (ii) Combustion of coal in air b) Neutralization reaction: It is basically the reaction between an acid and a base giving salt and water as the products. Required fields are marked *, Chemical Reactions And Equations Class 10 Questions Answers. When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. MCQ Questions for Class 10 Science Chemical Reactions and Equations with Answers. Identify ‘X’, ‘Y’ and ‘Z’. On heating, it turns into tea. Here, the compound Calcium carbonate when heated breaks down into Calcium Oxide and Carbon Dioxide. 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Considering the case of a double displacement reaction: 4. This substance is nothing but copper metal. Question 10. (i) Decomposition reaction Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 10 Chemistry Chemical Reactions and Equations. (i) Digestion of food in stomach Answer: In this reaction, Cu is changing into CuO. Reducing agent = H2S. Substance oxidised = H2S (a) Consider the example of combustion of magnesium metal. (iii) Double displacement reaction The entire NCERT textbook questions have been solved by best teachers for you. The substances which combine or react are known as reactants. Keep notice to balance oxygen and hydrogen atoms last as they are present in a variety of compounds and trying to fix that ratio first will complicate things further. Putting the symbols and formulae of all the substances in the above words gives equation, Question 8. Answer: Question 6. Class 10 Answerkey for Chemical Reaction and Equation. This thorough mixing is a chemical reaction. The new substances produced in a reaction are known as products. Since water (H2O) consists of 2 parts of hydrogen and 1 part of oxygen, so, the volume of hydrogen gas (H2) collected over cathode (negative electrode) is double the volume of oxygen gas (O2) collected over anode (positive electrode). Take about 2 g silver chloride in a china dish. Ans: Corrosion is the natural process by which a naturally pure metal converts into a more stable form of itself like sulphide, hydroxide or oxide. Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reaction: Therefore it is a type of decomposition reaction. (a) A substance X, an oxide of a metal, is used extensively in the cement industry. (ii) On heating copper powder in a china dish, the surface of copper powder becomes black. Select (i) combination reaction (ii) decomposition reaction and (iii) displacement reaction from the following chemical equations:   (2014) (iv) H2 (g) + Cl2 (g) → 2HCl (g) d) Combustion reaction: A combustion reaction is a reaction with a combustible material with an oxidizer to give an oxidized product. Mention the products formed during the reaction. (vii) Decomposition reaction. (i) NaOH solution is heated with zinc granules. Question 10. (i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas. Ans. Thus it is a type of thermal decomposition reaction. Suggest one method to prevent it. State the physical conditions of reactants in which reaction between them will not take place. State the kind of chemical reactions in the following examples:  (2014) MCQ Questions for Class 10 Science Chemistry with Answers PDF Download Chapter Wise. (b) (i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube? (vi) Combination reaction Certain changes in energy in the environment have to be made of heat, light or electricity breaking bonds of the compound. Thus, it is a type of exothermic decomposition reaction. Rules for writing a chemical equation: For example: Ch 1 - Chemical Reactions & Equations (MCQs) 6. In this reaction, one substance is splitting up into three substances so this is a decomposition reaction. (iii) Heating of limestone So this is an oxidation reaction. (2014) It is a displacement reaction which is highly exothermic. CBSE Class 10 important questions answers. Write the balanced chemical equation with the state symbols of the following reaction: Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and the solution of Sodium chloride. (b) Magnesium reacts with hot water to form Magnesium hydroxide and hydrogen. Substance reduced = Fe2O3 Skeltal chemical equation are unbalanced. This contradicts the law of conservation of mass, thus we must balance the chemical reaction. Prevention from rancidity. Q3- When a magnesium ribbon is burnt in air, the ash formed is. In this reaction, barium sulphate is formed as a white, insoluble solid which separates out suddenly from solution. The subscript of an element represents the rate of the number of atoms. The pre foundation courses offered by us are prepared by best faculties from all over India. (iii) Heating of limestone. 1. Students can solve NCERT Class 10 Science Chemical Reactions and Equations Multiple Choice Questions with Answers … Be noted when Balancing a chemical reaction involved in the laboratories Questions with Answers chemical Reactions Equations. 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So that they can score well in the following Questions: ( i Name... The type of exothermic decomposition reaction in which there is a double displacement reaction two... Each element heating sulphur dioxide ( SO2 ) and sulphur trioxide ( SO3 are... Electricity is termed as electrolytic decomposition document is highly rated by Class 10 Science Cu is into. Following statements: ( 2014 ) answer: ( i ) Name substance. Equations chemical Reactions and Equations ) is broken into simpler form of creating.... Reaction are known as reactants equation. ” Give reason to justify the statement – Free PDF Download CBSE... Case with oxygen is different as it renders the metal is produced in a china dish the... 10Th Ch-1 ( chemical reaction, two compounds – barium chloride and sodium chloride ( Common )... Lime is used as a white substance magnesium oxide chloride turns grey: CBSE Class 10 Science 1! Name the substance which is getting oxidised cement industry solid calcium oxide has multiple.! Equations chemical Reactions and Equations 3 Marks Coolgyan Org water molecule formed is during digestion, the compound calcium when... Also obtained due to the formation of sulphur dioxide form formula being Fe2O3.nH2O of large amount of heat Reactions Equations! Understand the ratios involved in the following reaction and also mention the colour of the reaction each! Which light is used to decompose a reactant metal as it renders the metal as it food... Cbse/Schools students and has been viewed 2 times Chemistry notes the right side... Fields are marked *, chemical Reactions and Equations chemical Reactions and Equations with Answers iron... Science Solutions Chapter 1 chemical Reactions and Equations with Answers have to made. Metallic character change or discoloration Quiz ) 5 given diagram and answer the Questions follow... 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