A decomposition reaction may be defined as the reaction in which a single substance decomposes or splits into two or more substances under suitable conditions. (d) What is the colour of the precipitate left behind in the last case? Describe an activity to illustrate such a reaction by heating. For example, decomposition of calcium carbonate is not a redox reaction. (i) it does not react with cold as well as hot water but reacts with any other physical state of water, (vi) Combination reaction (i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas. 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. Reducing agent = H2S. (i) CH4 + 2O2 → CO2 + 2H2O Antioxidants are added to food containing fats and oils to prevent them from oxidation. Substance oxidised = CO Describe an activity to show the decomposition reaction of ferrous sulphate in the laboratory. Q-If 100g of water is decomposed, how many grams of oxygen and hydrogen are obtained? (b) (i) When potassium iodide solution is added to lead nitrate solution, then a yellow precipitate of lead iodide is produced along with potassium nitrate solution. This is a double displacement reaction as two compounds react to form two new compounds. (ii) Pb (NO3)2 + 2KI → PbI2 + 2KNO3 Black and white photography depends on a few skills and chemical reactions. Rules for writing a chemical equation: For example: Putting the symbols and formulae of all the substances in the above words gives equation, Question 8. Question 9. According to law of conservation of mass, “Matter can neither be created nor destroyed in a chemical reaction Therefore the chemical equations are balanced to satisfy the law of conservation of mass in chemical reactions. (v) Fe2O3 + 2Al → Al2O36 + 2Fe Reducing agent = Al, (b) When silver chloride is exposed to sunlight, decomposition of silver chloride takes place. Suggest one method to prevent it. (iii) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas having smell of burning sulphur is evolved. Answer: In this reaction, Cu is changing into CuO. Substance reduced = Fe2O3 Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. Mention the products formed during the reaction. Decomposition reaction is one where a single reactant breaks down into one or more new products or elements. When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. 0 ; ... 2AgCl ==> 2Ag + Cl 2. the above reaction is an example of decomposition which is used in photography. (v) CaO (s) + H2O (l) → Ca(OH)2 (a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? Substance oxidised = H2S Question 2. name these gases? (a) In black and white photography AgBr gets decomposed due to light and forms silver metal and bromine gas. you may have logged in from another location. (iii) Dilute sulphuric acid reacts with sodium carbonate. Question 14. What happens chemically when quick lime is added to water? Question 5. Represent this in the formof a balanced chemical equation, Q)when potassium chlorate is heated in the presence of manganese dioxide catalyst it decomposes to form potassium chloride and oxygen gas . Sir , 2FeSO4  = Fe2O3 + SO2 +SO3 Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction. Why are decomposition reaction are called opposite of combination reaction? (a) ‘X’ is Calcium oxide (CaO). After some time it is observed that white silver chloride turns grey. On treatment with water it forms a solution which turns red litmus blue. Write the balanced chemical equation for the reaction and also mention the type of reaction. (iii). pse define how do we make equation ie. Copyright Notice © 2020 Greycells18 Media Limited and its licensors. answer: (v) Quicklime reacts vigorously with water releasing large amount of heat. Answer: Answer: Kerala Syllabus 9th Standard Physics Solutions Guide, Kerala Syllabus 9th Standard Biology Solutions Guide, Class 10 Science Chapter 1 Important Questions with Answers Chemical Reactions and Equations, Chemical Reactions and Equations Class 10 Important Questions Very Short Answer Type, Chemical Reactions and Equations Class 10 Important Questions Short Answer Type I, Chemical Reactions and Equations Class 10 Important Questions Short Answer Type II, Chemical Reactions and Equations Class 10 Important Questions Long Answer Type, Ekarthak Shabd in Hindi | एकार्थक शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Tatsam Tadbhav Shabd in Hindi | तत्सम तद्भव शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Shabd Vichar in Hindi | शब्द विचार की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Kriya Visheshan in Hindi | क्रिया विशेषण की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Paryayvachi Shabd in Hindi | पर्यायवाची शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Anek Shabdon Ke Liye Ek Shabd in Hindi | अनेक शब्दों के लिए एक शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Chhand in Hindi | छन्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Anekarthi Shabd in Hindi | एकार्थक शब्द की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Vilom Shabd in Hindi | विलोम शब्द (Antonyms) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Samvaad Lekhn in Hindi(Dialogue Letter)-संवाद-लेखन, Vismayadibodhak in Hindi | विस्मयादिबोधक (Interjection) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Samuchchay Bodhak in Hindi | समुच्चयबोधक (Conjunction) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Sambandh Bodhak in Hindi | संबंधबोधक (Preposition) की परिभाषा एवं उनके भेद और उदाहरण (हिन्दी व्याकरण), Patra lekhan in Hindi – पत्र-लेखन (Letter-Writing) – Hindi Grammar, ‎हिन्दी निबंध – Essay in Hindi Writing- Hindi Nibandh. The new substances produced in a reaction are known as products. (i) Aluminium (Al) during the reaction of some metal with dilute hydrochloride following observations were make: Fe2O3 (s) + 2Al (s) → 2Fe (l) + Al2O3 (l) + Heat. 2kclo3 on Mno2 gives 2kcl + 3O2 return with Heat is which reaction. (c) Carbon dioxide is passed through lime water. (2012) All the decomposition reactions are not redox reactions. (i) The colour of the ferrous sulphate crystals is green before heating and changes to brown after heating. These two reactions are used in black and white photography. Identity X and also write the chemical reaction involved. Question 4. ii. Oxidising agent = Fe2O3 Answer: (2014) Out of these solutions which solution, can be kept in the aluminium container? (vi) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is formed. If others acids are oxidizing agent then why then liberate H2 ? This phenomenon is called rancidity. Question 5. regards, The conversion of calcium hydroxide into calcium carbonate is which type of reaction? The method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as a chemical equation. Answer: We're sorry, but this browser is not supported by TopperLearning. (a) dilute sulphuric acid reacts with aluminium powder Answer: This displacement reaction occurs because iron is more reactive than copper. Please log in again! Give the chemical equations (balanced) for the following: (1) Reaction used in black and white photography. Answer: (b) Fe2O3 + 3CO → 2Fe + 3CO2 The substances which combine or react are known as reactants. Now place this china dish in sunlight for some time. Newsletter : Get latest updates in your inbox. (i) State two observations made in the experiment. Name a compound that is used in black and white photography. It is first white in colour. (i) Solid calcium oxide was taken in a container and water was added to it. All rights reserved. The chemistry of black & white photography. State the physical conditions of reactants in which reaction between them will not take place. Answer: (iii) Heating of limestone. When limestone is heated strongly, it breaks into CO2 and lime. (c) Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. When light falls on pale yellow coloured silver bromide, it changes to greyish white due to the formation of silver metal. Question 1. Question 2. Question 3. (i) NaOH solution is heated with zinc granules. Answer: Both silver chloride and silver bromide are used in black and white photography. Reducing agent = CO, (c) Answer: It’s just a process of remembering which bottle is which. The arrow sign (→) pointing towards the right hand side is put between the reactants and products. (v) Displacement reaction (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). It is a displacement reaction which is highly exothermic. (ii) Substance reduced = CuO (Copper oxide). Answer: An exchange of ions takes place in this reaction.

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