Compound B, with the same components of A are (ii) Combustion of coal in air (v) Fe2O3 + 2Al → Al2O36 + 2Fe (vii) Decomposition reaction. Calcium oxide reacts vigorously with water to form Calcium hydroxide (slaked lime). Answer: Question 11. 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. The reaction that makes black and white photography possible is called decomposition reaction. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. When KClO3 is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. Write the balanced chemical equation for the reaction and also mention the type of reaction. Describe an activity to show a decomposition reaction in which light is used to decompose a reactant. Answer: (iii) Heating of limestone. To prevent the decomposition of silver bromide, it is stored in dark bottles in the laboratories. This displacement reaction occurs because iron is more reactive than copper. (i) Digestion of food in stomach. (ii) Pb (s) + CuCl2 (aq) → PbCl2 (aq) + Cu (s) 2 g of ferrous sulphate crystals are heated in a boiling tube. Question 14. Why are decomposition reaction are called opposite of combination reaction? (a) Identify A, B and C (i) Substance oxidized = H2 (Hydrogen gas) (i) CH4 + 2O2 → CO2 + 2H2O Black and white photography depends on a few skills and chemical reactions. Fe2O3 (s) + 2Al (s) → 2Fe (l) + Al2O3 (l) + Heat. Thus, it is a type of exothermic decomposition reaction. (vi) 3H2 (g) + N2 (g) → 2NH3 (g) It is a displacement reaction which is highly exothermic. Question 1. Answer: Question 12. Silver bromide also decomposes to silver and bromine by light. (ii) Substance reduced = CuO (Copper oxide). The above reaction is used in black and white photography. 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. Why are decomposition reactions called opposite of combination reactions? (b) Choose a metal from the following metals which reacts only with hot water: Sodium, magnesium, iron. (c) The phenomenon is rancidity. when potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. Question 4. The new substances produced in a reaction are known as products. Give an example of a decomposition reaction. When silver bromide is exposed to light, it decomposes to form silver metal and bromine (i) NaOH solution is heated with zinc granules. 2FeSO4 = Fe2O3 + SO2 +SO3 (a) dilute sulphuric acid reacts with aluminium powder Oxidising agent = Fe2O3 Represent this in the form of balanced chemical equation. Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reaction: Reducing agent = Al, (b) (iii) CaO + H2O → Ca(OH)2 The deep blue colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate. (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. (2013) Reducing agent = CO, (c) It means a balanced chemical equation has equal masses of various elements in reactants and products. (b) When iron nails are dipped in copper sulphate solution, then iron sulphate solution and copper metal are formed: In this reaction, iron displaces copper from copper sulphate solution. (iii) The process of respiration. Are all decomposition reactions endothermic and are all combination reactions exothermic? This phenomenon is called rancidity. Therefore it is a combination reaction which is exothermic. Now place this china dish in sunlight for some time. Answer: Write the balanced chemical equation for the following reactions: (2014)
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