(iii) NaBr (aq) + AgNO3 (aq) → AgBr (s) + NaNO3 (aq) In black and white photography AgBr gets decomposed due to light and forms silver metal and bromine gas. Answer: During combustion the coal burns in air to form CO2, H22 along with the evolution of heat. 2 g of ferrous sulphate crystals are heated in a boiling tube. This substance is nothing but copper metal. These two reactions are used in black and white photography. The displacement reaction of iron (III) oxide with aluminium is known as thermite reaction. This is due to the decomposition of silver chloride into silver and chlorine by light. This arrow indicates that the substances written on the left hand side are combining to give the substances written on the right hand side in the equation. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. (vii) Decomposition reaction. (i) Aluminium (Al) Write the chemical equation to justify your answer. (ii) During heating sulphur dioxide (SO2) and sulphur trioxide (SO3) are produced. (a) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? (d) What is the colour of the precipitate left behind in the last case? Name the type of reaction taking place. (2012) Question 4. Please log in again! Write the balanced chemical equation for the following reactions:  (2014) Question 1. (ii) What type of reaction is this? Traditional black and white photography utilized a chemical process that has been observed since ancient times – that of the photo-sensitivity of silver (Ag) compounds. These reactions require energy either in the form of heat, light or electricity for breaking down the reactants. when potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. The arrow sign (→) pointing towards the right hand side is put between the reactants and products. Give the chemical equations (balanced) for the following: (1) Reaction used in black and white photography. (i) Decomposition reaction Question 1. (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. Your session has expired for security reasons or. (ii) Combustion of coal in air name these gases? Write chemical equation of the reaction and state its one use. Answer: In this reaction, Cu is changing into CuO. (b) Identify the oxidising agent, reducing agent in the following reaction. BaCl2 is added.to Na2SO4 solution, Differentiate between decomposition and combination reaction, I COULD NOT UNDERSTAND THE CHEMICAL EQUATION- Newsletter : Get latest updates in your inbox. Describe an activity to show the decomposition reaction of ferrous sulphate in the laboratory. Al2O3 + NaOH → NaAlO2 + H2O (2013) Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reaction: This is the addition of oxygen. Substance oxidised = CO When silver chloride is exposed to sunlight, decomposition of silver chloride takes place. Answer: (ii) Substance reduced = CuO (Copper oxide). (i) Digestion of food in stomach (ii) This is a double displacement reaction. Sir , When silver chloride is exposed to sunlight, photolytic decomposition reaction takes place i.e the decomposition reaction carried out by sunlight . Question 1. (iii) CaO + H2O → Ca(OH)2 Solid calcium oxide was taken in a container and water was added slowly to it. Quick lime reacts vigorously with water to produce slaked lime with the release of large amount of heat. Give an example of a decomposition reaction. (2012) When fats and oils are oxidised, they become rancid and their smell and taste changes. (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? Question 9. Putting the symbols and formulae of all the substances in the above words gives equation, Question 8. 4.Double displacement of Barium chloride and sodium sulphate.for all these reactions give equations and also give the colour of product and reactant side. A smell of burning sulphur is also obtained due to the formation of sulphur dioxide. (2013) (iii) Double displacement reaction (ii) Pb (s) + CuCl2 (aq) → PbCl2 (aq) + Cu (s) (c) The phenomenon is rancidity. 2.Decomposing Ferrous sulphate  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. (iii) Heating of limestone To get the best experince using TopperLearning, we recommend that you use Google Chrome. Q-If 100g of water is decomposed, how many grams of oxygen and hydrogen are obtained? What type of reaction is represented by digestion of food in our body??? Iron displaces Cu from copper sulphate solution as iron is more reactive than copper. It means a balanced chemical equation has equal masses of various elements in reactants and products. Write two observations when lead nitrate is heated in a test tube. The new substances produced in a reaction are known as products. Calcium oxide reacts vigorously with water to form Calcium hydroxide (slaked lime). (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). I’ve been practising traditional silver-based black & white photography for a couple of years but today it occurred to me that I don’t really know what is going on with the various chemicals. Silver bromide also decomposes to silver and bromine by light. Identify the type of chemical reactions in the following processes:  (2014) Answer: When light falls on pale yellow coloured silver bromide, it changes to greyish white due to the formation of silver metal. State the kind of chemical reactions in the following examples:  (2014) (i) it does not react with cold as well as hot water but reacts with any other physical state of water, Please login back to continue to your studies. Observations: Question 7. Write balanced chemical equations for the following reactions: Posted on Apr 18, 2011 by Jonathan. (vi) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is formed. Oxidising agent = Fe2O3 (ii) Pb (NO3)2 + 2KI → PbI2 + 2KNO3 (a) A balanced chemical equation has an equal number of atoms of different elements in the reactants and products. Substance oxidised = Al Reaction will not take place if the reactants are in a solid state. Name a metal for each case:

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