(v) Quicklime reacts vigorously with water releasing large amount of heat. during the reaction of some metal with dilute hydrochloride following observations were make: 2AgCl -----> 2Ag + Cl Silver Silver Chlorine Chloride (White) colourless and kept away from sunlight, produces A and the supporter of combustion. (i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas. Zinc + Sulphuric acid → Zinc sulphate + Hydrogen This is due to the decomposition of silver chloride into silver and chlorine by light. Answer: (a) Also a brown substance will be deposited on the iron nail. The above reaction is used in black and white photography. displacement reaction and a neutralization reaction. Ca(OH)2 (aq) + CO2 (g) ---> CaCO2(s) + H2O, differenciate between direcet combination reaction and a decomposition reaction So this is an oxidation reaction. Question 5. Write two observations when lead nitrate is heated in a test tube. (i) Phosphorus burns in chlorine to form phosphorus pentachloride. Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction. (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. Copyright Notice © 2020 Greycells18 Media Limited and its licensors. (i) Digestion of food in stomach Answer: ii. what is thermolytic decomposition reaction? Question 2. Suggest one method to prevent it. (v) CaO (s) + H2O (l) → Ca(OH)2 Name the type of reaction taking place. (iii) Dilute sulphuric acid reacts with sodium carbonate. (i) State two observations made in the experiment. Answer: Write the chemical equation to justify your answer. Reducing agent = Al, (b) (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. Answer: (vi) 3H2 (g) + N2 (g) → 2NH3 (g) (2012) Please log in again! (2012) On treatment with water it forms a solution which turns red litmus blue. (ii) Excess of carbon dioxide gas is passed through lime water. (vii) Decomposition reaction. What is Thermolytic decomposition reaction? State the kind of chemical reactions in the following examples: (2014) It is first white in colour. Write balanced chemical equations for the following reactions: Why are decomposition reaction are called opposite of combination reaction? Thumbs up pls. Now place this china dish in sunlight for some time. Reducing agent = CO, (c) compound C is prepared by using diamond and the supporter of combustion. (i) Decomposition reaction Substance reduced = SO2 (ii) Burning of natural gas. All rights reserved. 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. Posted on Apr 18, 2011 by Jonathan. (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? What is the relationship between black and white photography and decomposition of silver chloride, Differences between combination and decomposition reaction. (2013) The colour of the crystals changes due to the formation of ferric oxide. The amount of heat evolved is so large that the metal is produced in the molten state. Therefore it is a combination reaction which is exothermic. (c) The phenomenon is rancidity. (c) Name the type of reaction in each case (b) Choose a metal from the following metals which reacts only with hot water: Sodium, magnesium, iron. The new substances produced in a reaction are known as products. Quick lime reacts vigorously with water to produce slaked lime with the release of large amount of heat. 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). When silver bromide is exposed to light, it decomposes to form silver metal and bromine (iii) NaBr (aq) + AgNO3 (aq) → AgBr (s) + NaNO3 (aq) 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. the reaction of sodium metal is found to be highly explosive. (c) Carbon dioxide is passed through lime water. ... Name two salts that are used in black and white photography. Write the balanced chemical equation for the following reactions: (2014) Question 3. Why are decomposition reactions called opposite of combination reactions. (a) Identify A, B and C 2.Decomposing Ferrous sulphate on heating green coloured ferous sulphate crystal reddish brown solid is left and smell of a gas having odour of burning sulphur is absorbed ? (i) it does not react with cold as well as hot water but reacts with any other physical state of water, Substance oxidised = H2S (2012) Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reaction: Answer: (a) What is meant by balanced chemical equation? These reactions require energy either in the form of heat, light or electricity for breaking down the reactants. Please visit My Question Space for update. give five example of ridox reaction? 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). (2012) Iron displaces Cu from copper sulphate solution as iron is more reactive than copper. Question 1. (b) Identify the oxidising agent, reducing agent in the following reaction. (iii) Double displacement reaction 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. what is the chemical equation of quick lime? Give a balanced chemical equation for the reaction that takes place, when it is exposed to light. The two electrodes collect H and O separately. Answer: In this reaction, Cu is changing into CuO. 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. Question 14. Also state the type of reaction. Take about 2 g silver chloride in a china dish. BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2 NaCl (aq). Oxidising agent = MnO2 This substance is nothing but copper metal. Oxidising agent = Fe2O3 All the decomposition reactions are not redox reactions. 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. To get the best experince using TopperLearning, we recommend that you use Google Chrome. (iii) Heating of limestone Name a metal for each case: H2S + Cl2 → 2 HCl + S 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. (2014) (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). Answer: Both silver chloride and silver bromide are used in black and white photography. Therefore it is a type of decomposition reaction.
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