(2017D) Al2O3 + NaOH → NaAlO2 + H2O (2013) Question 1. (ii) Displacement reaction (i) The colour of the ferrous sulphate crystals is green before heating and changes to brown after heating. For example: An inert gas such as nitrogen is added to prevent the packed chips from getting oxidised. Zinc + Sulphuric acid → Zinc sulphate + Hydrogen These reactions require energy either in the form of heat, light or electricity for breaking down the reactants. (i) Decomposition reaction (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. Out of these solutions which solution, can be kept in the aluminium container? how is it formed and why once SO3 and then SO3. (2012) (ii) Combustion of coal in air Compound A, the main supporter of life on Earth, needs a drop of sulphuric acid to give a rocket on the basi of reactivity of elements or some other basis. (iv) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and blue colour of copper sulphate solution fades away. (i) Barium chloride solution is mixed with copper sulphate and a white precipitate is formed. Write the chemical equation to justify your answer. The above reaction is used in black and white photography. Ca(OH)2 (aq) + CO2 (g) ---> CaCO2(s) + H2O, differenciate between direcet combination reaction and a decomposition reaction 2 g of ferrous sulphate crystals are heated in a boiling tube. (a) When calcium oxide and water combine to form a single product calcium hydroxide, a large amount of heat is also released. It is a combination reaction because in this reaction two substances combine to form a single substance. Identity X and also write the chemical reaction involved. what is the chemical equation of quick lime? (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. name these gases? (b) Write balanced chemical equations in each case Queries asked on Sunday and after 7 pm from Monday to Saturday will be answered after 12 pm the next working day. Question 5. Answer: Thus it is a type of thermal decomposition reaction. when potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas. Question 15. Answer: Write the balanced chemical equation for this reaction and state (i) the substance oxidized and (ii) the substance reduced in the reaction. This is due to the decomposition of silver chloride into silver and chlorine by light. (2015) (iv) Combination reaction Please login back to continue to your studies. Q-If 100g of water is decomposed, how many grams of oxygen and hydrogen are obtained? compound C is prepared by using diamond and the supporter of combustion. (i) Digestion of food in stomach It’s just a process of remembering which bottle is which. 1.quick lime with water pse define how do we make equation ie. Solid calcium oxide was taken in a container and water was added slowly to it. Name the type of reaction taking place. Observations: Question 7. AgCl is broken down into Ag and Cl.This is a reaction used in black and white photography. Fe2O3 (s) + 2Al (s) → 2Fe (l) + Al2O3 (l) + Heat. (2012) Substance oxidised = H2S Reducing agent = CO, (c) Compound B, with the same components of A are Select (i) combination reaction (ii) decomposition reaction and (iii) displacement reaction from the following chemical equations: (2014) (b) Fe2O3 + 3CO → 2Fe + 3CO2 asked May 12 in Chemical Reaction and Catalyst by RadhaRani ( 54.3k points) chemical reaction and catalyst A smell of burning sulphur is also obtained due to the formation of sulphur dioxide. 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). forms a precipate with slaked lime unless excess amount is passed into it. Answer: Question 11. (iii) Heating of limestone This displacement reaction occurs because iron is more reactive than copper. Answer: (2014) These two reactions are used in black and white photography. So this is an oxidation reaction. represent this in the form of a balanced equation. Write chemical equation of the reaction and state its one use. CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. Why chemical equations are balanced? The new substances produced in a reaction are known as products. (i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas. 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. (2013) (iv) Egg shells are dropped in hydrochloric acid. silver nitrate solution is kept in colored bottles.why? During digestion, the complex food is broken into simpler form. (i) ZnCO3 (s) → ZnO (s) + CO2 (g) Prevention from rancidity. This compound Reducing agent = Al, (b) We're sorry, but this browser is not supported by TopperLearning. In this reaction, barium sulphate is formed as a white, insoluble solid which separates out suddenly from solution. Give the chemical equations (balanced) for the following: (1) Reaction used in black and white photography. The substances which combine or react are known as reactants. (ii) Excess of carbon dioxide gas is passed through lime water. fuel and the supporter of combustion. Represent this in the form of balanced chemical equation. (ii) Combustion of coal is air. Name a metal for each case: (a) ‘X’ is Calcium oxide (CaO). H2S + Cl2 → 2 HCl + S Oxidising agent = SO2 Answer: during the reaction of some metal with dilute hydrochloride following observations were make: This element is found in our bones also. (ii) Pb (s) + CuCl2 (aq) → PbCl2 (aq) + Cu (s) It is first white in colour. Answer: 0 ; ... 2AgCl ==> 2Ag + Cl 2. the above reaction is an example of decomposition which is used in photography. (i) Substance oxidized = H2 (Hydrogen gas) (vii) Decomposition reaction. (d) What is the colour of the precipitate left behind in the last case? (a) In electrolysis of water (H2O), the hydrogen goes to one test tube and oxygen goes to another. Question 2. Rules for writing a chemical equation: For example: Question 13. Continue, I understand this browser is not compatible. (2014) 2.Decomposing Ferrous sulphate (2015) Please provide your registered email address below, An Email has been sent with your login details, Need assistance? Characterised by the formation of precipitate. Answer: Answer; In this reaction, one substance is splitting up into three substances so this is a decomposition reaction. Answer: (i) Solid calcium oxide was taken in a container and water was added to it. Oxidising agent = Fe2O3 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 . Identify the type of chemical reactions in the following processes: (2014) To get the best experince using TopperLearning, we recommend that you use Google Chrome. 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. (ii) What type of reaction is this? what is thermolytic decomposition reaction? Please log in again! This is the addition of oxygen. Give an example of a decomposition reaction. Silver bromide also decomposes to silver and bromine by light.
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