Ans. The arrangement of metals in order of decreasing reactivity is called activity series of metals. In a decomposition reaction, single reactant breaks down to produce two or more products, where as  in a combination reaction,  two or more reactions combine to give a single product. (a) Hydrogen gas and iron chloride are produced. This is because according to the law of conservation of mass , mass can neither be created nor destroyed. Q3. (c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate. Give example of a double displacement Reaction other than the one in Activity 1.10. What reactions take place during the digestion of food in our body ?Paragraph. The representation of a chemical reaction by using the symbols and formulae of the reactants and the products is called a chemical equation. Why does zinc react with dilute sulphuric to give hydrogen gas but copper does not ? Thus , they have very low reactivity and hence do not corrode in moist air. Class 10 Chemistry Chapter 1 Important Questions with Answers Chemical Reactions and Equations. Q3. (c) Hydrogen(g) + Chlorine (g) -> Hydrogen chloride (g). An equation in which the number of atoms of all the elements are equal on the two sides of the equation is called a balanced chemical equation. Q9. Ans. Gold and silver lie very low on the activity series of metals. It reacts with ‘AT to form aluminium chloride … Hence, (i) is the correct option. \(2Al(s)+6Hcl(dil. (c)   Aluminium + Copper Chloride -> Aluminium chloride + Copper. Hence , the number of atoms of each element on the two sides of the equation are equal is called a balanced equation. Q2. Chemical equation for Single displacement. (iii).Sodium + Water –> Sodium hydroxide + Hydrogen. Thus, these reactions are supposed to be opposite of each other. (d) Magnesium +Hydrochloric acid (aq) -> Magnesium chloride (qa) + Hydrogen (g). Ans. Therefore, food items like potato chips etc., are packed with nitrogen gas to prevent them from rancidity for a. Q20. Ans. Ans.The substance ‘X’ used to white washing is Quicklime (Calcium oxide). ionic structure with water molecules. About 17-30% of the aluminum chloride formed is absorbed and is rapidly excreted … Ans. This is because zinc is more reactive than hydrogen whereas copper is less reactive than hydrogen in the activity series. A process in which the original substance lose their nature and identify to form a new chemical substances with different properties is called a chemical reaction. Ans. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Q17. )\longrightarrow 2AlCl_{ 3 }(aq. Reduction :  Reduction is defined as a process which involves gain of hydrogen or loss of oxygen. Q 1. (ii) 2FeSO4(s) -> Fe2O3 + SO2(g) + SO3(g). Ans. and hydrogen gas is formed. Paint does not allow oxygen (from air) and water (moisture) to come in contact with the surface of iron. Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas. Explain. The reason for the three chlorine atoms is because aluminum donates an electron to each chlorine atom. 2007-02-08. (i) Oxidation It is a process in which a substance gains oxygen, e.g. Why does the colour of copper sulphate change when an iron nail is dipped in it? (i).Name the substance ‘X’ and write its formula. Q1. The glucose so formed is slowly oxidised to carbon dioxide and water with the release of heat energy. Oil and fat present in the food items get oxidised and become rancid in the presence of air or oxygen. Aluminum chloride hydroxide (AlCl2(OH)) Molecular Weight: 115.9 g/mol. In addition to forming aluminum chloride, dihydroxyaluminum sodium carbonate and aluminum carbonate form carbon dioxide, and aluminum phosphate forms phosphoric acid. Identify the substances that are oxidised and the substances that are reduced in the following reactions. Ans. Ans. Q5.Translate the following statements into chemical equations and then balance them. What is the difference between oxidation and reduction ? Q4. In aluminum bromide, aluminum has an oxidation number of +3 and bromine has an oxidation number of -1. Sol. Here we have given NCERT Exemplar Class 10 Science Chapter 1 Chemical Reactions And Equations. Ans. Ans. (i) Solution of barium chloride and Sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. Why do we apply paint on iron articles? Endothermic reactions: Those reactions In which heat is absorbed during the reaction are called endothermic reactions. (b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.. Ans. Ans. Obviously therefore O2 has been reduced. Q8. Students can solve NCERT Class 10 Science Metals and Non-Metals Multiple Choice Questions with Answers to know their preparation level. But such reaction is prevented in the presence of nitrogen. Give examples. If you continue to use this site we will assume that you are happy with it. (i) The phenomenon due to which metals are slowly eaten away by the reaction of air, water and chemicals present in the atmosphere is called corrosion. Q19. Ans. why should the chemical equation be balanced? Write the balanced chemical equation to the following and identity the type of reaction in each case. Give an example of a double displacement reaction. Why should the equation be balanced ? Write down the reaction involved. (a) Hydrogen gas combines with nitrogen to form ammonia. When on mixing the clear solution of two ionic compounds, an insoluble solid is formed that separates out the solid formed is called a precipitate and the reaction is called precipitation reaction. When an iron nail dipped in the copper sulphate solution than iron displaces copper from the Copper Sulphate solution because Iron is more reactive than copper , according to the following reason-, Iron + Copper Sulphate –> Iron(ii) Sulphate + Copper. 3BaCl2 + Al(SO4)3 –> 3BaSO4 + 2AlCl3. Aluminum hydroxide or oxide is slowly solubilized in the stomach and reacts with hydrochloric acid to form aluminum chloride and water. However, due to the presence of contaminants (iron (III) chloride), it acquires a yellowish colour. Why? H2 has gained oxygen to form H2O. What do you mean by precipitation reactions? Q 7. As for physical appearance, Aluminium chloride is usually white. Sodium (Na) has gained oxygen to form Na2O. At temperatures around 180 - 190°C (depending on the pressure), aluminium chloride coverts to a molecular form… Component Compounds: CID 5359463 (Aluminum dichloride) CID 962 (Water) Dates: Modify . In the sieve of silver, the recovery of nitrate solution involved displacement by copper metal. why does dimerisation of aluminium tri-chloride occur. Ans. Aluminium chloride (AlCl 3) is a compound of aluminium and chlorine.The solid has a low melting and boiling point, and is covalently bonded. Oil and fat containing food items are flushed with nitrogen. Q12. Ans. Ans. Q18. Exothermic reactions: Those reaction in which heat is evolved during the reaction are called exothermic reaction. (ii).Barium chloride + Aluminium Sulphate –> Barium Sulphate + Aluminium Chloride. This hinders the burning of magnesium. Q6. 2020-11-15. Why are decomposition reactions called the opposite of combination reactions? An equation in which the number of atoms of different elements on the two sides of the equation are equal is called a balanced equation. Write equation for these reactions. What does one mean exothermic and endothermic reactions? Oxidation of fatty foods forming compounds with bad smell and bad taste is called rancidity. Write the balanced equation for the following chemical reactions. What do you mean by ‘ activity series of metals ‘ and also name the most reactive metal and least reactive metal of the activity series of metals. Coke + Steam -> Carbon monoxide. (a) Calcium hydroxide + Carbon dioxide  -> Calcium Carbonate + Water, (b) Zinc + Silver nitrate -> Zinc nitrate + Silver. By applying paint on iron articles, they can be prevented from corrosion (rusting). Hence, this layer is first removed by rubbing with Sand paper before burning. Q2. In a displacement reaction, a more reactive element displaces a less reactive element from its solution. Chemical Reaction and Equation class 10 Notes, NCERT Solutions for class 10 Science - Product of Class of Achievers, NCERT Solutions for Class 10 Hindi Sparsh Manushyata, NCERT Solutions for Class 10 Hindi Sparsh Parvat Pradesh me Pavas, Aatmkathya Jaishankar Prasad Kshitij NCERT Solutions for Class 10, Savaiya Aur Kavitt Dev Kshitij NCERT Solutions for Class 10, Tulsidas Ram Lakshman Parshuram Samvad Kshitij NCERT Solutions for Class 10, संसाधन एवं विकास / sansadhan evam vikas class-10 notes in hindi. Ans. HCl to form aluminium chloride . In compounds, the oxidation numbers must add together to become 0. Q6. Hence, CuO has been reduced to Cu. The compound is formed when aluminium and chlorine are reacted together. Copper oxide (CuO) has Lost oxygen to form Cu. Q16. Potassium is the most reactive metal and platinum is the least reactive metal.

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