When hydrogen is passed over hot copper oxide, we get copper and water. Iron articles are shiny when new, but get coated with a reddish brown powder called rust (Fe. Ans. This layer hinders the burning of magnesium. CBSE Class 10 Science Book Chapter 1 “Chemical Reactions and Equations” Multiple Choice Questions ‌(MCQs‌) with Answers. In moist air, copper corrodes to produce a green layer on the surface? Keeping food in air tight containers helps to slow down oxidation or Rancidity. are added to foods containing fats and oil. when magnesium ribbon remains exposed to moist air, A white layer of magnesium oxide is formed On its surface. By the process of Galvanization: This is a process of coating zinc on iron sheets by using electric current. The hydrogen sulfide reacts with the silver to form silver sulfide. (iii) Name the oxidising agent. Hence, this layer is first removed by rubbing with Sand paper before burning. (ii) Name the substance which is getting reduced. Chemical Reactions and Equations NCERT SOLUTIONS CLASS 10 SCIENCE 1 Chapter 1 Chemical Reactions and Equations Page Number: 6 Question 1 Why should a magnesium ribbon be cleaned before burning in air? Sodium reacts with the oxygen in air to form sodium oxide, and traces of yellowish sodium peroxide. The chemical reaction is. This is achieved by the following methods: When fats and oils are oxidised, they become rancid and their smell and taste is changed. Method 3500-Ag C Inductively Coupled Plasma Method [2]. nH2O (s) or rust. In case of tarnishing of silver articles, the metallic silver reacts with hydrogen sulphide or sulphur present in air and gets tarnished. Chemical reactions are the processes in which new substances with new properties are formed. This method not only lends protection but also enhances the metallic appearance. Work out the following using chemical equation. Corrosion of Iron is also called Rusting of iron. Copper forms a green deposit on its surface when exposed to air which is usually a mixture of copper carbonate and copper hydroxide. The reaction is as follows: 2Cu + … When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal. By alloying with other metals: Alloys (mixture of metals) is more resistant to corrosion. Question 1. State the substance that is being oxidised and the one that is getting reduced. The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). Corrosion of Iron is also called Rusting of iron, . Your email address will not be published. The black coating on silver and the green coating on copper are other examples of corrosion. The symbolic representation of a chemical reaction is called a chemical equation; The method of representing a chemical reaction with the help of symbols and formula of the substances involved in it is known as a chemical equation. Methods of preventing Corrosion or Rusting : Corrosion of metals is prevented by not allowing them to come in contact with moisture and O2. The equation for this would be 4Fe + 6H20 gives 2Fe2O3 + 6H2 Magnesium is very reactive Metal. Although presence of moisture makes corrosion faster but it is not necessary condition. The copper wire glows red. It displaces hydrogen from water/steam, which is evolved or released as a gas. silver plating, nickel plating. presence of moisture makes corrosion faster but it is not necessary condition. COPPER CORROSION. 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The green coating on copper metal called a Patina. 2Cu + H20 + Co2 + O2 [Moist Air] = Cu (OH2) [ Copper Hydrooxide) + CuCo3 [ Copper Carbonate ] What will happen when copper is heated? By coating with paints: Paint coated metal surfaces keep out air and moisture. (ii) Moist air and acidic gases are not good for some metals. Write chemical equations for the reactions taking place when: (i) Iron reacts with steam (ii) Magnesium reacts with dilute HCl (iii) Copper is heated in air Answer: Question 9. fialance the following chemical equations and identify the type of chemical reaction. In case of rusting of copper, the metallic copper reacts with oxygen, carbon-dioxide and atmospheric moisture and develops a green coloured coating of copper hydroxide and copper carbonate. nH2O. (a) Mg (s) + Cl 2 (g) → MgCl 2 (s) (d) TiCl 4 (l) + Mg (s) → Ti (s) + MgCl 2 (s) Electroplating: It is a method of coating one metal over the surface of Iron (or other metal) by passing electric current. Give reasons for the following: (i) Keeping food in air tight containers help in preventing rancidity. The green material is a mixture of copper hydroxide and copper carbonate. Corrosion is defined as the oxidation of metal by air. Fig. This is called Rancidity. Silver is a very noble metal and is often found in a native state combined with gold, tin, copper, and platinum. Write the balanced equation for the following chemical reactions. In this Zinc forms a protective layer of zinc carbonate on the surface of iron.This prevents corrosion. Q2. Copper developing green coloured rust on exposure to moist air Cop­per, like all oth­er met­als, is ca­pa­ble of ox­i­da­tion, form­ing sta­ble bonds in the forms of ox­ides and salts. Copper forms a green deposit on its surface when exposed to air which is usually a mixture of copper carbonate and copper hydroxide. Iron reacts with water in the form of steam to form iron oxide, along with the release of hydrogen. Cop­per ox­i­da­tion is a nat­u­ral process. Chemical Reactions and Equations Class 10 Important Questions Very Short Answer Type. In corrosion, the metal is slowly oxidized by the air. Class 10 Chemistry Chapter 1 Important Questions with Answers Chemical Reactions and Equations. why register with www.thechemistryguru.com. A portion of the sample is digested in a combination of acids. Fig. Cop­per is an el­e­ment that be­longs to the group of met­als and holds 29th place on Mendeleev’s pe­ri­od­ic ta­ble. Copper burns in air to combines with oxygen and form copper (II) oxide, a black oxide. Copper carbonate is the chemical compound that forms the blue-green patina seen on copper. Answer: The balanced chemical equation for the reaction is: CuO + H 2 → Cu + H 2 O. Since the chemical equation consists of symbols, we can think of this as a symbolic representation. We can go further and translate the picture equation for the reaction between magnesium and oxygen to a chemical equation: 2 Mg + O 2 → 2 MgO. Example: stainless steel. The hydrogen sulfide reacts with the silver to form silver sulfide. The overall reaction proceeds in the same process as described earlier for iron: The green coating on copper metal called a Patina. 2Cu + H 2 O + CO 2 + O 2 → Cu(OH) 2 + CuCO 3 Required fields are marked *, What Happens When Copper Vessel Is Exposed To Moist Air For Long Time State. The green coating is mainly Copper (II) Carbonate CuCO3 caused by slow chemical reactions involving the copper metal and water and carbon dioxide. Chemical reactions for zinc. Copper developing green coloured rust on exposure to moist air. Fe(OH)3 (s) dehydrates into Fe2O3. Iron articles are shiny when new, but get coated with a reddish brown powder called rust (Fe2O3.n H2O) when left for some time. 2 Cu + H2O + CO2 + O2 → Cu (OH)2 + CuCO3. with its abundance of soluble sulfates and oxygen-consuming, decaying organic matter, sulfate-reducing bacteria utilizes available sulfates under anaerobicconditions to form hydrogen sulfides as a metabolic product. When copper is exposed to moist air for a long time, it acquires a dull green coating. By coating with oil and grease: Application of oil and grease on the surface of iron tools prevents them from moisture and air. In the reaction above, copper oxide is losing oxygen. 2 Cu + H2O + CO2 + O2  → Cu (OH)2 + CuCO3. This process is commonly known as rusting of iron. Chemical Reactions and Equations Extra Questions Long Answer Type. (iv) Name the reducing agent. Chemical reactions for silver. In a marine environment, with its abundance of soluble sulfates and oxygen-consuming, decaying organic matter, sulfate-reducing bacteria utilizes available sulfates under anaerobicconditions to form hydrogen sulfides as a metabolic product. (iii) Manufactured chips usually flush bags of chips with nitrogen gas. Consider the chemical equation given below and answer the questions that follow: (i) Name the substance which is getting oxidised. Your email address will not be published. This hinders the burning of magnesium. The following is the reaction In addition, silver is not affected by dry or moist air that is free from ozone, halogens, ammonia, and sulfur compounds . 10th Chemical reaction and equation questions with solution 01 Q.1. The chemical formula for rust is Fe2O3. [math]4Na+O_2\to 2Na_2 O[/math] [math]2Na_2 O+O_2\to 2Na_2 O_2[/math] The sodium oxide formed will react with water to give sodium hydroxide. The chemical equation. When a copper is exposed to moist air for long, it acquires a dull green coating. 2Cu + H 2 O + CO 2 + O 2 -------- Cu(OH) 2 + CuCO3 Copper + Water + Carbon dioxide + Oxygen -------- Copper hydroxide + Copper Carbonate 4 Question 1. The green coating is mainly Copper (II) Carbonate CuCO3 caused by slow chemical reactions involving the copper metal and water and carbon dioxide. Here is a compilation of Free MCQs of Class 10 Science Book Chapter 1 – Chemical Reactions and Equations.. Students can practice free MCQs as have been added by CBSE in the new Exam pattern. The chemistry of the reaction resulting in the formation of rust can be summarized as follows: The chemical equations for rust formation, 2Fe(s) + 2H2O(l) + O2(g)  → 2Fe2+(aq) + 4OH–(aq), 4Fe(OH)2 (s) + O2(g) + 2H2O(l)  → 4 Fe(OH)3 (s). The chemical equation is: 2Cu + H2O + CO2 + O2 → Cu (OH) 2 + CuCO3. When a copper object is exposed to moist air for a long time, then copper reacts with water, carbon dioxide and oxygen present in moist air to form a green coating on the copper object. Answer: Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. It is completely stable in aqueous solutions. When copper reacts with moist air it produce a beautiful green layer which is 1:1 mixture of copper hydroxide and copper carbonate. Zinc reacts with oxygen in moist air. The green coating (or green material) is a mixture of copper hydroxide [Cu (OH) 2 ] and copper carbonate (CuCO 3 ) which is formed by the action of moist air on copper object. The metal burns in air to form zinc(II) oxide, a material that goes from white to yellow on prolonged heating. Write a balanced chemical equation for this reaction. It is formed by the chemcial reaction of copper in moist air. Usually substances which prevent oxidation (antioxidants like Nitrogen, B.H.T.) 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