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Chemical Reactions and Equations chapter explains the concepts related to chemical reactions and equations. Here, you will know different types of reactions taking place in the surrounding. Some important topics explained in this chapter are:. Acids, Bases and Salts chapter mainly explains the difference between acids, bases and salts.
It also deals with various types of reactions related to these three forms of chemical compounds. Some important topics involved in this chapter are:. Important topics covered in this chapter are:. Carbon and its Compounds chapter describes various features of carbon element and different compounds formed by it. Give below are the main topics covered in class 10 Science Chapter Here students get to learn the carious concepts related to the classification of elements.
Some major concepts discussed in this chapter are:. Life Processes chapter deals with the various biological processes and reaction taking place in organisms. Some major topics covered in this chapter are:. Control and Coordination chapter gives details of different ways in which organisms respond to the stimuli.
If 1 mole of N 2 molecule reacts with 1 mole of O 2 molecule, the heat of KJ has to be supplied to initiate the reaction to give 1 mole of NO molecule. This means that the bonds between N � N and O � O are so strong that they do not break easily. N 2 has triple covalent bond between the two N atoms. O 2 has a double covalent bond. Thus energy has to be put into the reaction to break the strong bonds.
Thus the above reaction is a good example of an endothermic reaction. Solution: During respiration, glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy. Write equations for decomposition reactions.
Solution: Essentially, decomposition reactions are the opposite of combination reactions. A compound decomposes i. Most decomposition reactions are endothermic. Another example of decomposition reaction is the heating of calcium carbonate sea shells, chalk :.
Question 12 Write one equation each for decomposition reactions in which energy is supplied in the form of heat, light or electricity? Solution: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide:. Write relevant equations for the above? Solution: The difference between the displacement and double displacement reactions is that in a displacement reaction one element displaces another by virtue of it being more reactive whereas in a double displacement two anions and two cations switch places between two compounds respectively.
Thus Zn displaces Cu in the salt form. Zn is more reactive than Cu. Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal.
Explain by giving examples: Solution: A precipitation reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of solution as a solid. This insoluble compound is called a precipitate. An example of a precipitation reaction Aqueous silver nitrate AgNO3 , when added to a solution containing potassium chloride KCl , precipitates a white solid, and silver chloride is observed.
Solution: The shiny brown colored element X is copper metal Cu. When copper metal is heated in air, it forms a black colored compound copper oxide. So, the black colored compound is the copper oxide or copper II oxide, CuO. Question 17 Why do we apply paint on iron articles? Solution: Rust is a soft and porous substance, which gradually falls from the surface of an iron object, and then the iron below starts rusting.
Thus, rusting of iron or corrosion of iron is a continuous process which, if not prevented in time, eats up the whole iron object.
So, when we apply paint on iron articles it reduces the rusting of iron. Question 18 Oil and fat containing food items are flushed with nitrogen. Solution: Packaging fat and oil containing foods in nitrogen gas can prevent rancidity. When the fat and oil present in food materials gets oxidised in air , their oxidation products have an unpleasant smell and taste.
When it is surrounded by unreactive gas, nitrogen, there is no oxygen of air to cause its oxidation and make it rancid.
Question 19 Explain the following terms with one example each. Corrosion b. Rancidity Solution: a. Corrosion is the process in which metals are eaten up gradually by the action of air, moisture or a chemical on their surface. Corrosion is caused mainly by the oxidation of metals by the oxygen of Ncert Solutions For Class 10th Science Chapter 3 Number air. Example: Rusting of iron is the most common form of corrosion. This is called rusting of iron. The condition produced by aerial oxidation of fat and oil in food which is marked by an unpleasant smell and taste is called rancidity.
Example: Rancidity can be retarded by keeping food in a refrigerator. The refrigerator has a low temperature inside it. When the food is kept in a refrigerator, the oxidation of fat and oil in it is slowed down due to low temperature.
So, the development of rancidity due to oxidation is retarded. Question 20 Why should a magnesium ribbon be cleaned before burning in air? Solution: To remove the oxide layer and facilitates rapid burning. Question 21 Write the balanced equation for the following chemical reactions.
Question 22 Write a balanced chemical equation and state symbols for the following reactions. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride b. Sodium hydroxide solution in water reacts with hydrochloric acid solution in water to produce sodium chloride solution and water. Question 24 Why does the colour of copper sulphate solution change when an iron nail is dipped into it? Solution: In this reaction, iron displaces copper from copper sulphate solution.
The deep blue colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate. A red-brown coating of copper metal is formed on the surface of the iron metal. This displacement reaction occurs because iron is more reactive than copper.
Question 25 Identify the substances that are oxidised and the substances that are reduced in the following reactions. The addition of oxygen is Called oxidation. So the substance that is oxidized is sodium Na. In this reaction, copper oxide CuO gives the oxygen required for the oxidation of hydrogen; therefore, copper oxide is the oxidizing agent.
Hydrogen is responsible for removing oxygen from copper oxide; therefore, hydrogen is the reducing agent here. Question 1. When crystals of lead nitrate are heated strongly in a dry test tube a crystals immediately melt b a brown residue is left c white fumes appear in the test tube d a yellow residue is left Answer: b Pungent smelling, brown fumes are evolved due to NO 2 gas and brown coloured residue of lead oxide PbO is left.
Question 2. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
In acidic medium, KMnO 4 oxidises ferrous sulphate to ferric sulphate. Question 3. Dilute hydrochloric acid is added to granulated zinc taken in a test tube.
The following observations are recorded. Point out the correct observation. HCl to form zinc chloride and bubbles of colourless and odourless hydrogen gas is evolved. Question 4. When a magnesium ribbon is burnt in air, the ash formed is a black b white c yellow d pink Answer: b When a Mg ribbon is burnt in air, the ash formed is of magnesium oxide which is white in colour.
Question 5. Neutralization Reaction. This is a chapter that begins with an explanation of different physical properties regarding different metals and non-metals.
Then the students will reach the chemical properties of these metals and non-metals as well. After that, we get to learn more about different reactions that go through these products after they are being reacted with compounds.
Apart from that, there are several details about corrosion and other topics such as metal occurrence in nature and the environment. Most long-answer questions are included in the chapter along with some experiments as well. There are 5 different exercises along with an End exercise in this chapter. One of the most important topics that students have to go through in this chapter would be the basics of the detergent and soap cleansing actions.
There is also a mention of the nomenclature of carbon and the different compounds that it has. Also included are details about the derivatives of such compounds in the best way. There are 5 exercises and an End exercise in this chapter. Students will be able to learn the analysis, applications, of Carbon and its Compounds from these solutions of the chapter. There are also some memory-based and practical questions provided here.
How we managed to reach the periodic table is also included in the chapter. There are descriptions of the different details about the modern periodic table. The chapter consists of different questions and exercises to which you will get solutions. Students can get well-explained and detailed answers to the questions in this particular chapter that they can further use in order to ensure that they are able to answer all the questions in the easiest way.
The 6th chapter of Class 10 Science is of Biology and it deals with different processes of life such as Respiration, Transpiration, Nutrition, Excretion, and much more in plants and human beings. The chapter consists of 34 different questions and from these questions, some are objective while others are long-answer type questions.
Students can use these questions and get their solutions from our official site to make sure that they are able to score better marks than the others in their examinations. We are pretty sure that this is going to help a lot.
In this chapter, students will get to have a deeper understanding of topics such as the nervous system in the body of human beings. Also, they will get to know about the anatomy of the human brain along with the coordination of hormones in animals. The chapter includes about 12 different questions and there are some objective-type options for the students to choose from as well.
Go and refer to the NCERT solutions for class 10 science right now to get the best results in your exams. In the 8th chapter of the book, we provide some explanation about the process of reproduction that takes place in single-celled organisms and multi-celled organisms as well. The chapter explains the different types of reproduction such as sexual and asexual. Also, there are details about the reproductive systems in plants as well as animals. There are about 11 questions in this chapter and there are some exercises as well.
So, students will get to learn a lot from these chapters in the best way. This chapter in the science book deals with the passing of genes between different generations. Also, the chapter provides information on the process of sex determination. The chapter has details on the entire concept of Evolution with the help of the Charles Darwin theory.
Students can get familiar with the concepts and then attempt to solve the questions that are provided in the chapter. There are about 12 questions in it along with end exercises as well. After reading this chapter, the students will get to know about the different phenomena that the light has to go through. Refraction and reflection are the important topics in this chapter and there are several explanations to these the laws of refraction and reflection.
There are also some mathematical elements in the chapter that are explained well in our solutions. The chapter includes 17 different questions along with an end exercise for the students. The first 5 questions included in the chapter tend to be objective. This is a chapter that will primarily focus on the human eye structure as well as the various functions that are included in every single part of the eye.
Also, there are some explanations regarding the different eye problems that people might have in their life. There are about 13 questions present in the chapter.
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