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NCERT Solutions for Class 10 Science Updated for 10th Science Chapter 1 Answers in English & Hindi Medium. NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations Exercises and intext questions in English and Hindi Medium updated for new academic session to use online or download in PDF form free. All the solutions are updated for UP Board, CBSE Board, MP Board, etc., who are use NCERT Books . Aug 04, �� NCERT Books Class 10 Science: The National Council of Educational Research and Training (NCERT) publishes Science textbooks for Class The NCERT Class 10th Science textbooks are well known for it�s updated and thoroughly revised syllabus. The NCERT Science Books are based on the latest exam pattern and CBSE syllabus. Feb 14, �� NCERT Books Class 10 Science: Science is one of the most important and high scoring subjects for CBSE Class 10 board exam. Thus, it becomes very important to be thorough with your studies and never miss a single topic for the exam. To help you in the process, we at Embibe have provided CBSE Class 10 Science book PDF.
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The representation of chemical reaction in the form of formulae of reactants and products separated by an arrow marks is known as a Chemical Equation. The types of reaction are as follow; 1 Combination reaction 2 Decomposition reaction 3 Displacement reaction 4 Double displacement reaction 5 Oxidation and reduction reaction.

The reaction in which a single reactant breaks down into two or more than two simpler products is known as decomposition reaction. Reactions in which heat is released along with the formation of products are called exothermic. During the reaction large amount of heat energy is evolved and this heat makes the reaction mixture warm. When we take food to get energy to stay alive. During digestion, food is broken down into simpler substances likes carbohydrates and other nutrients.

These carbohydrates further broken down to form glucose. This glucose combines with oxygen in cells of our body in the process of cellular respiration and provide energy. Therefore, respiration is also an exothermic reaction. The process in which metals looses their surface gradually by the action of air, water and moisture is called corrosion. Answer: i The substance whose solution in water is used for white washing is calcium oxide or quick lime.

Its formula is CaO. Question 2 Why is the amount of gas collected in one of the test tubes in text book Activity 1. Name this gas. Question 1 Why does the colour of copper sulphate solution change when an iron nail is dipped in it? OR An iron nail is dipped in the solution of copper sulphate for about 30 minutes. State the change in colour observed. Give reason for the change. The colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate.

Question 2 Give an example of a double displacement reaction other than the one given in Activity 1. Answer: Sodium hydroxide and hydrochloric acid react to form sodium chloride and water. Question 3 Identify the substances that are oxidised and the substances which are reduced in the following reactions.

Question 1 Which of the statements about the reaction below are incorrect? Question 3 What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer : a Hydrogen gas and iron chloride are produced. Answer: a Hydrogen gas and iron chloride are produced.

Question 4 What is a balanced chemical equation? Why should chemical equations be balanced? Answer: A balanced chemical equation has an equal number of atoms of different elements in the reactants and products. The chemical equations should be balanced to satisfy the law of conservation of mass.

Question 5 Translate the following statements into chemical equations and then balance them. Question 9 What does one mean by exothermic and endothermic reactions?

Give examples. Answer: Exothermic reactions : Those reactions in which heat is evolved are known as exothermic reactions. Endothermic reactions : Those reactions in which heat is absorbed are known as endothermic reactions. Question 10 Why is respiration considered an exothermic reaction? Answer: Respiration is an exothermic process because during respiration glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy.

Question 11 Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions. Answer: In a decomposition reaction, a single compound breaks down to produce two or more simpler substances.

For example:. While, in a combination reaction, two or more substances simply combine to form a new substance. Question 12 Write one equation each for the decomposition reactions where energy is supplied in the form of heat, light or electricity. OR Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.

Question 13 What is the difference between displacement and double displacement reactions? Answer: In displacement reactions, a more reactive metal displaces a less reactive metal from its solution. In double displacement reactions, two reactants in solution exchange their ions. Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal.

Write down the reaction involved. Question 15 What do you mean by a precipitation reaction? Explain by giving examples. Answer: A reaction in which an insoluble solid called precipitate is formed that separates from the solution is called a precipitation reaction. Question 16 Explain the following in terms of gain or loss of oxygen with two examples each: a Oxidation and b Reduction.

Answer: a Oxidation : The addition of oxygen to a substance is called oxidation. The black coloured compound is copper oxide CuO. The reaction involved is. Question 18 Why do we apply paint on iron articles?

Answer: Paint does not allow iron articles to come in contact with air, water and saves iron articles from damage due to rusting. Question 19 Oil and fat containing food items are flushed with nitrogen. Answer: To keep food items fresh and save from getting oxidised, food items are flushed with nitrogen. Question 20 Explain the following terms with one example each a Corrosion, b Rancidity.

Answer: a Corrosion : It is the process in which metals are eaten up gradually by the action of air, moisture or a chemical Ncert Solutions For Class 10th Science Chapter 3rd such as an acid on their surface. Example : When iron is exposed to moist air for a long period of time, its surface acquires a coating of a brown, flaky substance called rust.

Rancidity spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating. Rancidity can be prevented by adding anti-oxidants to foods containing fats and oils. It can also be prevented by flushing fat and oil containing foods with nitrogen before sealing. Question 1 Which of the given statements about the reaction below are incorrect? Lead is getting reduced b. Carbon dioxide is getting oxidised c. Carbon is getting oxidised d.

Lead oxide is getting reduced i a and b ii a and c iii a , b and c iv all Solution: i a and b. Question 2 The above reaction is an example of a i. Combination reaction ii. Double displacement reaction iii. Decomposition reaction iv.

Displacement reaction Solution: iv Displacement reaction. Question 3 What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer. Hydrogen gas and iron chloride are produced b.

Chlorine gas and iron hydroxide are produced c. No reaction takes place d Iron salt and water are produced Solution: Hydrogen gas and iron chloride are produced. Solution: An equation for a chemical reaction is an equation in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

In other words, the mass and the charge are balanced on both sides of the reaction. Hydrogen gas combines with nitrogen to form ammonia b. Hydrogen sulfide gas burns in air to give water and sulfur dioxide c. Control and Coordination chapter gives details of different ways in which organisms respond to the stimuli.

Here you also get to know about the human nervous system, automatics and voluntary actions, exocrine and endocrine glands, etc. How do Organisms Reproduce chapter students get to learn different methods of reproduction in plants and animals and get aware of the various methods of birth control in humans. Some of the important topics discussed in this chapter are:. Heredity And Evolution chapter deals with the details related to heredity and evolution of different species.

Go through the major topics mentioned below:. Light Reflection and Refraction explains the concepts of reflection and refraction of light. Some important topics to learn from this chapter are:. The Human Eye and Colorful World chapter students get to know each and every detail of the human eye from its structure to its working. Various defects of vision are also discussed here. It also explains atmospheric refraction and various phenomena related to it. Some major topics discussed in this chapter are:.

Electricity chapter explains electric current, its applications and various effects related to it. Sources of Energy: Different forms of energy and their sources are discussed in this chapter.




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Ncert Class 10th Science First Chapter