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NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions & Equations
NCERT based extra questions for Class 10 Science Chapter 1 Chemical Reactions and Equations are available here for free PDF download. These questions and answer. NCERT Solutions Class 10 Science Chapter 1 Chemical Reactions And Equations � Here are all the NCERT solutions for Class 10 Science Chapter 1. This solution contains questions, answers, images, explanations of the complete Chapter 1 titled Chemical Reactions And Equations of Science taught in class If you are a student of class 10 who is using NCERT Textbook to study Science, then you must come across Chapter 1 Chemical Reactions And Equations. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 10 Science Cha. Science NCERT Grade 10, Chapter 1, Chemical Reactions and Equations starts by citing a few daily life examples involving a chemical change. The observations of the activities mentioned determine whether a chemical reaction has taken place. The first part of the chapter, Chemical Reactions and Equations focuses on the concept of chemical equations.

All these NCERT solutions are prepared by expert teachers with detailed explanations of every important topic. It is important for the students to go through these NCERT solutions to get knowledge of the type of question asked on Chemical reactions and equations chapter. Answer 1: Magnesium is a very reactive metal like Na, Ca, etc. When it exposed to air it reacts with oxygen to form a layer magnesium oxide MgO on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen.

The magnesium ribbon is cleaned by sandpaper to remove this layer so that the underlying metal can be used for the reaction. Question 3: Write a balanced chemical equation with state symbols for the following reactions. Question 2: Why is the amount of gas collected in one of the test tubes in Activity 1.

Name this gas. Answer: Using the Electrolysis of water, hydrogen and oxygen are get separated by the electricity. Water H 2 O contains two parts hydrogen and one parts oxygen. Since hydrogen goes to one test tube and oxygen goes to another, the amount of gas collected in one of the test tubes is double of the amount collected in the other.

Question 1: Why does the colour of copper sulphate solution change when an iron nail is dipped in it? Answer: When an iron nail is dipped in a copper sulphate solution, iron which is more reactive than copper displaces copper from copper sulphate solution forming iron sulphate, which is green in colour.

Therefore, the blue colour of copper sulphate solution fades and green colour appears. Question 2: Give an example of a double displacement reaction other than the one given in Activity 1. Answer 2: Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride.

In this reaction, sodium carbonate and calcium chloride exchange ions to form two new compounds. Hence, it is a double displacement reaction. Question 3: Identify the substances that are oxidised and the substances that are reduced in the following reactions.

Answer 3: i Sodium Na is oxidized as it gains oxygen and oxygen gets reduced. Question 1: Which of the statements about the reaction below are incorrect?

Explanation: a because Oxygen is being removed and b because the removed oxygen from Lead is added to the elemental Carbon. 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. Question 4: What is a balanced chemical equation? Why should chemical equations be balanced? Answer 4: A reaction which has an equal number of atoms of all the elements on both sides of the chemical equation is called a balanced chemical equation.

The law of conservation of mass states that mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products. It means that the total number of atoms of each element should be equal on both sides of a chemical equation. Hence, it is for this reason that chemical equations should be balanced.

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: Chemical reactions that release energy in the form of heat, light, or sound are called exothermic reactions. Example: Mixture of sodium and chlorine to yield table salt. Endothermic reactions: Reactions that absorb energy or require energy in order to proceed are called endothermic reactions. For example: In the process of photosynthesis, plants use the energy from the sun to convert carbon dioxide and water to glucose and oxygen.

Answer Energy is required to support life. The energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen in the cells and provides energy.

The special name of this combustion reaction is respiration. Since energy is released in the whole process, it is an exothermic process.

Question Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions. Answer Decomposition reactions are those in which a compound breaks down to form two or more substances. These reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions in which two or more substances combine to give a new substance with the release of energy.

Question Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

Question What is the difference between displacement and double displacement reactions? Answer In a displacement reaction, a more reactive element replaces a less reactive element from a compound.

In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds. Question In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved. Question What do you mean by a precipitation reaction? Explain by giving examples. Answer: A reaction in which an insoluble solid called precipitate is formed is called a precipitation reaction.

For example:. In this reaction, calcium carbonate is obtained as a precipitate. Hence, it is a precipitation reaction. Question Explain the following in terms of gain or loss of oxygen with two examples each: a Oxidation and b Reduction.

The equation of the reaction involved in heating copper is given below. Answer Iron articles are painted because it prevents them from rusting. When painted, the contact of iron articles from moisture and air is cut off. Hence, rusting is prevented their presence is essential for rusting to take place.

Answer Nitrogen is an inert gas and does not easily react with these substances. On the other hand, oxygen reacts with food substances and makes them rancid. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack.

When oxygen is not present inside the pack, rancidity of oil and fat containing food items is avoided. Question Explain the following terms with one example each.

For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide. For example, the taste and smell of butter changes when kept for long. Rancidity can be avoided by:. Your email address will not be published.

Save my name, email, and website in this browser for the next time I comment. The Reaction involved in this case is as follows: Question 2: Write the balanced equations for the following chemical reactions.

Its chemical formula is CaO. Page no. Answer: a Hydrogen gas and iron chloride are produced. In other words, combination reactions are exothermic. Question Why is respiration considered an exothermic reaction?

Answer: Question What do you mean by a precipitation reaction? Leave a Reply Cancel reply Your email address will not be published.


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