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NCERT Solutions for Class 9 Science Chapter 3 Atoms and Molecules - Free PDF
Click here ?? to get an answer to your question ?? Class 10th ncert solutions of science chapter� For this eye lens becomes thinner and its focal length increases as the object is moved away from the eye. Why do stars twinkle? Answer-. The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth�s atmosphere, undergoes refraction continuously before it reaches the earth. The atmospheric refraction occurs in a medium of gradually changing refractive index. Explain why the planets do not twinkle? Answer. 10th NCERT (CBSE) - Science (Chemistry). Chapter 1, Chemical Reactions and Equations. NCERT Solutions of Science Textbook Chapter Exercise Questions. Question Which of the statements about the reaction below are incorrect? 2PbO + C > 2Pb + CO2�. (a) Lead is getting reduced. Class 10 Science important questions can be a more beneficial to the students. It is not an easy task to score high in exams especially in Science subject. You need to understand the concepts in dept and complex topics. Important Questions for Class 10 Science CBSE Chapter Wise. An efficient preparation by solving a lot of questions from each chapter is necessary. Without knowing important questions from each topic it may difficult to attend the examination.� In NCERT books, you will find questions at the end of chapters. These can be short or long answer type quizzes, match-the-following or fill-in-the-blanks questions. Thus, in order to score optimum marks in the board papers, it is very important for the students to practice a variety of questions.

Question 1: What is meant by a skeletal chemical equation? Using suitable chemical reaction, differentiate between a skeletal chemical equation and a balanced chemical equation. Answer 1: If the number of atoms of any element in a chemical equation is not equal on both sides, then it is a skeletal equation.

For example:. Here, the Ncert Solutions Class 10th Chemistry Chapter 1 Question number of chlorine and hydrogen atoms are not equal on both sides. In a Balance equation, the numbers of atoms of different elements on both sides of a chemical equation are equal.

Question 2: Explain the following terms with examples in each case: i Oxidation and ii Reduction. Answer 2: i Oxidation: it us a process a in which oxygen or any electronegative element is added up or b hydrogen or any electropositive element is removed. Examples are: a Sulphur burns in the air with a blue flame to form sulphur dioxide. Here oxygen is added up to sulphur. Question 3: Why is respiration considered an exothermic reaction? Answer 3: During digestion, food is broken down into simpler substances.

Food like rice, potato and bread are made up of carbohydrates. These carbohydrates are further broken down into glucose. Glucose during respiration inhalation of oxygen is oxidised with the liberation of energy as shown below. Thus, respiration is an exothermic process. Examples are: a Hydrogen reacts with chlorine to form Class 10th Science Chapter 7 Ncert Solutions Uk hydrogen chloride. Important Questions on 10th Ncert Solutions Of Class 10th Chemistry Chapter 2 Answer Science Chapter 1 What Hindi Class 10th Ncert Question Answers System is a balanced chemical equation? Why should chemical equations be balanced?

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. Why is respiration considered an exothermic reaction? 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.

Why are decomposition reactions called the opposite of combination reactions? Decomposition reactions are those in which a compound breaks down into 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.

Why do we apply paint on iron articles? Iron articles are painted because applying paints 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.

Oil and fat containing food items are flushed with nitrogen. Nitrogen is an inert gas at room temperature and does not easily react with oil and fat containing items. 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. Chapter 2: Acids, Bases and Salts �.

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