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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 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 hydrogen chloride.
Important Questions on 10th Science Chapter 1 What 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.
Chapter Electricity. Chapter Magnetic Effects of Electric Current. Chapter Sources of Energy. Chapter Our Environment. Chapter Management of Natural Resources. They must take care of the deleted topics from the previous syllabus. This will ensure that they do not waste their time in preparing such topics that will not be assessed in the internal assessments and the annual board examination in the current academic session These solutions will certainly help students to improve their approach towards solving a variety of questions in exams.
NCERT books are important for students to prepare not only for the board exams but also for the competitive exams as well. All NCERT books are written by experts after extensive research on each and every topic to provide apt and authentic information to the students. These books cover all the basics and fundamentals on all topics and are ideal for thorough and comprehensive studies to develop the crystal clear concept understanding.
Thus for effective preparation for the exams and get the desired results, students are always advised to follow the NCERT books. All the solutions have been prepared by the subject experts and are provided with a detailed and appropriate explanation. Keep visiting Jagranjosh. Jagranjosh Education Awards Click here if you missed it!
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