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CBSE class 10 science exam Here�s how to score above 90 | Hindustan Times

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Further, we have to balance the other elements. If we further examine the reaction, no element is found to be unbalanced. This method that we used is called the hit and trial method. Finally, we need to check the accuracy of the equation. To check where the equation is correct, we further tabulate the number of atoms of each element separately.

Number of atoms in Reactants LHS. Number of atoms in Products RHS. The above table clearly reveals that the obtained equation is a balanced equation. Step 1: Enclose all the symbols or formulae in brackets. Step 2: Count the number of atoms in each element on both the sides of the equation.

Step 3: From the above table, it is known that hydrogen has the maximum number of atoms. So to balance hydrogen atoms, multiply H 2 O by 3.

Step 4: Count further the number of atoms in each element on both sides. Now, to balance the atoms in carbon, multiply CO 2 molecules by 2. There are 7 O-atoms on RHS. To make 7 O-atoms at LHS, we have to write 7 2 before O 2 but we can use only whole number to balance the equation, so we write 7 2 before O 2 and multiply the whole equation by 2.

Thus, after removing the brackets we get the final and correct chemical equation. The facts that remain unexplained in a chemical equation are. The physical state of the substances like the changes in the colour during the reaction. The reaction conditions. The changes in the evolution or the absorption of energy. Completion of the reaction.

The physical states of the reactants and products can be represented by using the symbols, s for solid, l for liquid, g for gas and aq for aqueous solution, alongwith their respective formulae. Liberation of gas and precipitation can be represented by and respectively.

The circumstances under which reaction takes place like temperature, pressure, catalyst, etc. The chemical reactions depend upon Class 10th Chemistry Chapter 5 Ncert Solutions Review the type of chemical changes taking place and they are classified as:. When two or more reactants are combined to form a single substance in a chemical reaction, then the reaction is called a combination reaction.

Ex: Calcium Oxide reacts very fast and strongly with water to form calcium hydroxide slaked lime. The reaction given below is highly exothermic, because a lot of heat is liberated during the reaction. Calcium oxide Water Calcium. Quick Lime Hydroxide. This is a reaction in which a single reactant breaks down to form two or more products.

This reaction is opposite to combination reaction. On the basis of the energy form required for the reaction, this reaction is classified into three types:.

Thermal decomposition: This reaction uses the heat energy for decomposition of the reactant. Ferrous Sulphate Ferric oxide Sulpur dioxide Sulphur trioxide. Electrolysis: These reactions use the electrical energy for the decomposition of the reactant molecules. Ex: When electric current is passed through water, it decomposes to give water and hydrogen. Electric current. Water Hydrogen Oxygen.

Photolysis or photochemical decomposition: These reactions use light energy for the purpose of decomposition. Ex: Silver chloride decomposes to produce silver metal and chlorine gas when exposed to sunlight. Silver bromide Silver Bromine. Pale yellow Greyish white yellowish green. A reaction can be exothermic or endothermic depending on whether heat is liberated or absorbed during a reaction.

Exothermic reactions: The reactions in which the products formed along with the liberation of heat, are called exothermic reactions or combustion reactions. Respiration is an exothermic process. The decomposed vegetable matter that turns into compost is also an exothermic process. Ex: Burning of magnesium ribbon.

Magnesium Oxygen Magnesium oxide. Photosynthesis is an endothermic process. All decomposition reactions are endothermic reactions because the reactions require some form of energy like heat, light or electricity.

Chlorophyll Glucose. When a more reactive element takes the place of a less reactive element from its compound, it is called displacement reaction. This reaction is of two kinds:. Single Displacement Reaction: This is a type of chemical reaction where an element reacts with a compound and displaces another element in that compound is called single displacement.

Ex: Zinc is more reactive than copper and displaces Cu from CuSO 4 solution and forms a new product zinc sulphate and copper metal. Zinc metal Copper sulphate Zinc Sulphate Copper metal. Grey solution blue solution colourless Brown.

Double Displacement Reaction: The reaction in which two different ions or groups of atoms in the molecules of a reactant are displaced by each other is called a double displacement reaction. In this reaction, a precipitate is produced so It is also called a precipitation reaction. Ex: When sodium sulphate is added to barium chloride, a curdy white precipitate of barium sulphate and a solution of sodium chloride are formed as end products.

Note: The reaction in which acid or acidic oxide react with a base or basic oxide to form salt and water is called neutralization reactions.

This reaction is a process in which oxygen is added to a substance or removed from a substance or a substance loses an electron s. If a substance gains oxygen during a reaction then the substance is said to be oxidized. If a Oxygen is lost from a substance during a reaction, it is said to be reduced. The substance that oxidizes the other substance is called an Oxidizing agent. The substance that brings a reduction in another substance is called a Reduction agent.

Copper Oxygen Copper oxide. Hydrogen sulphide Oxygen Sulphur Hydrogen oxide. When a reaction has both oxidation and reduction taking place simultaneously then the reaction is called a redox Class 10th Chemistry Chapter 5 Ncert Solutions Limited reaction. In the reaction below, the copper II oxide is losing oxygen and is being reduced while oxygen is added to hydrogen and water is formed.

Copper Hydrogen Copper Water. 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 Class 10th Chemistry Chapter 5 Ncert Solutions Llc 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. Also, there are diagrams that students need to study so that they can score better marks in their exams.

This chapter is really important as all the answers are based on the details provided in the chapter. For this chapter, students will dive into the different concepts of electric current. They will also get to learn important terms such as potential difference, resistance, circuit diagrams, and much more. Also, students will know about the different effects of heating on electrical power and current.

Not to mention that students will get to understand the different symbols used in a circuit diagram. Also, there are some details about the current flow that occurs in a particular circuit and much more. The 13th chapter of Class 10 science deals with important topics such as magnetic fields and different field lines.

Also, students can learn about hard rules, the force on a particular type of current conductor, magnetic fields, and circuits. The chapter is meant to provide an insight into topics such as generators, motors, electromagnetic inductions, and much more. There are 18 questions in the chapter along with a few objective types as well. In the exercises for this chapter, students will also find several numerical solutions.

Students will know about different energy forms that are available to mankind such as non-conventional and conventional forms of energy. There are comparisons between different energy forms and the explanations are provided in the chapter. Also, students will get to know the importance of using several non-conventional types of energy rather than the conventional options.

There are 10 questions in this chapter and some of them are objective types. There are several ecosystems working in the environment and students will get to know about keeping it stable and balanced.

There is also information about ozone layer depletion, food chains, and management of waste. The chapter has a total of 9 questions and 3 are objective ones. The chapter goes through important topics such as management and preservation of different resources that include petroleum, coal, wildlife, forests, and much more.

The chapter consists of 7 questions and students can find all the answers to these questions in our PDF files for the solutions. Unit Name. World of living. Natural Phenomena. Effects of Current. Natural Resources. Total Marks. Type of Questions. Objective Type. Short Answer Type. Long Answer Type. These solutions will help you prior to your exams as you can know more about the marking scheme, question pattern, difficulty level and nature of questions, section-wise marking and so much more.

Here are some benefits of referring to these solutions. By knowing the pattern of different questions that come in the examination, students can easily make sure that their preparation is on point. This way they are more confident and sure about taking the board exam and hence they get to score more marks. It cannot be denied that time management gets better and better with more practice as it helps in boosting the speed of answering the questions during your exams.

So, with total awareness of the answers with the solutions provided by us, you can efficiently manage time. One of the best things about the NCERT solutions that we have for class is that these answers are prepared by teachers and masters who have enough experience in teaching the subject.

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The paper consists of questions with a total of 80 marks and includes different questions of varying length and marking.

There are some practical questions too. The paper is divided into three sections A, B, and C. The 1st section has one mark questions while the second section has a few short answer type questions that are of 3 marks and the third section will have long-answer questions which are mostly of 5 marks each.

The NCERT Solutions for the Class 10 science questions will provide more understanding and knowledge to the students about the chapters. With a clear concept, they will get to understand all the important topics and hence will be able to answer the questions asked in the exams in a better way. Not to mention that it also assists a lot when it comes to increasing the aggregate marks in board exams.

It is not a surprise that science is considered to be one of the subjects where students can score the most. Hence, students need to make sure that they are able to have knowledge and details about all the chapters provided in the book of Class 10 Science. All these solutions and answers are created very carefully under the expertise of masters and professors.

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