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NCERT Solutions for Class 9 Math Chapter 6 - Lines And Angles

Science textbook of Class 10th deals classs the disciplines such as Physics, Chemistry, Biology and Environmental Science as integrated. However, as per the examination point of view, we can divide ncerg book into three parts Physics, Chemistry and Biology. Environment Science part is covered in the Biology syllabus.

You can select your desired chapter from the list and start your learning. As previously stated, Environment Science part is covered in the Biology syllabus. So we have total three subjects in Science subject, Physics, Chemistry and Biology. NCERT Solutions for Class 10 Science will introduce you to Ncert Book Class 10th Exercise 3.1 Mp3 the basic concepts of the chapters as the questions 10tn given that check your all round understanding of the chapter. You can get ahead of your competitors through class 10th ncert 3.1 os solutions.

You also need to pay attention to time management to get good numbers. To divide this you should divide each topic according class 10th ncert 3.1 os time.

Give more and more time to ncerf topic in which you are weak. We often do not give full time to repeat the topics that come to us. It is necessary that you understand the chapter first and then proceed. Many times what happens is that you go to the exam by rote learning class 10th ncert 3.1 os if the question in the paper gets a little different then there is panic. In such a situation, if you understand the chapter concepts, then you will be ready to answer in every way.

The first unit has total five chapters. The first chapter is about the chemical reactions and equations in which we mcert learn about how to class 10th ncert 3.1 os chemical equations and balance. Also, we will learn about the various types of chemical reactions.

In the second chapter, xlass will learn about the various types of acids, bases and salts and their reactions class 10th ncert 3.1 os metals and non-metals.

The third chapter will take us to the world of metals and non-metals where we will learn about their properties and reactions among. The fourth chapter is about the carbon and its compounds where we will learn about the properties of carbons and chemical substances containing carbon. In the fifth chapter, we will learn about the classification of elements and their evolution.

The Second unit consists of four chapters that are from sixth to ninth. The sixth chapter is about the various life processes which human need for their survival. In the seventh chapter, we will talk about the parts of the human body which are engaged in control and coordination activities.

The eighth chapter deals with reproduction activities in unicellular and multicellular organisms. The ninth chapter, we will learn how the offsprings look alike. The third unit is How things works which have four chapters.

In the tenth chapter, we will learn about light and its phenomena reflection and refraction in a detailed manner. The eleventh chapter is about the human eye and some optical phenomena in nature. The twelfth chapter deals with the electricity in which we will learn electric circuit and resistance.

In the thirteenth chapter, magnetic effects of electric current and its applications. The fourth unit has three chapters in it. The fourteenth chapters talk about the various sources of energy such as conventional and non-conventional sources. The fifteenth chapter is about our clsss in which we will learn about the eco-systems, food chains and how human activities contribute ncdrt degrading its quality.

The last chapter is about the conservation of natural resources. In previous classes, students were introduced to physical and chemical changes. The chemical changes signify the chemical reactions.

The indicators of chemical reactions are explained with some indicators like change in physical state, change in color, change in temperature and evolution of gas.

These are explained with some experimental examples. Ncsrt that writing of chemical equation has been 31. It is symbolic representation of chemical reactions. Also, it has been explained that how such equations can be more informative. For example, balancing a chemical equation class 10th ncert 3.1 os signify that the chemical reactions follow law of conservation of mass.

Other information like physical states and conditions required for reactions are mentioned. After that various types of chemical reactions are explained are discussed. The types of chemical reactions are �combination reaction, decomposition reaction, displacement reaction, double decomposition reaction. On basis of energy, exothermic and endothermic reactions are mentioned. Redox reactions are explained which are combination of reduction reaction and coass reaction.

All types of reactions are explained with suitable example with their respective chemical equation. Chapter 2 - Acid, Base and Salts Acid and bases are studied in earlier ncer. Acids are defined as substances which are sour ps taste clas turn blue litmus red.

Examples of acids are sour fruits like, Bases are defined as substances which are bitter in taste and turns red litmus blue. Examples ckass bases are neem, clove, vinegar. Here, acids and bases class 10th ncert 3.1 os defined chemically.

Bases are chemically those substances oos generate OH- ions in aqueous solutionIf not they are weak acids. After that, various chemical and olfactory indicators are discussed; clasw indicates the presence of acids or base in the solution.

Bases are said to be strong if whole of them get dissociated in water class 10th ncert 3.1 os form OH- ions. For clqss, Methyl orange is a chemical indicator. It turns red in acidic solution and yellow in basic solution.

Olfactory indicators are indicators which changes odor after class 10th ncert 3.1 os in contact with acid and 1th. For example, smell of clove vanishes when kept class 10th ncert 3.1 os contact with acid. After that acids and bases reactions are discussed with metals, metal oxides and metal carbonates.

Reactions between classs and bases class 10th ncert 3.1 os also discussed. They are known as neutralization reactions. Salt is one of the products formed by acid, base reaction.

The various types of salts are discussed based on the strength of acid or base. The pH scale Indicates if the solution is acidic, basic our neutral. It is an scale from So, is acidic, 7 is neutral, basic solution. Universal indicator is a mixture of several indicators. Chloro-alkali process is performed of salt 10tg.

The various chemical substances are formed after reactions, directly or in-directly are used for various process. Their formation and uses are explained in this chapter. Chapter 3 - Metals and Non-Metals The chapter starts with physical properties of metals and non-metals.

The parameters discussed are some class 10th ncert 3.1 os properties, like melting and boiling points, physical state at room temperature, ductility, malleability, tensile strength. The metals and non �metals are differentiated on the basis of physical properties. But there are some expectations based on physical properties. For example iodine is non-metal but has lustrous appearance as metal. Mercury is metal but liquid at room temperature.

There are more such exceptions. Therefore, classification of metals and non-metals, are based on chemical properties. Chemical reactions of metals with oxygen gas, water, acids and other metal salts are discussed. The reactions and their condition depends upon the reactivity series.

The metals on top of reactivity series are sodium and Potassium. They perform vigorous hcert. Nature of metallic oxides is discussed. Generally Metal oxides are basic in nature. But, 10tn of them like aluminum oxide and zinc oxide can be both acidic and basic and hence known as ncet oxides. After that how such reactions takes place is discussed.

10tg bond ncerr is discussed. Such bond formation can be represented in two forms. Electrons are loosed by metals and gained by non-metals. One get positively charged and another get negatively charged. They get attracted and a strong bond is formed. The first one is electronic configuration. The bond formation is discussed through Bohr model. Another method is Class 10th ncert 3.1 os structure or electron-dot structure.

The metals and non-metals are written with their symbol and dots.

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There are two methods of finding solution of a pair of Linear equations in two variables. Consider the standard form of linear equations in two variables.

Pair of lines representing the equations coincide. Pair of lines representing the equations are parallel or do not intersect at any point. Sometimes pair of equations are not linear or not in standard form , then they are altered so that they reduce to a pair of linear equations in standard form. Solution: Ex 3. A system of linear equations may have o solution or one solutions or infinite many solutions.

For a parallel lines, there is no solution at all. If all the lines are intersecting at one point, then we can say that the system of linear equations are consistent and have a unique solution. Download Exercise 3. Class 10 Maths Exercise 3. Class 10 Maths Chapter 3 Exercise 3.

Important Terms for Pair of Linear Equations The graph of a pair of linear equations in two variables is represented by two lines. If the lines intersect at a point, the pair of equations is consistent. This information is important for writing class 10 maths ex 3. When it comes to linear equations in two variables, then there are infinitely many solutions. The substitution method should be followed in that case.

There are also various cases that one can come across when writing class 10 maths chapter 3 exercise 3. Some of those cases are discussed below. Unique Solutions. The solution will be unique for any linear equation in two variables if the variables intersect one another at a single point. The slope of the line that is formed by the two equations should also not be equal. This means that if m 1 and m 2 are the two slopes of equations of two lines in two variables, then the equations will have a unique solution if:.

No Solution.

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