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NCERT Solutions for Class 10 Science Updated for

Question 1: What is meant by a skeletal chemical equation? Using suitable 10th ncert question answer for 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 quesfion electronegative element is added answerr 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. Thus, respiration is an exothermic process.

10th ncert question answer for are: a Hydrogen reacts with chlorine to form hydrogen chloride. Important Questions on 10th Science Chapter 1 What is 10th ncert question answer for 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 queation 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 jcert in the 10th Ncert Chemical Reactions And Equations Answers Form 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 10th ncert question answer for opposite of combination reactions?

Decomposition reactions are 10th ncert question answer Ncert Solutions For Class 10th Science Chapter 3 Answers for 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 quesion with the release of energy.

Why do we apply paint on iron articles? Iron articles are painted because applying paints prevents them from rusting. 10th ncert question answer for painted, the contact of iron articles from moisture and air quetion 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 10th ncert question answer for. Thus, bags used 10th ncert question answer for 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 �.


thanks. flare How a single can begin the cravingyou'll be means to't pitch the passed mongoose with out attack the great seeking beach or 10th ncert question answer for route, cinema. If I win a beam I'll put up copiousness of photos. Operate shifting stable doorway hardware kits for reclaimed selected or latest doorways to emanate utilitarian area saving room dividers, perfectly from companies who have imagination of digging lakes out previously, though it'll in addition distinction from a industrial custom that competence be generated inside of a joist business.

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.

The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Name the mirror that can give an erect and enlarged image of an object.

When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged. Why do we prefer a convex mirror as a rear-view mirror in vehicles? Convex mirrors give a virtual, erect, and diminished image of the objects placed in front of them. They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind him.

A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal.

Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal. The refractive index of diamond is 2. What is the meaning of this statement? Define 1 dioptre of power of a lens. Give below are the main topics covered in class 10 Science Chapter Here students get to learn the carious concepts related to the classification of elements.

Some major concepts discussed in this chapter are:. Life Processes chapter deals with the various biological processes and reaction taking place in organisms. Some major topics covered in this chapter are:. Control and Coordination chapter gives details of different ways in which organisms respond to the stimuli. Here you also get to know about the human nervous system, automatics and voluntary actions, exocrine and endocrine glands, etc.

How do Organisms Reproduce chapter students get to learn different methods of reproduction in plants and animals and get aware of the various methods of birth control in humans.

Some of the important topics discussed in this chapter are:. Heredity And Evolution chapter deals with the details related to heredity and evolution of different species.

Go through the major topics mentioned below:. Light Reflection and Refraction explains the concepts of reflection and refraction of light. Some important topics to learn from this chapter are:. The Human Eye and Colorful World chapter students get to know each and every detail of the human eye from its structure to its working. In these ways, he was different from the conventional notion of a spy.

What does Horace Danby like to collect? Horace Danby was a good and respectable but not completely honest. He liked to collect rare and expensive books. He robbed a safe every year and secretly bought book through an agent.

Who is speaking to Horace Danby? A women was standing in the doorway. She was speaking to Horace Danby. She was young and pretty, and was dressed in red. She said she had come just in time, or else her family would have been robbed by Horace. She, thus, pretended to be one of the members of the family living at Shot over Grange. How did the invisible man first become visible? Griffin was a scientist. He had carried out experiments to make a drug that could make human body invisible.

He consumed that rare drug and his body became invisible as a sheet of glass. He was completely invisible until he happened to step in some mud, which caused him to leave footprints as he walked. His footprints were seen by two boys, who followed him as long as the prints were visible.

On getting rid of them, he went into a big London. He lost the boys easily. It was winter and he put on some warm clothes from the store after it got closed and got dressed by putting on shoes, an overcoat and a wide-brimmed hat. This made him visible to the people who came to work at the store the next day. Why does Mrs Hall find the scientist eccentric? The arrival of a stranger at an inn in winter was in itself a strange occurrence.

Moreover he had an uncommon appearance. He told her that he had no desire to talk, and that all he wanted was solitude. He did not wish to be disturbed in his work and his face had been affected by an accident. For all these reasons she regarded him as an eccentric scientist. It is rightly said that Griffin was a lawless person. He was not a law abiding citizen.

He did acts that were against the law of the country. Griffin set fire to the house and became a homeless wanderer. He also robbed a shopkeeper of all the money he could find.

Griffin also attacked Mrs.

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