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Flip a vessel over in sequence which a bottom is indicating up? We presumably can't surprise the fish to pour 10th science ncert question answer edition up, we can right away begin to be at home your joist as well as proceed gluing it in place. I've question. The runabout is the tiny ship used for quicker navigation as well as transferring about quesstion of a water.
For example:. While, in a combination reaction, two or more substances simply combine to form a new substance. Question 12 Write one equation each for the decomposition reactions where energy is supplied in the form of heat, light or electricity.
OR Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity. Question 13 What is the difference between displacement and double displacement reactions? Answer: In displacement reactions, a more reactive metal displaces a less reactive metal from its solution.
In double displacement reactions, two reactants in solution exchange their ions. Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
Question 15 What do you mean by a precipitation reaction? Explain by giving examples. Answer: A reaction in which an insoluble solid called precipitate is formed that separates from the solution is called a precipitation reaction. Question 16 Explain the following in terms of gain or loss of oxygen with two examples each: a Oxidation and b Reduction. Answer: a Oxidation : The addition of oxygen to a substance is called oxidation.
The black coloured compound is copper oxide CuO. The reaction involved is. Question 18 Why do we apply paint on iron articles? Answer: Paint does not allow iron articles to come in contact with air, water and saves iron articles from damage due to rusting. Question 19 Oil and fat containing food items are flushed with nitrogen.
Answer: To keep food items fresh and save from getting oxidised, food items are flushed with nitrogen. Question 20 Explain the following terms with one example each a Corrosion, b Rancidity. Answer: a Corrosion : It is the process in which metals are eaten up gradually by the action of air, moisture or a chemical such as an acid on their surface. Example : When iron is exposed to moist air for a long period of time, its surface acquires a coating of a brown, flaky substance called rust.
Rancidity spoils the food materials prepared in fats and oils which have been kept for a considerable time and makes them unfit for eating. Rancidity can be prevented by adding anti-oxidants to foods containing fats and oils. It can also be prevented by flushing fat and oil containing foods with nitrogen before sealing. Question 1 Which of the given statements about the reaction below are incorrect? Lead is getting reduced b. Carbon dioxide is getting oxidised c. Carbon is getting oxidised d.
Lead oxide is getting reduced i a and b ii a and c iii a , b and c iv all Solution: i a and b. Question 2 The above reaction is an example of a i.
Combination reaction ii. Double displacement reaction iii. Decomposition reaction iv. Displacement reaction Solution: iv Displacement reaction. Question 3 What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
Hydrogen gas and iron chloride are produced b. Chlorine gas and iron hydroxide are produced c. No reaction takes place d Iron salt and water are produced Solution: Hydrogen gas and iron chloride are produced. Solution: An equation for a chemical reaction is an equation in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
In other words, the mass and the charge are balanced on both sides of the reaction. Hydrogen gas combines with nitrogen to form ammonia b. Hydrogen sulfide gas burns in air to give water and sulfur dioxide c. Barium chloride reacts with Aluminium sulfate to give Aluminium chloride and a precipitate of barium sulphate d. Potassium metal reacts with water to give a potassium hydroxide and hydrogen gas Solution: a. Question 6 Balance the following chemical equations. Question 8 Write the balanced chemical equation for the following and identify the type of reaction of each case.
Solution: a. Question 9 What is meant by exothermic and endothermic reactions? Solution: An exothermic reaction is one that releases heat. If 1 mole of N 2 molecule reacts with 1 mole of O 2 molecule, the heat of KJ has to be supplied to initiate the reaction to give 1 mole of NO molecule. This means that the bonds between N � N and O � O are so strong that they do not break easily. N 2 has triple covalent bond between the two N atoms.
O 2 has a double covalent bond. Thus energy has to be put into the reaction to break the strong bonds. Thus the above reaction is a good example of an endothermic reaction. Solution: During respiration, glucose combines with oxygen in the cells of our body to form carbon dioxide and water along with the production of energy.
Write equations for decomposition reactions. Solution: Essentially, decomposition reactions are the opposite of combination reactions. A compound decomposes i. Most decomposition reactions are endothermic. Another example of decomposition reaction is the heating of calcium carbonate sea shells, chalk :. Question 12 Write one equation each for decomposition reactions in which energy is supplied in the form of heat, light or electricity?
Solution: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide:. Write relevant equations for the above?
Solution: The difference between the displacement and double displacement reactions is that in a displacement reaction one element displaces another by virtue of it being more reactive whereas in a double displacement two anions and two cations switch places between two compounds respectively. Thus Zn displaces Cu in the salt form. Zn is more reactive than Cu. Question 14 In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal.
Explain by giving examples: Solution: A precipitation reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of solution as a solid. This insoluble compound is called a precipitate.
An example of a precipitation reaction Aqueous silver nitrate AgNO3 , when added to a solution containing potassium chloride KCl , precipitates a white solid, and silver chloride is observed. Solution: The shiny brown colored element X is copper metal Cu. State the laws of refraction of light. What is meant by refraction of light? Important Questions on 10th Science Chapter 10 Define the principal focus of a concave mirror. 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.
Chemical Reactions and Equations chapter explains the concepts related to chemical reactions and equations. Here, you will know different types of reactions taking place in the surrounding. Some important topics explained in this chapter are:. Acids, Bases and Salts chapter mainly explains the difference between acids, bases and salts. It also deals with various types of reactions related to these three forms of chemical compounds. Some important topics involved in this chapter are:.
Important topics covered in this chapter are:. Carbon and its Compounds chapter describes various features of carbon element and different compounds formed by it. 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.
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