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Chapter 5 - Surya Kant Tripathi Nirala. There are two parts of this poem. The first poem, Utsaah is an invocation song. The poet reveals it through clouds. The poem is reflected in the context of Navjivan, and Nirala Ji expressed his feelings through clouds.
In the second poem, the poet in Nahi Rahi expresses his feeling in the form of illustration of Phagun Month. Chapter 6 - Nagarjun. In the first poem, the poet is happy to see the grin of a small child, who has small teeth in his mouth. The second poem Fasal shows crops are the basis of our lives. Chapter 7 - Girijakumar Mathur. This poem defines human life. According to the poem, happiness and pain show their colours in our lives. By remembering old pleasures, the person further increases the misery of the present.
Chapter 8 - Ruturaj. The poet through this poem tries to define new social values by expressing the intimacy and relationship between the mother and daughter.
Chapter 9 - Saviya Prakash. Chapter 10 - Manglesh Dabral. The Sangatkar poem points to the importance of the accompanist who co-ordinates the lead singer. Chapter 11 - Ram Vraksh Benapuri. 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. When copper metal is heated in air, it forms a black colored compound copper oxide. So, the black colored compound is the copper oxide or copper II oxide, CuO.
Question 17 Why do we apply paint on iron articles? Solution: Rust is a soft and porous substance, which gradually falls from the surface of an iron object, and then the iron below starts rusting.
Thus, rusting of iron or corrosion of iron is a continuous process which, if not prevented in time, eats up the whole iron object. So, when we apply paint on iron articles it reduces the rusting of iron. Question 18 Oil and fat containing food items are flushed with nitrogen. Solution: Packaging fat and oil containing foods in nitrogen gas can prevent rancidity. When the fat and oil present in food materials gets oxidised in air , their oxidation products have an unpleasant smell and taste.
When it is surrounded by unreactive gas, nitrogen, there is no oxygen of air to cause its oxidation and make it rancid. Question 19 Explain the following terms with one example each. Corrosion b. Rancidity Solution: a. Corrosion is the process in which metals are eaten up gradually by the action of air, moisture or a chemical on their surface.
Corrosion is caused mainly by the oxidation of metals by the oxygen of air. Example: Rusting of iron is the most common form of corrosion. This is called rusting of iron. The condition produced by aerial oxidation of fat and oil in food which is marked by an unpleasant smell and taste is called rancidity. Example: Rancidity can be retarded by keeping food in a refrigerator.
The refrigerator has a low temperature inside it. When the food is kept in a refrigerator, the oxidation of fat and oil in it is slowed down due to low temperature.
So, the development of rancidity due to oxidation is retarded. Question 20 Why should a magnesium ribbon be cleaned before burning in air? Solution: To remove the oxide layer and facilitates rapid burning.
Question 21 Write the balanced equation for the following chemical reactions. Question 22 Write a balanced chemical equation and state symbols for the following reactions. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride b. Sodium hydroxide solution in water reacts with hydrochloric acid solution in water to produce sodium chloride solution and water.
Question 24 Why does the colour of copper sulphate solution change when an iron nail is dipped into it? Solution: In this reaction, iron displaces copper from copper sulphate solution. The deep blue colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate. A red-brown coating of copper metal is formed on the surface of the iron metal.
This displacement reaction occurs because iron is more reactive than copper. Question 25 Identify the substances that are oxidised and the substances that are reduced in the following reactions. The addition of oxygen is Called oxidation.
So the substance that is oxidized is sodium Na. In this reaction, copper oxide CuO gives the oxygen required for the oxidation of hydrogen; therefore, copper oxide is the oxidizing agent. Hydrogen is responsible for removing oxygen from copper oxide; therefore, hydrogen is the reducing agent here. Question 1. When crystals of lead nitrate are heated strongly in a dry test tube a crystals immediately melt b a brown residue is left c white fumes appear in the test tube d a yellow residue is left Answer: b Pungent smelling, brown fumes are evolved due to NO 2 gas and brown coloured residue of lead oxide PbO is left.
Question 2. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? In acidic medium, KMnO 4 oxidises ferrous sulphate to ferric sulphate. Question 3. Dilute hydrochloric acid is added to granulated zinc taken in a test tube.
The following observations are recorded. Practice with the Class 10 Hindi Kshitij solutions prepared by our Hindi experts. Get detailed explanations on questions related to the autobiographical poem by Jayashankar Prasad.
Every story has some emotion or some lesson. For scoring good marks in your CBSE Class 10 exams, you must demonstrate your conceptual clarity and understanding of the topics by correctly answering the questions. Your Class 10 Hindi syllabus is divided into different parts.
The chapters cover engaging stories and poems based on real-life situations, historical events and more. Are you afraid of Hindi lessons? Hindi is one of those language subjects which can give you a tough time if you are not a native speaker. These chapter solutions will be useful while studying the chapters from your Hindi syllabus.
As a student, you may need help while completing your homework or to prepare for the exams. Class 10 is one of those years when every subject, whether a favorite of yours or not, should be given equal attention. For scoring marks in Hindi, your writing skills should be excellent. Of course, you need to know what to write, but it is also important to understand how to write the answers. While learning Hindi, you may study all the chapters, but writing practice will strengthen your command over the language.
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