These ncert book chapter wise questions and answers are very helpful for CBSE board exam. By AAA criterion of similarity. If SSS criterion of similarity. These two triangles are not similar as they do not satisfy SAS criterion of similarity. In CDO, we. To Prove :. We have. Let AB the vertical pole and AC be its shadow. Also, let DE be the vertical tower and DF be its shadow. Joined BC and EF.
Nceert AA-similarity criterion. To prove :. By SAS-criterion of similarity. Ncert solution class 10 Maths includes text book solutions from Mathematics Book. Ques nxert. Plz rectify it. Coward act. The bopk question in this exercise Q14 is wrongly. The 3 of ncert book class 10th question does not match that question but the site has just put up solution of Q12.
Plz understand my suggestion so as to help other students avoid any deduction of valuable marks in boards. Hey in Q14 what you did 01th wrong�please read 3 of ncert book class 10th question question again n then post the answer it is completely different from Q There are about pf � 30 comments complaining about question number 3 of ncert book class 10th question I want to ask you a question that do you even read the comments???
Such act was not admirable from a educational site. You shoul correct it. Howeverremaining answers was right. It helped me. Guyzz the q14 is right This is the property og side and median For info. About this property contact me At facebook page � 10th Class Ka Ncert Book Your Mukul Bhavesh. Guys first see and understand the question then make a comment. This was the website i trusted the most�. Nd now its very disappointing to see the mistake�students are here so that they can understand the sums�nd if here only mistake occurs, wat will the students learn???
Save my name, email, and website in this browser for the next time I comment. Download Now. Do recheck. Question no 14 is not solved correct please go through it. Hopeless guys 14 question is wrong I was thinking that. Everything is fine but question no. Just copy pasted the 12th question. Q1 ka 4th wrong h becoz book mai kaha ncetr vo 10tu triangles h.
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Answer: Malleable : A metal that can be beaten into thin sheets on hammering is called malleable. Ductile : A metal which can be drawn into thin wires is called ductile. Question 1 Why is sodium kept immersed in kerosene oil? Answer: Sodium is highly reactive. So it is kept immersed in kerosene oil to prevent its reaction with oxygen, moisture and carbon dioxide of air to prevent accidental fires. Question 2 Write equations for the reactions of i iron with steam.
Question 3 Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows :.
Answer: i B is the most reactive metal because it gives displacement reaction with iron II sulphate. Metal A is less reactive because it displaces copper from its salt solution. Metal C is still less reactive because it can displace only silver from its salt solution and metal D is the least reactive because it cannot displace any metal from its salt solution.
Question 4 Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H 2 SO 4. Answer: Hydrogen gas is produced when dilute hydrochloric acid is added to a reactive metal.
Question 5 What would you observe when zinc is added to a solution of iron II sulphate? Write the chemical reaction that takes place. Answer: Zinc is more reactive than iron. Therefore, when zinc is added to a solution of iron II sulphate, then the greenish colour of iron II sulphate solution fades gradually due to the formation of colourless zinc sulphate solution and iron metal is deposited on zinc.
Question 1 i Write the electron dot structures for sodium, oxygen and magnesium. Question 2 Why do ionic compounds have high melting points? Answer: The ionic compounds are made up of positive and negative ions. There is a strong force of attraction between the oppositely charged ions, so a lot of heat energy is required to break this force of attraction and melt the ionic compound. Due to this, ionic compounds have high melting points. Question 1 Define the following terms : i Mineral, ii Ore and iii Gangue.
Answer: i Mineral : The natural materials in which the metals or their compounds are found in earth are called minerals.
Question 3 What chemical process is used for obtaining a metal from its oxide. Answer: Reduction process is used for obtaining a metal from its oxide. For example, zinc oxide is reduced to metallic zinc by heating with carbon. Besides carbon, highly reactive metals like sodium, calcium, aluminium etc.
These displace metals of low reactivity from their oxides. Question 1 Metallic oxides of zinc, magnesium and copper were heated with the following metals :. In which cases will you find displacement reactions taking place? Answer: A more reactive metal can displace a less reactive metal from its oxide. But out of zinc, magnesium, and copper metals, magnesium is the most reactive, zinc is less reactive whereas copper is the least reactive metal.
Question 3 What are alloys? Answer: An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal. For example, bronze is an alloy of copper and tin. Metals and Nonmetals Class 10 Question 1. Which of the following pairs will give displacement reactions? Answer: d AgNO 3 solution and copper metal. Question 2. Which of the following methods is suitable for preventing an iron frying pan from rusting?
Answer: c Applying a coating of zinc. Question 3. An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be a calcium b carbon c silicon d iron Answer: a Calcium. Question 4. Food cans are coated with tin and not with zinc because a zinc is costlier than tin b zinc has a higher melting point than tin c zinc is less reactive than tin d zinc is more reactive than tin.
Answer: d Zinc is more reactive than tin. Metals and Non metals Class 10 Question 5. You are given a hammer, a battery, a bulb, wires and a switch. Answer: a Metals can be beaten into thin sheets with a hammer without breaking. Non-metals cannot be beaten with a hammer to form thin sheets. Non-metals break into pieces when hammered.
Metals are malleable, while non-metals are non-melleable. When metals are connected into circuit using a battery, bulb, wires and switch, current passes through the circuit and the bulb glows. When non-metals like sulphur are connected, the bulb does not light up at all. Metals are good conductors of electricity. Metals are good conductors of electricity so these can be used for electrical cables.
Question 6. What are amphoteric oxides? Give two examples of amphoteric oxides? OR Write chemical equations that show aluminium oxide reacts with acid as well as base.
In other words, metal oxides that react wtih both acids and bases to form salt and water are called amphoteric oxides. Aluminium oxide and zinc oxide are amphoteric in nature. Question 7. Name two metals which will displace hydrogen from dilute acids and two metals which will not.
Answer: i Metals above hydrogen in the activity series like Class 10th Hindi Ncert Book Template sodium and magnesium displace hydrogen from dilute acids. Question 8. In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Question 9. Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in the figure. Answer: i Dry litmus paper � no action. Question State two ways to prevent the rusting of iron. Answer: Ways to prevent rusting of iron are : a By painting b By galvanizing. What type of oxides are formed when non-metals combine with oxygen? Answer: Non-metals combine with oxygen to form acidic oxides or neutral oxides.
Give reasons : a Platinum, gold and silver are used to make jewellery. Answer: a Platinum, gold and silver are used to make jewellery because these are malleable and ductile. These are highly resistant to corrosion. This is due to their low ignition temperature and high reactivity.
This layer prevents aluminium to react with other substances. Since it is easier to obtain metals from their oxides than from their carbonates or sulphides directly, therefore, the carbonate and sulphide ores are first converted to oxides for extracting the metals. You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
Answer: The sour substances such as lemon or tamarind juice contain acids. These acids dissolve the coating of copper oxide or basic copper carbonate present on the surface of tarnished copper vessels and makes them shining red-brown again. Differentiate between metal and non-metal on the basis of their chemical properties. A man went door-to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments.
An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically.
The lady was upset but after a futile argument the man beat a hasty repeat. Can you play the detective to find out the nature of the solution he has used? Answer: The dishonest goldsmith dipped the gold bangles in aqua-regia which contains 1 part of concentrated nitric acid and 3 parts of concentrated hydrochloric acid, by volume.
Aqua-regia dissolved a considerable amount of gold from gold bangles and hence reduced their weight drastically. The dishonest goldsmith can recover the dissolved gold from aqua-regia by a suitable treatment. Give reasons why copper is used to make hot water tanks and not steel analloy of iron.
Answer: i Copper is a better conductor of heat than steel. But steel corrodes easily. Metals and non metals: Properties of metals and non-metals, reactivity series, Formation and properties of ionic compounds, Basic metallurgical processes, corrosion and its prevention.
Question 1 What are amphoteric oxides? Give two examples of amphoteric oxides. Solution: Amphoteric oxides are the oxides, which react with both acids and bases to form salt and water. Question 2 Name two metals, which will displace hydrogen from dilute acids, and two metals which will not.
Solution: Very reactive metals like Zn and Mg displace hydrogen from dilute acids. On the other hand less reactive metals like Cu, Ag, etc. Question 3 In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte? Solution: Anode is impure, thick block of metal M. Electrolyte is a suitable salt solution of metal M.
Metals and nonmetals Class 10 PDF. Question 4 State two ways to prevent the rusting of iron. Solution: By coating the surface of iron by rust proof paints. By applying oil or grease to the surface of iron objects so that supply of air consisting of moisture is cut off form the surface. Question 5 What types of oxides are formed when non-metals combine with oxygen? Solution: When non-metals combine with oxygen it forms either neutral or acidic oxides.
Metals replace hydrogen from dilute acids, where as non-metals do not. Carbonate and sulphide ores are usually converted into oxides during the process of extraction. Solution: i. Metals are electropositive in nature. They readily lose electrons. These electrons reduce the protons liberated from the acid to liberate hydrogen gas, where as non-metals possess a tendency to gain electrons and hence they do not furnish electrons to protons liberated from acids.
Hence H 2 gas is not liberated. As it is easier to reduce metal oxides to metal, prior to reduction, metal sulphides and carbonates must be converted to oxides. Question 7 Differentiate between metals and non-metals on the basis of their chemical properties. Question 8 Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time.
Solution: This is due to the surface oxidation of metals when exposed to moist air. For e. CuCO 3. Similarly silver becomes black due to the formation of black Ag 2 S and Aluminium forms a white coating of Al2O3 on its surface.
Question 9 State which of the following metals would give hydrogen when added to dilute hydrochloric acid. Iron, ii. Copper iii. Magnesium Copper does not react with dilute hydrochloric acid at all. This shows that copper is even less reactive than iron. Question 10 Name a non-metallic element, which conducts electricity. Solution: Carbon in the form of graphite conducts electricity, as there is a free electron in each carbon atom, which moves freely in between the hexagonal layers.
Question 11 Which metals do not corrode easily? Solution: Gold and platinum and other noble metals do not corrode in air. Question 12 What are alloys? They are:. Through the answers given in this solution, students can not only grasp the lessons but also score high in boards.
It has been authored by Rahi Masoom Raza. It is a story which depicts the love, brotherhood, and friendship between two boys belonging from separate religions. The two main characters in this chapter are Iffan and Topi Shukla. Their brotherhood had no barriers and was beyond caste, creed, or religion. The answers given in this chapter of NCERT solution sticks to the text and unveils implicit meanings of the story.
Question 1: The first question in this chapter is about Iffan. Question 2: The second question in this chapter comes with a short answer. Here, students will have to give the exact reason in brief. The answer to this question will be brief yet precise.
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