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Revisit concepts such as ductility, malleability, displacement reaction, mineral, ore, gangue etc. Also, know the steps to balance chemical equations. Learn about the properties of metals and non-metals with CBSE Class 10 Chemistry textbook solutions , topic notes and concept videos.
Concept insight: For answering this question , write the balanced chemical equations. Zinc is more reactive than iron. Therefore, if zinc is added to a solution of iron II sulphate, then it would displace iron from the solution and a colourless solution of zinc sulphate is formed.
Concept insight: For answering this question, remember that metals lose electrons and form positively charged cations. Non- metals gain electrons and form negatively charged anions. A more reactive metal displaces a less reactive metal from its oxide. Out of zinc, magnesium and copper, magnesium is the most reactive, zinc is less reactive and copper is the least reactive.
Concept insight: The key to this answer is the displacement reaction. A displacement reaction takes place when a more reactive metal is able to displace a less reactive metal from its salt solution. Concept insight: For this question, write all the chemical properties of metals and non- metals. Concept insight: For answering this question, recall that what is it which reacts with gold.
Enter the OTP sent to your number Change. Resend OTP. Don't miss this! Ok Cancel. Ok Choose Chapter. Ok Choose Topic. Yes No. Choose Subjects. Choose Chapters. Chapter 3 - Metals and Non-metals Exercise 40 Solution 1. If only name of the metal is asked, write the name only. Malleable: Substances that can be beaten into thin sheets on hammering are called malleable.
For example - most of the metals like gold are malleable. Ductile: Substances that can be drawn into thin wires are called ductile. For example -most of the metals like copper and aluminium are ductile. Concept insight: For answering this question, write the complete definition of melleable and ductile.
Remember the key words - malleable related to thin sheets and ductile related to wires. Chapter 3 - Metals and Non-metals Exercise 46 Solution 1. Sodium is a very reactive metal. It combines explosively with air as well as water.
Hence, it catches fire if kept in open. Therefore, to prevent accidental fires and accidents, sodium is kept immersed in kerosene oil. Concept insight: The key to this answer is that sodium is a very reactive metal. Hydrogen gas is evolved when dilute hydrochloric acid is added to a reactive metal. When iron reacts with dilute H 2 SO 4 , iron II sulphate with the evolution of hydrogen gas is formed.
Chapter 3 - Metals and Non-metals Exercise 49 Solution 1. Ionic compounds have strong electrostatic forces of attraction between the ions. Therefore, it requires a lot of energy to overcome these forces and melt the ionic compounds. That is why, ionic compounds have high melting points. Concept insight: The key to this answer is in the type of bonding that exists in ionic compounds.
Chapter 3 - Metals and Non-metals Exercise 53 Solution 1. Concept insight: For answering this question, write the proper definition of all the three terms. The metals at the bottom of the reactivity series are mostly found in free state. For example: gold, silver and platinum.
Concept insight: The key to this answer is that what type of metals will exist in free state. The chemical process used for obtaining a metal from its oxide is reduction. In this process, metal oxides are reduced by using suitable reducing agents such as carbon or by highly reactive metals to displace the metals from their oxides. For example, zinc oxide is reduced to metallic zinc by heating with carbon.
Concept insight: The key to this answer is that the conversion of metal oxide to metal is a reduction of metal oxide. Chapter 3 - Metals and Non-metals Exercise 55 Solution 1. Less reactive metals i. For example - gold. Concept insight: More reactive a metal is, more likely it is to be corroded. Less reactive a metal is, less likely it is to get corroded.
Alloys are homogeneous mixtures of two or more elements. The elements could be two metals, or a metal and a non-metal. For example, steel is an alloy of iron and carbon. Concept insight: For answering this question, write the comnplete definition of alloys with all the key words - homogeneous mixture, two or more elements.
Chapter 3 - Metals and Non-metals Exercise 56 Solution 1. However, in case of iron frying pan, grease and paint cannot be applied because when the pan will be heated and washed again and again, the coating of grease and paint would get destroyed. Concept insight: The key to this answer is to find which oxide has a high melting point and is also soluble in water.
Concept insight: Food cans are coated with tin and not with zinc because zinc is more reactive than tin. Similarly, we can use the battery, bulb, wires, and a switch to set up a circuit with the sample. If the sample conducts electricity, then it is a metal otherwise a non-metal.
These tests are based on physical properties and no chemical reactions are involved in these tests. Concept insight: A hammer can be used to test whether the element is malleable or not.
If it can be beaten into thin sheets, it is malelable. Most metals are malleable. Similarly, most metals are good conductors of electricity. So, a battery, bulb, wires, and a switch can be used to set up a circuit. Those oxides that behave as both acidic and basic oxides are called amphoteric oxides. They react with both acids as well as bases to form salts and water. Examples: aluminium oxide Al 2 O 3 , zinc oxide ZnO Concept insight: In this answer, you should write the definition of amphoteric oxide.
Remember that it shows the properties of both acidic and basic oxides. Metals that are more reactive than hydrogen displace it from dilute acids. For example: sodium and potassium. Metals that are less reactive than hydrogen do not displace it. For example: copper and silver. Concept insight: For this question, remember that a displacement reation will take place if a more reactive element displaces a less reactive element from its salt solution.
Chapter 3 - Metals and Non-metals Exercise 57 Solution 8. So, Anode will be impure. Also, since sulphur is a non- metal it will turn wet blue litmus paper red. Two ways to prevent the rusting of iron are: i Oiling, greasing, or painting: By applying oil, grease, or paint, the surface becomes water proof and the moisture and oxygen present in the air cannot come into direct contact with iron.
Hence, rusting is prevented. Concept insight: For answering this question, mention any two ways for prevention of rusting. Answer Non-metals combine with oxygen to form acidic or neutral oxides. Also, they are very less reactive and do not corrode easily.
Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture. This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide. This oxide layer is very stable and prevents further reaction of aluminium with oxygen.
Also, it is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils. First read the Class 10th Chemistry Chapter 5 Ncert Solutions Company question carefully, think about the answer and then explain. Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. The citric acid present in the lemon or tamarind neutralises the basis copper carbonate and dissolves the layer.
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