Question 1. You must have noticed that copper does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. They act as acids when they dissolve in water, and this is why indicator paper must be moist in order to detect whether a non-metal oxide gas is acidic. Short Answer Type Questions. Science Class 8 - Chapter 4 - Materials: Metals and Non -Metals - NCERT Exercise Solution ( Question-Answer) Provided here. Metals react with acids to produce metal salts and hydrogen gas, generally non- metals do not react with acids; Some of the metals react with bases to produce hydrogen gas. Table 4.4 : Metals and Non-metals in Acids and Bases S.No. Reaction with Oxygen: Metals form oxides which are basic in nature. Non-metals: Generally, non-metals do not react with acids. (F) (ii) Sodium is a very reactive metal. Download free PDF of best NCERT Solutions , Class 8, Science, CBSE-Materials-metals and non-metals . ( ) (d) Coal can be drawn into wires. The first part of the chapter, Materials: Metals and Non -metals discusses the physical properties of metals and non-metals in a detailed manner. More reactive metals can displace less reactive metals from their salt solutions. Mark ‘T’ if the statement is true and ‘F’ if it is false. They cannot displace hydrogen to form a bond with a non-metal anion. Sodium is a very reactive metal. Answer: a → F, b → T, c → F, d → F. Question 5: Some properties are listed in the following Table. 5. Copper displaces zinc from zinc sulphate solution. Non metals do not react with acid. Acids and Bases React with Metals. Non metals are poor conductors of heat and electricity. Examples- carbon dioxide, diphosphorus pentoxide and nitrogen dioxide. Match the substances given in Column A with their uses given in Column B. While magnesium, zinc, iron, tin and lead does not react vigorously with acids. You must have found that non-metals generally do not react with acids but metals react with acids and produce hydrogen gas that burns with a ‘pop’ sound. Q 8. Reaction with Bases. (a) Generally, non-metals react with acids (b) Sodium is a very reactive metal (c) Copper displaces zinc from zinc sulphate solution (d) Coal can be drawn into thin wires . F. 2. However, some metals like Al, Pb, Zn react with strong bases like NaOH to form complex salts and hydrogen gas. Soln: (a) Phosphorus is a very reactive non-metal. (a) Generally, non-metals react with acids. Activity. C. Reactions with Acids. Generally, non-metals do not react with water though they may be very reactive in air. (F) (d) Coal can be drawn into wires. The chapter starts with a discussion on appearances and hardness of different materials used commonly. ( ) (c) Copper displaces zinc from zinc sulphate solution. 2. Mg + HCl → MgCl 2 + H 2 Fe + H 2 SO 4 → FeSO 4 + H 2. F. 4. It catches fire if exposed to air. For example, phosphorus is a very reactive non-metal. ( ) Answer: 1. 8. Sol. (b) Sodium is a very reactive metal. Non-metals generally do not react with acids. Oxides of aluminium (Al 2 O 3), zinc (ZnO), tin (SnO) and iron (Fe 2 O 3) are amphoteric. Coal can be drawn into wires. Science NCERT Grade 8, Chapter 4, Materials: Metals and Non-Metals lay emphasis on fundamentals of metals and non-metals. Non metals have low density. You can also get free sample papers, Notes, Important Questions. (a) Generally, non-metals react with acids. ( ) 3. Coal can be drawn into wires. Non – metals are electronegative and are unable to break the bond between H and O in water. Metals which fall below hydrogen in the reactivity series does not react with dilute acids. Q4. This video is unavailable. (a) H 2 SO 4 (b) HCl (c) HNO 3 (d) All of these 8. Reaction with W ater Let us see how metals and non-metals react with water . Aim: To show that hydrogen is produced when magnesium reacts with dilute sulphuric acid Materials needed: Magnesium ribbon, dilute sulphuric acid, test tube, dropper, and a matchstick Method: Take a piece of magnesium ribbon in the test tube. Distinguish between metals and non-metals … Such non-metals are stored in water. ( ) (b) Sodium is a very reactive metal. Displacement reactions. ( ) (d) Coal can be drawn into wires. Sodium is a very reactive metal. Distinguish between metals and non-metals on the basis of these properties. ( ) 4. Generally metals react with acids to give salt and hydrogen gas. In the following table some substances are given in column I. TABLE 4 3 Electrical Conductivity of Materials. Metals have high density. (a) Generally, non-metals react with acids. Watch Queue Queue. Metal and non-metal both react with oxygen (air), water and acids. (d) Metals react with acids to produce __hydrogen__ gas. Reactions with Bases . 1] Metals are malleable and ductile.Non-metals do not have such properties. Distinguish between metals and non-metals on the basis of these properties. (a) Generally, non-metals react with acids. Generally metals react with acids to give salt and hydrogen gas. 2] Metals are good conductors of heat but non-metals are poor conductors. Ans: (a) False (b) True (c) False (d) False . Metals and Non-metals Class 10 MCQs Questions with Answers. Generally, non-metals react with acids. Generally, non-metals do not react with water though they may be very reactive in air. MP Board Class 8th Science Materials: Metals and Non-Metals NCERT Intext and Projects Activities. (d) Metals react with acids to produce _____ gas. They are generally formed by non-metals. The composition of aqua-regia is A. Dil.HCl : Conc. Which of the following metals is an exception and can be cut with a knife? For example, phosphorus is a very reactive non-metal. Let us see how metals and non-metals behave with acids. You can refer to NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. As discussed previously, metals that are more active than acids can undergo a single displacement reaction.For example, zinc metal reacts with hydrochloric acid producing zinc chloride and hydrogen gas. Acids react with most metals to form a salt and hydrogen gas. 4. F. Question 7. Watch Queue Queue Metals react with sodium hydroxide to produce hydrogen gas. The acids react with metals to give hydrogen which would spoil the food and makes it unfit to use. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)? Mark ‘T’ if the statement is true and ‘F’ if it is false. Metal + Sodium hydroxide → Hydrogen. Metals are generally hard. (d) Metals react with acids to produce hydrogen gas. 7. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. (b) Metals are good conductors of heat and electricity. Recall the name of some of the laboratory acids and bases you have read in Class VII. (F) Q.5 Some properties are listed in the following Table. produce acids. HNO 3 3 : 1 (b) Conc.HCl : Dil. (c) Copper displaces zinc from zinc sulphate solution. Reaction with bases : Most of the metals do not react with bases. Q.8. (c) Iron is more reactive than copper. Metals are good conductors of heat and electricity. C. Reactions with Acids . Generally, non-metals react with acids. Such non-metals are stored in water. T. 3. 4) Mark ‘T’ if the statement is true and ‘F’ if it is false. Some properties are listed in the following Table. … Non-metals do not react with acids except sulphur which react with hot, concentrated acid. Non-metals are themselves acceptors of electrons so there is no way they can donate electrons to the hydrogen ion of the acid. ( ) (b) Sodium is a very reactive metal. A. H₂SO₄ B. HCl C. HNO₃ D. All the these . Answer: (a) … 3] On burning, metals react with oxygen to produce metal oxides and hydrogen gas. (F) (b) Sodium is a very reactive metal. Which of the given acids does not give hydrogen gas on reacting with metals (except Mn and Mg)? Note down their names in Table 4.4. They react with acids as well as with bases. Which of the following metals is in the liquid state at room temperature? They cannot displace less reactive metals from their salt solution. (d) Metals react with acids to produce __hydrogen__ gas. ( ) (c) Copper displaces zinc from zinc sulphate solution. Generally, oxides of non-metals are acidic in nature. When a metal displaces another metal from a compound; this is called displacement reaction. Non-metals do not react with water (or steam) to evolve Hydrogen gas. ( ) Answer: (i) Generally, non-metals react with acids. HNO 3 3 : 1 (c) Conc.HCl : Conc.HNO 3 3 : 1 (d) Dil.HCl : Dil.HNO 3 3 : 1 9. Generally, the non-metals do not react with acids. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. 4. Reaction of Metal With Other Metal Salts Non-metals’ reaction with sodium hydroxide is much complex. All NCERT textbook questions have been solved by our expert teachers. The composition of aqua-regia is (a) Dil.HCl : Conc. Question 1. TABLE 4.2 Malleability of Materials. (T) (c) Copper displaces zinc from zinc sulphate solution. It catches fire if exposed to air. Copper displaces zinc from zinc sulphate solution. The non – metals cannot reduce hydrogen by donating electrons. (d) Coal can be drawn into wires. This is because when a substance reacts with acids, it provides electrons to the H+ ions produced by the acids. Like Graphite. HNO₃ = 3 : … ( ) 2. MP Board Class 8th Science Materials: Metals and Non-Metals NCERT Additional Important Questions. 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