(F) (d) Coal can be drawn into wires. Reaction with bases : Most of the metals do not react with bases. While magnesium, zinc, iron, tin and lead does not react vigorously with acids. (a) Generally, non-metals react with acids. The composition of aqua-regia is A. Dil.HCl : Conc. The acids react with aluminium to release hydrogen which would spoil the food and render it unfit for use. Science NCERT Grade 8, Chapter 4, Materials: Metals and Non-Metals lay emphasis on fundamentals of metals and non-metals. More reactive metals can displace less reactive metals from their salt solutions. Watch Queue Queue. 1] Metals are malleable and ductile.Non-metals do not have such properties. (d) Metals react with acids to produce _____ gas. Examples- carbon dioxide, diphosphorus pentoxide and nitrogen dioxide. Generally, non-metals do not react with bases. The first part of the chapter, Materials: Metals and Non -metals discusses the physical properties of metals and non-metals in a detailed manner. Non metals are poor conductors of heat and electricity. 3] On burning, metals react with oxygen to produce metal oxides and hydrogen gas. This video is unavailable. The non – metals cannot reduce hydrogen by donating electrons. Q 8. 2. A. H₂SO₄ B. HCl C. HNO₃ D. All the these . Generally, non-metals react with acids. Metals and Non-metals Class 10 MCQs Questions with Answers. Copper displaces zinc from zinc sulphate solution. Which of the following metals is in the liquid state at room temperature? ( ) 2. Soln: (a) Phosphorus is a very reactive non-metal. Note down their names in Table 4.4. 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 4.2 Malleability of Materials. Sodium is a very reactive metal. (a) Generally, non-metals react with acids. ( ) (d) Coal can be drawn into wires. Non-metals do not react with water (or steam) to evolve Hydrogen gas. (a) Generally, non-metals react with acids. Non-metals’ reaction with sodium hydroxide is much complex. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. (d) Metals react with acids to produce __hydrogen__ gas. 8. (c) Copper displaces zinc from zinc sulphate solution. Match the substances given in Column A with their uses given in Column B. Coal can be drawn into wires. (F) Q.5 Some properties are listed in the following Table. Non metals do not react with acid. Non – metals are electronegative and are unable to break the bond between H and O in water. F. Question 7. Let us see how metals and non-metals behave with acids. Reactions with Bases . (c) Iron is more reactive than copper. Generally, non-metals react with acids. Download free PDF of best NCERT Solutions , Class 8, Science, CBSE-Materials-metals and non-metals . Which of the following metals is an exception and can be cut with a knife? Ans: (a) False (b) True (c) False (d) False . For example, phosphorus is a very reactive non-metal. MP Board Class 8th Science Materials: Metals and Non-Metals NCERT Additional Important Questions. Recall the name of some of the laboratory acids and bases you have read in Class VII. ( ) (b) Sodium is a very reactive metal. Sol. Displacement reactions. Mark ‘T’ if the statement is true and ‘F’ if it is false. Metals react with sodium hydroxide to produce hydrogen gas. ( ) (c) Copper displaces zinc from zinc sulphate solution. Q.8. Answer: a → F, b → T, c → F, d → F. Question 5: Some properties are listed in the following Table. ( ) 3. C. Reactions with Acids. When a metal displaces another metal from a compound; this is called displacement reaction. Mark ‘T’ if the statement is true and ‘F’ if it is false. They react with acids as well as with bases. (F) (ii) Sodium is a very reactive metal. Distinguish between metals and non-metals on the basis of these properties. (T) (c) Copper displaces zinc from zinc sulphate solution. 7. ( ) (d) Coal can be drawn into wires. The composition of aqua-regia is (a) Dil.HCl : Conc. (b) Metals are good conductors of heat and electricity. They are generally formed by non-metals. Activity 4.7 (To be demonstrated by the teacher. Answer: (a) … This is because when a substance reacts with acids, it provides electrons to the H+ ions produced by the acids. Such non-metals are stored in water. Reaction with Bases. They cannot displace less reactive metals from their salt solution. You can also get free sample papers, Notes, Important Questions. (F) (b) Sodium is a very reactive metal. ( ) Answer: 1. C. Reactions with Acids . (d) Coal can be drawn into wires. 2] Metals are good conductors of heat but non-metals are poor conductors. Non-metals do not react with acids except sulphur which react with hot, concentrated acid. Metals are good conductors of heat and electricity. The acids react with metals to give hydrogen which would spoil the food and makes it unfit to use. Generally, non-metals do not react with water though they may be very reactive in air. Reaction of Metal With Other Metal Salts Oxides of aluminium (Al 2 O 3), zinc (ZnO), tin (SnO) and iron (Fe 2 O 3) are amphoteric. produce acids. Copper displaces zinc from zinc sulphate solution. Distinguish between metals and non-metals on the basis of these properties. HNO 3 3 : 1 (c) Conc.HCl : Conc.HNO 3 3 : 1 (d) Dil.HCl : Dil.HNO 3 3 : 1 9. Non-metals: Generally, non-metals do not react with acids. Generally, oxides of non-metals are acidic in nature. 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. Like Graphite. The ability of metals to be drawn into thin wires is known as 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. Such non-metals are stored in water. It catches fire if exposed to air. MP Board Class 8th Science Materials: Metals and Non-Metals NCERT Intext and Projects Activities. Identify the metal or non-metal present in them which forms oxides with oxygen. 4. T. 3. 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. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)? (b) Sodium is a very reactive metal. For example, phosphorus is a very reactive non-metal. Question 1. Non metals do not react with acids usually a metal reacts with acid to produce hydrogen gas while this is not observed with non metals, this is because metals are electro-positive . However, some metals like Al, Pb, Zn react with strong bases like NaOH to form complex salts and hy­drogen gas. (a) H 2 SO 4 (b) HCl (c) HNO 3 (d) All of these 8. Generally metals react with acids to give salt and hydrogen gas. Non-metals are themselves acceptors of electrons so there is no way they can donate electrons to the hydrogen ion of the acid. Generally metals react with acids to give salt and hydrogen gas. Table 4.4 : Metals and Non-metals in Acids and Bases S.No. 4) Mark ‘T’ if the statement is true and ‘F’ if it is false. ( ) Answer: (i) Generally, non-metals react with acids. ( ) (b) Sodium is a very reactive metal. F. 2. Generally, the non-metals do not react with acids. Reaction with W ater Let us see how metals and non-metals react with water . The chapter starts with a discussion on appearances and hardness of different materials used commonly. Which of the given acids does not give hydrogen gas on reacting with metals (except Mn and Mg)? They cannot displace hydrogen to form a bond with a non-metal anion. Distinguish between metals and non-metals … All NCERT textbook questions have been solved by our expert teachers. F. 4. ( ) (c) Copper displaces zinc from zinc sulphate solution. Non-metals generally do not react with acids. Science Class 8 - Chapter 4 - Materials: Metals and Non -Metals - NCERT Exercise Solution ( Question-Answer) Provided here. You must have noticed that copper does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. Generally, non-metals do not react with water though they may be very reactive in air. Let us see how metals and non-metals behave with acids. (a) Generally, non-metals react with acids. Some properties are listed in the following Table. 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. It catches fire if exposed to air. A. In the following table some substances are given in column I. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. 4. Metals have high density. Sodium is a very reactive metal. Watch Queue Queue (a) iron (b) sodium (c) gold (d) magnesium; Metals are generally solid. 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. (d) Metals react with acids to produce hydrogen gas. 5. (a) Generally, non-metals react with acids. HNO₃ = 3 : … Activity. (d) Metals react with acids to produce __hydrogen__ gas. Coal can be drawn into wires. HNO 3 3 : 1 (b) Conc.HCl : Dil. Reaction with Oxygen: Metals form oxides which are basic in nature. (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 . Metal + Sodium hydroxide → Hydrogen. Mg + HCl → MgCl 2 + H 2 Fe + H 2 SO 4 → FeSO 4 + H 2. Metals which fall below hydrogen in the reactivity series does not react with dilute acids. Non metals have low density. TABLE 4 3 Electrical Conductivity of Materials. … Q4. Metal and non-metal both react with oxygen (air), water and acids. Metals are generally hard. Question 1. Acids and Bases React with Metals. Question 5: Some properties are listed in the following table. ( ) 4. Short Answer Type Questions. Acids react with most metals to form a salt and hydrogen gas. Between metals and non-metals NCERT Intext and Projects Activities a substance reacts with.! Bases like NaOH to form complex salts and hy­drogen gas much complex but it reacts sulphuric! 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