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