Generally, non-metals react with acids. TABLE 4.2 Malleability of Materials. (a) Generally, non-metals react with acids. Reaction with Bases. For example, phosphorus is a very reactive non-metal. Such non-metals are stored in water. They cannot displace hydrogen to form a bond with a non-metal anion. (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 . ( ) (c) Copper displaces zinc from zinc sulphate solution. F. 4. Examples- carbon dioxide, diphosphorus pentoxide and nitrogen dioxide. (c) Copper displaces zinc from zinc sulphate solution. The composition of aqua-regia is A. Dil.HCl : Conc. Non-metals are themselves acceptors of electrons so there is no way they can donate electrons to the hydrogen ion of the acid. 8. A. H₂SO₄ B. HCl C. HNO₃ D. All the these . Science Class 8 - Chapter 4 - Materials: Metals and Non -Metals - NCERT Exercise Solution ( Question-Answer) Provided here. Metals and Non-metals Class 10 MCQs Questions with Answers. The non – metals cannot reduce hydrogen by donating electrons. Question 1. ( ) (b) Sodium is a very reactive metal. Coal can be drawn into wires. ( ) Answer: (i) Generally, non-metals react with acids. Watch Queue Queue. Which of the following metals is in the liquid state at room temperature? 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. Science NCERT Grade 8, Chapter 4, Materials: Metals and Non-Metals lay emphasis on fundamentals of metals and non-metals. Such non-metals are stored in water. 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 . 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. Oxides of aluminium (Al 2 O 3), zinc (ZnO), tin (SnO) and iron (Fe 2 O 3) are amphoteric. (F) (ii) Sodium is a very reactive metal. Non – metals are electronegative and are unable to break the bond between H and O in water. Which of the following metals is an exception and can be cut with a knife? Reaction with bases : Most of the metals do not react with bases. Metals have high density. MP Board Class 8th Science Materials: Metals and Non-Metals NCERT Intext and Projects Activities. ( ) 3. When a metal displaces another metal from a compound; this is called displacement reaction. 4. Metals react with sodium hydroxide to produce hydrogen gas. Non-metals’ reaction with sodium hydroxide is much complex. Mg + HCl → MgCl 2 + H 2 Fe + H 2 SO 4 → FeSO 4 + H 2. The ability of metals to be drawn into thin wires is known as To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. TABLE 4 3 Electrical Conductivity of Materials. You can also get free sample papers, Notes, Important Questions. (d) Metals react with acids to produce _____ gas. Generally metals react with acids to give salt and hydrogen gas. Non-metals do not react with acids except sulphur which react with hot, concentrated acid. ( ) (b) Sodium is a very reactive metal. ( ) (d) Coal can be drawn into wires. 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. The acids react with aluminium to release hydrogen which would spoil the food and render it unfit for use. Generally, non-metals react with acids. 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