{"id":12983,"date":"2020-10-12T11:50:17","date_gmt":"2020-10-12T06:20:17","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=12983"},"modified":"2022-03-02T11:17:52","modified_gmt":"2022-03-02T05:47:52","slug":"materials-metals-and-non-metals-class-8-extra-questions","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/materials-metals-and-non-metals-class-8-extra-questions\/","title":{"rendered":"Materials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4"},"content":{"rendered":"

Materials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science<\/a> Question bank on a regular basis.<\/p>\n

Class 8 Science Chapter 4 Extra Questions and Answers Materials: Metals and Non-Metals<\/h2>\n

Extra Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals with Answers\u00a0<\/strong><\/p>\n

Materials: Metals and Non-Metals Class 8 Extra Questions Very Short Answer Type<\/h3>\n

Question 1.
\nDo non-metals produce ringing sound?
\nAnswer:
\nNo, non-metals do not produce the ringing sound. It is a property of metals only.<\/p>\n

\"Materials:<\/p>\n

Question 2.
\nList the characteristic properties of metals.
\nAnswer:
\nThe metals have the following properties:
\n(a) Hardness,
\n(b) lustre,
\n(c) malleability
\n(d) ductility,
\n(e) sonority, and
\n(f) good conductivity of heat and electricity.<\/p>\n

Question 3.
\nName some metals.
\nAnswer:
\nIron, copper, gold, aluminium, magnesium, etc.<\/p>\n

Question 4.
\nGive some examples of non-metals.
\nAnswer:
\nSulphur, carbon, oxygen, phosphorus, calcium, etc.<\/p>\n

Question 5.
\nName two metals which can be cut with knife.
\nAnswer:
\nSodium and potassium are two metals which are soft and can be cut with a knife.<\/p>\n

Question 6.
\nName a metal which is found in liquid state at room temperature.
\nAnswer:
\nMercury.<\/p>\n

Question 7.
\nWrite the equation of rusting of iron.
\nAnswer:
\n3Fe + 2H2<\/sub>0 + 02<\/sub> \u279d Fe3<\/sub>O4<\/sub> + 2H2<\/sub><\/p>\n

Question 8.
\nIf the red litmus placed in a solution turns blue, the solution is called ________ hydroxides.
\nAnswer:
\nBasic.<\/p>\n

Question 9.
\nIf the blue litmus paper turns red, the solution is called ________ hydroxides.
\nAnswer:
\nAcidic.<\/p>\n

\"Materials:<\/p>\n

Question 10.
\nWhen sulphur reacts in air (O2<\/sub>), what is the product formed.
\nAnswer:
\nIt is sulphur dioxide (SO2<\/sub>).<\/p>\n

Question 11.
\nWhat is formed when sulphur dioxide is dissolved in water ? Also write the equation.
\nAnswer:
\nSulphurous acid is formed.
\nSO2<\/sub> + H2<\/sub>O \u279d H2<\/sub>SO3<\/sub>
\n(Sulphurous acid)<\/p>\n

Question 12.
\nWhat happens when a blue litmus paper is treated with an acid ?
\nAnswer:
\nThe blue litmus paper turns red.<\/p>\n

Question 13.
\nName the non-metals in the following acids:
\nSulphuric acid (H2<\/sub>SO4<\/sub>), Hydrochloric acid (HC1<\/sub>) and Nitric acid (HN03<\/sub>).
\nAnswer:
\nSulphur, chlorine and nitrogen respectively.<\/p>\n

Question 14.
\nWhat happens when a small piece of sodium metal is placed in water?
\nAnswer:
\nThe metal piece starts moving in water with a hissing sound and then it catches fire.<\/p>\n

Materials: Metals and Non-Metals Class 8 Extra Questions Short Answer Type 1<\/h3>\n

Question 1.
\nWhy are metals used in making’ machinery?
\nAnswer:
\nMetals are very hard, can withstand very high temperature and are strong as well as lustrous. That is why they are used “in making various machinery.<\/p>\n

Question 2.
\nDefine element.
\nAnswer:
\nThe substances made up of only one type of atoms are called element. Sulphur, iron, gold, calcium, hydrogen, etc. are elements. There are about 92 elements. Most of the elements are metals.<\/p>\n

Question 3.
\nWhat is an atom?
\nAnswer:
\nAn atom is the smallest unit of an element. The atom of an element remains unaffected by any physical change in the element.<\/p>\n

\"Materials:<\/p>\n

Question 4.
\nDescribe how metallic and non- metallic oxides are formed.
\nAnswer:
\nOn burning, metals react with oxygen to produce metal oxides which are basic in nature. Non-metals react with oxygen to produce non-metallic oxides which are acidic in nature.<\/p>\n

Question 5.
\nHow can metals be distinguished from non-metals?
\nAnswer:
\nMetals can be distinguished from non-metals on the basis of their physical and chemical properties.<\/p>\n

Question 6.
\nDefine malleability of a metallic substance.
\nAnswer:
\nThe property of metals by which they can be beaten into thin sheets, is called malleability. This is the characteristic property of metals.<\/p>\n

Question 7.
\nWhy is sodium stored in kerosene?
\nAnswer:
\nSodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in the reaction. Therefore it is stored in kerosene to avoid its contact with air and water.<\/p>\n

Materials: Metals and Non-Metals Class 8 Extra Questions Short Answer Type 2<\/h3>\n

Question 1.
\nExplain the construction of a water filter with materials available at home.
\nAnswer:
\n(a) Cut off the bottom of a plastic bottle and place the bottle upside down into the vase or tall drinking glass.
\n(b) Place cotton balls, cloth, or a coffee filter inside the bottle as the first layer. Add an inch of activated charcoal as the second layer. Over the charcoal, add about two inches of small stones as the third layer and add about three to four inches of clean sand on top of the gravel.
\n(c) Add gravel to the bottle as the final layer. Leave about a half-inch of space from the top of the upside-down bottle.
\n(d) Pour the glass of muddy water on top of the homemade water filter and watch the water drip clean into the glass below.<\/p>\n

\"Materials:<\/p>\n

Question 2.
\nHow metal reacts with
\n(a) Oxygen
\n(b) Water and
\n(c) Acids
\nAnswer:
\n(a) Metals react with oxygen and form their oxides.
\nMagnesium (Mg) + Oxygen (O2<\/sub>) \u279d Magnesium Oxide (MgO)
\nSodium (Na) + Oxygen (O2<\/sub>) \u279d Sodium oxide (Na2<\/sub>O)<\/p>\n

(b) Metals react with water differently. Metals like sodium reacts with water vigorously and a lot of heat is produced. Whereas iron reacts with water slowly.
\nSodium (Na) + Water (H20) \u279d Sodium hydroxide (NaOH) + Hydrogen gas (H2<\/sub>)<\/p>\n

(c) Metals react with dilute acids and produce hydrogen gas that burns with a \u2018pop\u2019 sound.
\nZinc (Zn) + Hydrochloric acid (HCl) \u279d Sodium chloride (NaCl) + Hydrogen gas (H2<\/sub>)<\/p>\n

Question 3.
\n(a) What is a displacement reaction? Give an example for it.
\n(b) Which gas is released when acid reacts with a metal?
\nAnswer:
\n(a) The chemical reaction in which a more reactive metal displaces\/replaces a less reactive metal from its salt solution is called a displacement reaction. But a less reactive metal cannot replace a more reactive metal.
\n\"Materials
\n(b) Hydrogen gas is released when acid reacts with a metal.
\nSodium (Na) + Water (H2<\/sub>O) \u279d Sodium Hydroxide (NaOH) + Hydrogen gas (H2<\/sub>)<\/p>\n

Materials: Metals and Non-Metals Class 8 Extra Questions Long Answer Type<\/h3>\n

Question 1.
\nWrite down three uses of metals and two uses of non-metals..
\nAnswer:
\nUses of metals :
\n(a) Metals are used in making machinery, automobiles, aeroplanes, trains, satellites and industrial gadgets, etc.
\n(b) Metals are used in making cooking utensils, water boilers, etc.
\n(c) Metals are used in making decorative arts, jewellery and coins.
\n(d) Aluminium foils are used for packaging medicines, chocolates, decorating sweets, wrapping food, etc.<\/p>\n

Uses of non-metals :
\n(a) Non-metal essential for our life which all living beings inhale during breathing.
\n(b) Non-metals used in fertilisers to enhance the growth of plants.
\n(c) Non-metal used in water purification process.
\n(d) Non-metals used in crackers.<\/p>\n

Hope the knowledge provided regarding the Materials: Metals and Non-Metals Class 8 Extra Questions and Answers has helped you to the possible extent. For more info feel free to reach us and we will guide you at the earliest possibility. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly.<\/p>\n","protected":false},"excerpt":{"rendered":"

Materials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 8 Science Question bank on a regular basis. Class 8 Science Chapter 4 …<\/p>\n

Materials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","spay_email":""},"categories":[7],"tags":[],"yoast_head":"\nMaterials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4 - MCQ Questions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mcq-questions.com\/materials-metals-and-non-metals-class-8-extra-questions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Materials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4 - MCQ Questions\" \/>\n<meta property=\"og:description\" content=\"Materials: Metals and Non-Metals Class 8 Extra Questions and Answers Science Chapter 4 PDF are solved by experts and will guide students in the right direction. 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