Class 10 Science Metals and Non Metals Important Problem and solutions
In this page we have Class 10 Science Metals and Non Metals Important Problem and solutions . Hope you like them and do not forget to like , social shar
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Question 1 Nonmetals combine with oxygen to form_________ oxides. Question 2 Sulphur molecule is _____ Question 3 Best conductor of electricity is_________ Question 4 A list of common metals arranged in order of their decreasing reactivity is known as an ________. Question 5 When concentrated H2SO4 comes in contact with sugar, it becomes black due to________ Question 6 The extraction of metals from ores and then refining them for use is known as _____. Question 7 The surface of some metals, such as iron, is corroded when they are exposed to moist air for a long period of time. This phenomenon is known as _____. Question 8 The best conductors of electricity are copper and ______ . Question 9 SO2 reacts with Cl2 in the presence of sun light to form__________ Question 10 An alloy of any metals with mercury is called _____ and the electrical conductivity of an alloy is _______ than that of pure metals. Question 11 Stainless steel contains ________, _________ and ______. Question 12 A process employed for the concentration of sulphide ore is _____ Question 13 An alloy containing copper (80%), zinc (10%) and tin (10%) is called_______ Question 14 The method of removing volatile matter from carbonate ores is known as _______. Question 15 Bronze is an alloy of copper and _________ . Question 16 ________processes is used in the extractive metallurgy of magnesium. Question 17 The main ore of copper is ________ . Question 18 The reagent is used in Baeer’s process________ Question 19 In electrolytic refining, impure metal is used as ________ . Question 20 A basic lining is given to a furnace by using__________ Solution
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11.Iron, chromium, carbon
16.Fused salt electrolysis
Question 1 Sodium metal reacts with both hot water and steam. Question 2 Bromine is a liquid nonmetal at room temperature. Question 3 Metals can form positive ions by losing electrons to non- metals. Question 4 Different metals have same reactivity with water and dilute acids. Question 5 A more reactive metal displaces a less reactive metal from its salt solution. Question 6 Metals have low melting and boiling points. Question 7 Nonmetal reacts with hydrogen to form ionic hydride. Question 8 Aluminum is the most abundant metal in the earth’s crust. Question 9 The presence of carbon in pig iron makes it very soft and malleable. Question 10 Silver is the best conductor of electricity.