(i) Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores. Sometimes, some highly reactive metals are used as reducing agents.Įxample: 3MnO 2 + 4Al → 3Mn + 2Al 2O 3 + heatĮxample: Na, Mg and Ca are obtained by electrolysis of their molten chlorides. (ii) Oxides of moderately reactive metalsĮxplain by giving a suitable example. Which method will you use to reduce the following?
#Reactivity series worksheet with answers pdf cracked
(d) Use: To join railway tracks or cracked machine parts. (d) Mention the most common use of this reaction. (c) Represent this reaction in the form of a balanced chemical equation. (b) After completion of this reaction, a metal is obtained in the molten state. (a) Name the metal used in this reaction. In a thermite reaction, a compound of iron reacts with a metal. Zinc oxide is then reduced to zinc metal by heating it with carbon. Metal X is Zinc: The sulphide ore is first heated strongly in supply of oxygen and changed into its oxide. How will you convert this sulphide ore into the metal? Explain with equations. It is used in the galvanisation of iron articles. Metal X is found in nature as its sulphide XS. Reduction of iron oxide to iron by aluminium is called thermite reaction. What is a thermite reaction? (1 Marks)Īns. Solution. Metals such as gold and silver are found as native metals. Which of the following metals exist in their native state in nature? (1 Marks) (b) State two ways to prevent the rusting of iron. (a) List in a tabular form any three chemical properties on the basis of which metals and non-metals are differentiated. (iii) Aluminium is covered with a strong protective layer of oxide which protects the metal from further corrosion. (ii) Like metals, hydrogen can lose an electron to form positive H + ion. (i) Non-metals are electron acceptors they cannot supply electrons so as to convert H + ion to H 2(g). (iii) Aluminium is more reactive than iron, yet its corrosion is less than that of iron.Īns. (ii) Hydrogen is not a metal, yet it is placed in the activity series of metals. (i) Non-metals cannot displace hydrogen from the acids. State reason for the following : (3 Marks) ZnO reacts with sodium hydroxide (base) to form sodium zincate (salt) and water thus, acting as acidic oxide. ZnO reacts with hydrochloric acid (acid) to form zinc chloride (salt) and water thus acting as basic oxide. Amphoteric oxides react with acids as well as base to form salt and water. Examples are aluminium oxide and zinc oxide. Amphoteric oxides: Metal oxides showing both acidic and basic nature.ĭetailed Answer: Oxides of metals which have both acidic as well as basic behaviour are known as amphoteric oxides. Write balanced chemical equations to justify your answer. What are amphoteric oxides? Give an example. Name one metal and non-metal which exists in liquid state at room temperature? (1 Marks)Īns.
0 kommentar(er)
