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Long Answer Type Questions: 1. (a) What are metalloids? Name two metalloids.(b) Classify the following elements in metals, non-metals and metalloids:Copper, Sulphur, Aluminum, Oxygen, Silicon, Nitrogen, Germanium, Mercury,Chlorine, Sodium.2. What happens when sulphur dioxide is dissolved in water? Write the equation for thereaction.HOTS:1 The metal reacts with dilute hydrochloric acid to form a gas Y. The metal X also reacts with sodium hydroxide solution (on heating ) to form the same gas Y. When a lighted matchstick is applied, this gas burns by producing a 'pop' sound.(a) Name two metals which could behave like X(b) Name the gas Y.2. An element reacts with oxygen to form an oxide. An aqueous solution of this oxide turns red litmus paper blue. Is the element a metal or a non-metal. Give reason foryour answer.3. Consider the following displacement reaction:(i) Copper sulphate + Iron ----> Iron sulphate +Copper (solution)(ii) Iron Sulphate + Zinc ----> Zinc sulphate + Iron(solution)On the basis of these two displacement reaction, find out which is the most reactivemetal and which is the least reactive metal out of copper iron and zinc. |
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Answer» 1.a) metalloids are those elements which shows the the properties of both metal and nonmetal.TWO metalloids are boron and siliconb) COPPER aluminium Mercury and sodium are metalssulphur oxygen CHLORINE and nitrogen are non metalssilicon and GERMANIUM are metalloids2. When Sulphur dioxide is added to water the water becomes acidic in nature.HOTS1.a) Two METALS that can be behave like X are sodium and magnesiumb) the gas Y is hydrogen3. most reactive metal is zincmoderate reactive metal is ironleast reactive metal is copper |
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