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InterviewSolution
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Express the following chemical changes in the form of chemical equations and identify what types of chemical reactions they are. (a)A copper coin is placed in a solution of corrosive sublimate, mercuric chloride. The products obtained are cupric chloride and mercury. (b) A piece of (a) sulphur, (b) charcoal burns vigorously when dropped jn molten potassium nitrate, because potassium nitrate decomposes to form potassimn uitrite and oxygen and this oxygen helps to burn charcoal and sulphur giving out carbon dioxide and sulphurdioxide respectively. (c) Aqueous anmonium hydroxide solution is made to react with aqueous copper sulphate solution and a bluish white precipitate of cupric hydroxide and ammonium sulphate are formed. |
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Answer» Solution :(a) `Cu+HgCl_2toCuCl_2+Hg` Copper DISPLACES mercury from mercuric chloride and forms cupric chloride and mercury. This is a displacement reaction. (b)`2KNO_3to2KNO_2+O_2to(1)` `S+O_2toSO_2 to(2)` `C+O_2toCO_2to(3)` This first reaction repersents to FORM POTASSIUM nitrite and oxygen. Oxygen LIBERATED helps burn sulphur and charcoal to give sulphuric dioxide and carbon dioxide as given in the reactions (2) and (3). Reaction (1) is DECOMPOSITION reaction reactions. (c) `2NH_2OH+CuSO_4toCU(OH)_2downarrow+(NH_4)_2SO_4` |
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