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InterviewSolution
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You are provided with a container made up of aluminium. You are also provided with solutions of dil HCl, dil `HNO_(3), ZnCl_(2)` and `H_(2)O`. Out of these solutions which solution, can bekept in the aluminium container ? Name the type of reaction taking place. |
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Answer» (i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and liberating hydrogen gas. `2Al(s) +6HCl(dil) rarrunderset("(Displacement reaction)")(2AlCl_(3)(aq))+3H_(2)(g)` (ii) When dilute `HNO_(3)` is kept in aluminium container, it forms a protective layer of aluminium oxide on it which makes it passive towards action with acid and therefore, it can be kept in Aluminium container. `2Al(s)+6NO_(3) rarr underset("(Displacement reaction)")(Al_(2)O_(3))+6NO_(2)+3H_(2)O` (iii) `ZnCl_(2)` solution also cannot be kept in aluminium container because Al is more reactive then Zn, therefore more reactive Al displaces less reactive Zn from its solution `( ZnCl_(2))` . `2Al(s)+3ZnCl_(2)(aq) rarr underset("(Displacement reaction )")(2AlCl_(3))+3Zn` (iv) Aluminium does not react with `H_(2)O` . So, can be kept in aluminium container. |
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