You are provided with a container made up of aluminium. You are also provided with solutions of dil HCl, dil HNO3, ZnCl2 and H2O. Out of these solution which solution, can be kept in the aluminium container? Name the type of reaction taking place. (2013)
(i) Dilute HCl cannot be kept in aluminium container because aluminium metal reacts rapidly with dil HCl to form aluminium chloride and hydrogen gas.
(ii) Dil HNO3 cannot be kept in aluminium container because aluminium metal reacts with dil HNO3 to form aluminium nitrate and the hydrogen liberated in this reaction is oxidised to water and nitric acid itself is reduced to any of the oxides of nitrogen. (Displacement reaction)
(iii) ZnCl2 solution also cannot be kept in aluminium container because Al is more reactive than Zn, therefore more reactive Al displace less reactive Zn from its solution (ZnCl2).
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