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You are provided with two containers mad...

You are provided with two containers made up of copper and aluminium.
You are also provided with solutions of dilute HCl, dilute `HNO_(3),ZnCl_(2) and H_(2)O`. In which of the containers these solutions can be kept?

Text Solution

Verified by Experts

(i) Reaction of copper with :
(a) Dilute HCl: Copper does not react with dilute HCI. Therefore, it can be stored in copper container.
(b) Dilute `HNO_(3)` : Being a strong oxidizing agent, dilute `HNO_(3)` reacts with copper, so it cannot be stored in copper container.
(c ) `ZnCl_(2)` : Copper is less reactive than zinc so it does not react with `ZnCl_(2)` solution. Therefore, it can be stored in copper container.
(d) `H_(2)O` : Copper does not react with water. So, its container can store `H_(2)O` in it.
Thus, dil HCl, `ZnCl_(2)` solution and `H_(2)O` can be kept in copper vessel but dil, `HNO_(3)` cannot be kept in copper vessel.
(ii) Reactions of Aluminium with :
(a) Dilute HCl : Al reacts with dilute HCl, so it cannot be kept in aluminium container.
`2Al +6HCl to 2AlCl_(3) +3H_(2)`
(b) Dilute `HNO_(3)` : When dil. `HNO_(3)` is kept in Al container, it forms a protective layer of aluminium oxide on it which makes it passive towards action with acid, therefore, it can be kept in Al container.
(c ) `ZnCl_(2)` : Al is more reactive than zinc, so it cannot keep `ZnCl_(2)` solution in it.
`2Al +3ZnCl_(2) to 2AlCl_(3) +3Zn`
(d) `H_(2)O` : Al does not react with `H_(2)O`. So, its container can store `H_(2)O` in it.
`2Al(s) +3H_(2)O(g) to Al_(2)O_(3)(s) +3H_(2)(g)`
Thus, dil. `HNO_(3)` and `H_(2)O(l)` can be kept in aluminium vessel but dil HCl and `ZnCl_(2)` solution can not be kept in aluminium vessel.
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