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Expain the reaction of aluminium towards...

Expain the reaction of aluminium towards acid.

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Aluminium reacts with dil. HCI liberating hydrogen.
`2AI_((s)) + 6HCI _(aq) to 2AICI_(3(aq)) + 3H_(2(g)).` Aluminium becomes passive when treated with conc.
`HNO_(3)` due to the formation of a thin protective layer of oxide `(AI_(2)O_(3))` on its surface.
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