Question

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Answer 1

see Al is so reactive that it reacts with the Oxygen present in the air and it forms an oxide layer on top of it so initially it wasn't reactive to the Hcl due to that oxide layer but later when the oxide layer get dissolved it reacts more vigorously than iron
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Answer 2

A general inference:

Metal + Acid → Salt + Hydrogen gas.

Fe (s) + HCl (aq)→ FeCl₂(aq)+H₂(g)

2Al + 6HCl(aq) → 2AlCl₃ + 3H₂(g)

Due to the presence of a oxide layer on the surface of Aluminium which hinders the rate of reaction initially but later bare Al reacts vigorously .So at first the acid consumes time to dissolve that layer.

-Hope it helps

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