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Question:

What gas is produced?

Aluminum Foil and Hydrogen Chloride? and Why is it produced?

Answer:

Aluminium chloride + HydrogenThis reaction is extremely exothermicIt is actually not blackif it is, the reaction is still onnot endedBut you can't prepare anhydrous aluminium chloride in this methodAnhydrous aluminium chloride fumes in moist air and reacts with water vigorouslyPure anhydrous aluminium chloride is colorless and if it is bit impure, it is in yellow in colorAnhydrous aluminium chloride can be prepared by passing dry chlorine gas over heated aluminium.

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