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  4. Aluminium on reaction with aqueous KOH solution gives

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Q. Aluminium on reaction with aqueous KOH solution gives

The p-Block Elements

Solution:

$2 Al +2 KOH +2 H _2 O \longrightarrow 2 KAlO _2+3 H _2$
This is called Uyeno's method for the preparation of pure hydrogen.