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Q.
In Lake test of $ A{{l}^{3+}} $ ion, there is formation of coloured floating-lake. It is due to
Rajasthan PMTRajasthan PMT 2003The p-Block Elements
Solution:
In Lake test of $Al ^{3+}$ ion, there is formation of coloured floating lake. It is due to the fact that $Al ( OH )_{3}$, a solid surface (suspension) absorbed litmus colour hence appears as "coloured floating lake."