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The P-Block Elements

Question
CBSEENCH11007272

Give reasons:
Aluminium utensils should not be kept in water overnight.

Solution
This is because aluminium reacts with H2O and dissolved O2 to form a thin film of aluminium oxide along with dihydrogen.
2 Al left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis space plus space straight H subscript 2 straight O left parenthesis straight l right parenthesis space rightwards arrow space space Al subscript 2 straight O subscript 3 left parenthesis straight s right parenthesis space plus space straight H subscript 2 left parenthesis straight g right parenthesis
A very-very small quantity of Al2O3 may dissolve in water to give a few ppm of Al3+ions in the solution. Accumulation of these Al3+ ions can cause permanent damage to the human systems. Hence, drinking water should not be kept in aluminium utensils overnight.