Q

Which of the following metals does NOT react with cold or hot water?

ALP CBT-1, 17-Aug-18 S-1 2018
✓ Answer: D Aluminium
Aluminium does not react with either cold or hot water because its surface is protected by a thin, stable layer of aluminium oxide. However, it reacts with steam to form aluminium oxide and hydrogen gas: 2Al + 3H2O (steam) → Al2O3 + 3H2. Sodium and potassium react vigorously with cold water, while calcium also reacts with cold water, though less vigorously.
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