Discussion
Which one of the following will not react with water to produce H2 gas even at red hot conditions ?
Answer: B
The metal that does not produce hydrogen even at red heat is Be.
Beryllium has a very small atom and a high ionisation energy, and it is protected by a thin, tough film of beryllium oxide. As a result it does not react with water or with steam even when red hot, an exception in Group 2.
The others all give hydrogen. Lithium reacts steadily with cold water, forming lithium hydroxide. Calcium reacts readily with cold water. Magnesium reacts very slowly with cold water but readily with hot water and burns in steam to give magnesium oxide and hydrogen.
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