Discussion
Identify the metals on the basis of their reaction with water.
A - reacts violently with cold water
B - reacts with steam only
C - does not react with water
Answer: C
The metals are Potassium, Iron, Copper.
Potassium reacts violently with cold water, so violently that the hydrogen released catches fire (A). Iron does not react with cold or hot water but reacts with steam to form iron oxide and hydrogen (B). Copper does not react with water at all (C).
The other options misplace a metal. In option 1, iron is put among metals that do not react with water, but it reacts with steam, and calcium reacts with cold water much less violently than potassium. In option 2, magnesium does not react violently with cold water. In option 4, copper is listed as reacting with steam, which it does not, and aluminium as not reacting with water, though it reacts with steam.
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