Question

A metal 'A' reacts violently with cold water and the released gas catches fire. Another metal 'B' floats on water and moves rapidly on the surface. Metal 'C' does not react with cold or hot water but reacts with steam. Metal 'D' does not react with water in any form. Identify metals 'A', 'B', 'C', and 'D'.

Hint:

The reactivity of metals with water decreases down the reactivity series. Sodium and potassium react vigorously, iron reacts with steam, and noble metals like gold and silver do not react.

Answer 1

Based on chemical reactivity with water:
Metal A: Sodium (Na) — Reacts violently with cold water and the released hydrogen gas catches fire.
Metal B: Potassium (K) — Reacts with water, floats and moves on the surface.
Metal C: Iron (Fe) — Reacts only with steam, not with cold or hot water.
Metal D: Gold (Au) or Silver (Ag) — Does not react with water at all.