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Question

In which of these cases will H2 gas be produced?
  1. Na+H2O (cold)
  2. Fe+H2O(cold)
  3. Mg+H2O (cold)
  4. Ca+H2O (hot)


Solution

The correct options are
A Na+H2O (cold)
D Ca+H2O (hot)
Sodium and calcium being highly reactive metals, react with cold water, other than hot water and steam, and liberate H2 gas (which catches fire). 

Again, Iron being a low reactive metal reacts only with steam to liberate hydrogen gas. It does not react with cold water.

Mg, though is a reactive metal, reacts only with warm water and steam and does not liberate H2 on reacting with cold water.

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