Question

A certain metal will liberate hydrogen from dilute acids. It will react with water to form hydrogen only when the metal is heated and the water is in the form of steam.The metal is probably:

• A. Iron
• B. Potassium
• C. Copper
• D. Mercury

Answer 1

The correct option is A Iron

Iron will react with water to form hydrogen only when the metal is heated and the water is in the form of steam.

$Fe\left(s\right)+HCl\left(aq\right)\to FeC{l}_2\left(aq\right)+H_2\left(g\right)$

$2Fe\left(s\right)+3H_{2}O\left(g\right)\to F{e}_2{O}_3\left(s\right)3H_2\left(g\right)$

Hence,option A is correct.