Question

Question 4
Which one of the following metals does not react with cold as well as hot water?

a) Na
(b) Ca
(c) Mg
(d) Fe

Answer 1

Option (d) is correct.

Iron does not react with cold water as well as hot water but red-hot iron reacts with steam to give its respective oxide and hydrogen gas.

$3\text{Fe(s)}+4{\text{H}}_2\text{O(g)}\to {\text{Fe}}_3{\text{O}}_4\text{(s)}+4{\text{H}}_2\text{(g)}$