Question

Which one of the following metal do not react with cold or hot water?

• A. Sodium (Na)
• B. Calcium (Ca)
• C. Magnesium (Mg)
• D. Iron (Fe)

Answer 1

The correct option is D Iron (Fe)

Reaction of metals with cold or hot water depends on the reactivity of the metals.
Reactive metals like sodium, potassium, calcium, etc. react with cold or hot water.
Moderately reactive metals like magnesium react with hot water.
Less reactive metals do not react with cold or hot water but react with steam.
Least reactive metals like gold, silver, etc. do not react at all.

Less reactive metals like iron react with steam to form an oxide and release hydrogen gas. The reaction is as follows:

$3Fe\left(s\right)+4H_{2}O\left(g\right)\to F{e}_3{O}_4\left(s\right)+4H_2\left(g\right)$