Question

When a small piece of dry sodium is put in water, it reacts vigorously to produce:

• A. nitrogen gas
• B. hydrogen gas
• C. carbon dioxide gas
• D. sulphur dioxide

Answer 1

The correct option is B hydrogen gas

Most of the metals do not react with water. However,alkali metals react vigorously with water. Reaction of sodium metal with water: Sodium metal forms sodium hydroxide and liberates hydrogen gas along with lot of heat when reacts with water.

When sodium reacts with water, sodium hydroxide is formed hydrogen gas as a byproduct that gets burnt with a bright flame making the reaction highly exothermic.