Question

Which element evolves two gases on reaction with h2so4?

Answer 1

Potassium, Sodium, and Calcium can liberate hydrogen from dilute H2SO4 solution.

The reactions are as follows:

2K + H2SO4 → K2SO4 + H2↑

2Na + H2SO4 → Na2SO4 + H2↑

Ca + H2SO4 → CaSO4 + H2↑

The elements which are below hydrogen in the reactivity series such as gold, silver, mercury cannot liberate hydrogen from dilute H2SO4.