Which gas is evolved when dilute hydrochloric acid reacts with zinc ? Write the molecular formula of the gas.
Hydrogen gas is evolved. Its molecular formula is H2.
When zinc reacts with dilute hydrochloric acid, zinc chloride is formed along with the evolution of gas X. The evolved gas is colourless, odourless and neutral to litmus. So, gas X is:
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Why?