805Every Day ScienceMedium
When an acid reacts with a metal, which one of the following gas is usually liberated?
AHydrogen gas
BOxygen
CChlorine
DAmmonia Gas
Correct answer
A. Hydrogen gas
Explanation
When metal reacts with acid, a soap bubble is formed and the bubble contains Hydrogen gas (example: HCl, H2SO4). Hydrogen gas is liberated when anacid reacts with a metal. For example, when zin cmetal reacts with dil. hydrogen is evolved and salt zinc chloride is formed as: It can be tested bybringing a burning candle near thegas.