Which gas is evolved when dilute sulfuric acid reacts with reactive metals such as magnesium?

💡 Solution & Explanation

When an active metal like magnesium reacts with a dilute acid such as sulfuric acid, metal sulfate is formed and hydrogen gas is released with effervescence. Oxygen supports combustion, carbon dioxide turns lime water milky, and nitrogen is largely inert under normal conditions. The evolved hydrogen gas burns with a characteristic pop sound when a burning splinter is brought near.