The correct option is Hydrogen.
Explanation
This question pertains to the chemical properties of metals and their interaction with dilute mineral acids. The reaction is governed by the reactivity series of metals, where metals placed above hydrogen can displace it from acids.
Detailed Analysis:
- Zinc (Zn) is a reactive metal positioned above hydrogen in the electrochemical series (reactivity series).
- When zinc granules react with dilute sulphuric acid ($H_2SO_4$), a single displacement reaction takes place. Zinc displaces hydrogen from the acid to form zinc sulphate ($ZnSO_4$) and releases hydrogen gas ($H_2$).
- The chemical equation for the reaction is:
$Zn(s) + H_2SO_4(aq) \rightarrow ZnSO_4(aq) + H_2(g)$ - The evolution of hydrogen gas is characterized by the formation of bubbles. The standard confirmatory test for hydrogen is bringing a burning splint or candle near the gas; it burns with a characteristic "pop" sound.
- Other gases listed in the options (Oxygen, Nitrogen, Chlorine) are not produced in this specific metal-acid reaction.
Key Takeaway: Active metals (such as Zinc, Magnesium, and Iron) react with dilute acids to produce a corresponding metal salt and evolve hydrogen gas.