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Which gas is released when dilute hydrochloric acid reacts with zinc granules?
Oxygen
Chlorine
Hydrogen
Carbon Dioxide
Hydrogen
When zinc metal granules react with dilute hydrochloric acid, a displacement reaction occurs. In this process, zinc displaces hydrogen from the acid to form zinc chloride and releases hydrogen gas.
When zinc metal granules react with dilute hydrochloric acid, a displacement reaction occurs. In this process, zinc displaces hydrogen from the acid to form zinc chloride and releases hydrogen gas.
Think of it like a dance floor where a more energetic dancer (Zinc) cuts in and replaces the current partner (Hydrogen) who is then forced to leave the dance floor as an individual.
MAZIT: Metals + Acid тЖТ Zinc/Metal + Hydrogen + Salt (General pattern)
Zn(s)+2HCl(aq)тЖТZnCl2тАЛ(aq)+H2тАЛ(g) тАФ The balanced chemical equation for the reaction.
This is a single displacement reaction where a more reactive metal (Zinc) displaces hydrogen from an acid. The zinc atom donates two electrons to the hydrogen ions (H+) present in the solution, reducing them to hydrogen gas (H2тАЛ) while zinc is oxidized to zinc ions (Zn2+).
This reaction is exothermic, meaning it releases heat.
The hydrogen gas evolved can be identified by the 'pop' sound produced when a burning splinter is brought near the gas bubbles.
Zinc is more reactive than hydrogen in the reactivity series of metals.
Simple method for laboratory preparation of hydrogen gas.
Not suitable for large-scale industrial gas collection due to cost of reagents.
Laboratory gas preparation experiments.
Demonstration of metal reactivity series.
Option A (Oxygen) is not produced because the reaction is between a metal and an acid, not an oxidation of a metal oxide.
Option B (Chlorine) remains in the salt (Zinc chloride) solution.
Option D (Carbon Dioxide) is released when acids react with metal carbonates or bicarbonates, not pure metals.
C is correct тАФ Zinc metal displaces hydrogen from hydrochloric acid, resulting in the evolution of hydrogen gas.
Remember: Active metals + dilute acids always produce hydrogen gas, while metal carbonates + acids produce carbon dioxide gas.
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