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Which gas is released when dilute hydrochloric acid reacts with zinc metal?
Oxygen
Carbon dioxide
Hydrogen
Nitrogen
Hydrogen
When a metal reacts with a dilute acid, it displaces the hydrogen atom from the acid, resulting in the evolution of hydrogen gas and the formation of a metallic salt. In this specific case, zinc metal reacts with hydrochloric acid to produce zinc chloride and hydrogen gas.
When a metal reacts with a dilute acid, it displaces the hydrogen atom from the acid, resulting in the evolution of hydrogen gas and the formation of a metallic salt. In this specific case, zinc metal reacts with hydrochloric acid to produce zinc chloride and hydrogen gas.
Think of it like a stronger teammate (Zinc) pushing a weaker teammate (Hydrogen) off a bench (the Acid molecule) so that the stronger teammate can sit down with the remaining partner (Chloride).
M-A-S-H: Metal + Acid = Salt + Hydrogen
Zn(s)+2HCl(aq)тЖТZnCl2тАЛ(aq)+H2тАЛ(g) тАФ The balanced chemical equation for the reaction of Zinc with Hydrochloric acid.
This is a single displacement reaction where zinc, being more reactive than hydrogen, displaces it from the hydrochloric acid. The zinc atom loses two electrons to form the Zn2+ ion, which then reacts with the chloride ions. Simultaneously, the two hydrogen ions (H+) gain those electrons to form hydrogen gas (H2тАЛ).
The hydrogen gas evolved can be identified by the 'pop' sound produced when a burning splinter is brought near the gas.
This reaction is an example of an exothermic process, releasing heat energy.
Only metals situated above hydrogen in the reactivity series can displace hydrogen from dilute acids.
Efficient way to produce small quantities of hydrogen gas in a laboratory setting.
Not suitable for mass-scale industrial production due to the cost of zinc and acid handling.
Laboratory preparation of hydrogen gas.
Demonstration of metal reactivity series in educational experiments.
The reactivity series is: K > Na > Ca > Mg > Al > Zn > Fe > Pb > (H) > Cu > Ag > Au.
Option A (Oxygen) is incorrect because metals do not produce oxygen gas with dilute acids. Option B (Carbon dioxide) is released when acids react with carbonates or bicarbonates. Option D (Nitrogen) is typically inert in these acid-metal reactions.
C is correct тАФ Zinc is more reactive than hydrogen and displaces it from dilute hydrochloric acid to form hydrogen gas.
Remember that carbonates and bicarbonates react with acids to produce CO2тАЛ, while metals react with acids to produce H2тАЛ. Do not confuse the gas products for these two common reaction types.
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