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Which gas is released during the reaction of metal with dilute acid?
Oxygen
Carbon Dioxide
Hydrogen
Nitrogen
Hydrogen
When reactive metals react with dilute acids, they typically displace hydrogen from the acid to form a metal salt and release hydrogen gas. This is a characteristic property of most metals situated above hydrogen in the reactivity series.
When reactive metals react with dilute acids, they typically displace hydrogen from the acid to form a metal salt and release hydrogen gas. This is a characteristic property of most metals situated above hydrogen in the reactivity series.
Think of a metal as a more active guest who pushes hydrogen out of its seat (the acid) and takes its place, causing hydrogen to stand up and leave the room as a gas.
M-A-D-H: Metal And Dilute acid yields Hydrogen.
Metal+DiluteAcidтЖТMetal┬аSalt+H2тАЛтЖС тАФ General reaction for metal and dilute acid
Zn+2HClтЖТZnCl2тАЛ+H2тАЛтЖС тАФ Example with Zinc and Hydrochloric acid
The reaction proceeds via a single displacement mechanism where the metal loses electrons to become a cation, while the hydrogen ions (H+) from the dilute acid accept electrons to form hydrogen gas (H2тАЛ). For example, zinc reacts with dilute hydrochloric acid to produce zinc chloride and hydrogen gas.
Only metals placed above hydrogen in the electrochemical reactivity series can displace hydrogen from dilute acids.
Nitric acid (HNO3тАЛ) is a strong oxidizing agent and usually does not release hydrogen gas with metals, as it oxidizes H2тАЛ to water.
Laboratory preparation of hydrogen gas
Testing and verifying the chemical reactivity of unknown metals
Nitric acid (HNO3тАЛ) is an exception because it is a powerful oxidizing agent that converts the released hydrogen into water (H2тАЛO) and gets reduced to nitrogen oxides instead.
Option A (Oxygen), Option B (Carbon dioxide), and Option D (Nitrogen) are incorrect because they are not the primary gaseous products evolved during standard metal-dilute acid interactions.
C is correct тАФ Hydrogen gas is evolved when reactive metals react with dilute acids due to the displacement of hydrogen ions.
Remember that HNO3тАЛ is a notable exception that does not typically release H2тАЛ gas with most metals due to its strong oxidizing property.
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