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Which gas is evolved when zinc metal reacts with dilute hydrochloric acid?
Oxygen
Hydrogen
Chlorine
Nitrogen
Hydrogen
When an active metal like zinc reacts with a dilute acid such as hydrochloric acid, it displaces hydrogen from the acid, resulting in the evolution of hydrogen gas. This is a classic example of a single displacement reaction.
When an active metal like zinc reacts with a dilute acid such as hydrochloric acid, it displaces hydrogen from the acid, resulting in the evolution of hydrogen gas. This is a classic example of a single displacement reaction.
Think of it like a metal stepping in to take hydrogen's place in a chemical partnership with chlorine, leaving hydrogen free to float away as a gas.
Zn+2HCl\rightarrow ZnCl_2 + H_2 тАФ Reaction of zinc with dilute hydrochloric acid
2H++2eтБ╗ \rightarrow H_2 тАФ Reduction half-reaction
Zinc is more reactive than hydrogen in the reactivity series and readily loses electrons to form zinc ions (Zn2+).These electrons are accepted by hydrogen ions (H+)from the acid to form hydrogen gas (H_2), which escapes with effervescence.
Metals placed above hydrogen in the reactivity series can displace hydrogen from dilute acids.
The evolved hydrogen gas can be tested by bringing a burning splinter near it, which produces a characteristic pop sound.
Laboratory preparation of hydrogen gas
Studying chemical properties of metals and acids
Option A (Oxygen) is incorrect as oxygen is not released in standard metal-acid reactions.
Option C (Chlorine) remains in solution as part of the zinc chloride salt.
Option D (Nitrogen) is unreactive under these conditions.
B is correct тАФ Hydrogen gas is evolved when zinc reacts with dilute hydrochloric acid.
Remember that metals below hydrogen in the reactivity series (like copper or silver) do not react with dilute acids to evolve hydrogen gas.
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