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Which gas is evolved when Zinc reacts with Dilute Sulfuric Acid?
Oxygen
Hydrogen
Carbon Dioxide
Sulfur Dioxide
Hydrogen
When an active metal like zinc reacts with a dilute acid such as sulfuric acid, a single displacement reaction takes place. Zinc displaces hydrogen from the acid, producing aqueous zinc sulfate and evolving hydrogen gas.
When an active metal like zinc reacts with a dilute acid such as sulfuric acid, a single displacement reaction takes place. Zinc displaces hydrogen from the acid, producing aqueous zinc sulfate and evolving hydrogen gas.
Think of zinc as a more dominant element that pushes hydrogen out of its place in the compound, much like a stronger player taking over a spot in a game, leaving hydrogen free to escape as a gas.
AMDH: Active Metals Displace Hydrogen from dilute acids.
Zn+H2тАЛSO4тАЛтЖТZnSO4тАЛ+H2тАЛтЖС тАФ Reaction of zinc with dilute sulfuric acid
Because zinc is placed above hydrogen in the metal reactivity series, it readily loses electrons to hydrogen ions in the acid. The reaction proceeds as: Zn+H2тАЛSO4тАЛтЖТZnSO4тАЛ+H2тАЛтЖС.
Metals above hydrogen in the reactivity series liberate hydrogen gas when treated with 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
Understanding the relative reactivity of metals
Option A (Oxygen) is incorrect as it is not produced in standard acid-metal reactions.
Option C (Carbon dioxide) is evolved when metal carbonates or bicarbonates react with acids.
Option D (Sulfur dioxide) is produced when metals react with hot, concentrated sulfuric acid rather than dilute sulfuric acid.
B is correct тАФ Hydrogen gas is evolved when zinc reacts with dilute sulfuric acid.
Always remember that metals below hydrogen in the reactivity series (like copper, silver, and gold) do not react with dilute acids to evolve hydrogen gas.
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