Which gas is released when zinc reacts with dilute hydrochloric acid?
Answer and explanation
Correct answer: D. Hydrogen
- Step 1: Write the balanced single displacement reaction between metallic zinc and dilute hydrochloric acid: .
- Step 2: Zinc is oxidized to , while hydrogen ions () are reduced to diatomic hydrogen gas.
- Step 3: The evolved gas is hydrogen.
Answer
Hydrogen.
Why not the others: The alternative options (Chlorine, Oxygen, Carbon dioxide) correspond to incorrect stoichiometric ratios, wrong reaction intermediates, or arithmetic evaluation errors.
Practise more Periodic properties.
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