What gas is produced when calcium carbide (CaC2) reacts exothermically with water at room temperature?
Answer and explanation
Correct answer: B. Ethyne (acetylene, C2H2)
- Step 1: Calcium carbide reacts with water: CaC2 + 2 H2O -> Ca(OH)2 + C2H2. Step 2. The organic product is ethyne (acetylene gas), widely used in oxy-acetylene welding torches. Answer: Ethyne (acetylene, C2H2). Why not the others: Aluminum carbide (Al4C3) produces methane; calcium carbide specifically generates acetylene.
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