Multiple choice

The gas produced by pouring water on calcium carbide is:

  1. Pentane

  2. Methance

  3. Ethance

  4. Acetylene

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When water is poured on calcium carbide (CaC2), acetylene gas (C2H2) is produced through a chemical reaction. The reaction is: CaC2 + 2H2O → Ca(OH)2 + C2H2. Acetylene is used in welding torches and was historically used for lighting. Pentane, methane, and ethane are different hydrocarbons not produced by this reaction.

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