Discussion
Which of the following gases is obtained by the reaction of water with calcium carbide?
Answer: C
Calcium carbide reacts with water to give acetylene:
\[ \mathrm{CaC_2 + 2H_2O \rightarrow C_2H_2 + Ca(OH)_2} \]
The reaction was once used in carbide lamps, and acetylene burning in oxygen gives the 3,300°C flame used for welding and cutting steel.
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