The mixture of calcium carbide and calcium phosphide is actually the Holme’s signal which when reacted with water to produce PH₃ and C₂H₂ gas and guides the ships in the sea. The reaction is shown below- 2 2 2 2 2 3 2 2 2 3 ( ) ( ) CaC H O Ca OH C H Ca P H O Ca OH PH → → Thus, the correct option is (a)
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