Holme's signals can be given by using

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(B) Holmes signals are produced using a mixture of calcium carbide $(CaC_2)$ and calcium phosphide $(Ca_3P_2)$.When this mixture is placed in a contai

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$CaC_2 + Ca_3P_2$

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(B) Holmes signals are produced using a mixture of calcium carbide $(CaC_2)$ and calcium phosphide $(Ca_3P_2)$.When this mixture is placed in a container and thrown into the sea,it reacts with water.$CaC_2 + 2H_2O \rightarrow Ca(OH)_2 + C_2H_2$ (Acetylene gas)$Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3$ (Phosphine gas)The phosphine gas $(PH_3)$ catches fire spontaneously upon contact with air,which ignites the acetylene gas $(C_2H_2)$,creating a bright flame that serves as a signal for ships.

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