Holme's signals can be obtained by using

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(B) mixture of $Ca_3P_2$ and $CaC_2$ is used in making Holme's signal.When this mixture comes in contact with water,it produces phosphine $(PH_3)$ and

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$CaC_2 + Ca_3P_2$

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(B) mixture of $Ca_3P_2$ and $CaC_2$ is used in making Holme's signal.When this mixture comes in contact with water,it produces phosphine $(PH_3)$ and acetylene $(C_2H_2)$ gases.The phosphine gas catches fire spontaneously,which ignites the acetylene gas,producing a bright flame that guides ships in the sea.This mixture is also used for creating smoke screens.

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