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A mixture of "Ca"(3)"P"(2) and "CaC"(2) ...

A mixture of `"Ca"_(3)"P"_(2)` and `"CaC"_(2)` is used in making Holme's signal - Explain.

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The spontaneous combustion of phosphine is technically used in Holme.s signals. Containers containing calcium phosphide and calcium carbide are pierced and thrown in the sea when the gases : evolved burn and serve as a signal.
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