In Holmes signal contains $C a C_{2}$ along with :

C a C l_{2}

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C a_{3} P_{2}

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C a_{3} N_{2}

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C a C O_{3}

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Solution

The correct option is B $C a_{3} P_{2}$
Containers containing CaC and $C a_{3} P_{2}$ are pierced and thrown in the sea where the gases evolved burn and serve as signal.

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C a_{3} P_{2}

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⟶

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C a_{3} P_{2} + 6 H_{2} O ⟶ 3 C a (O H)_{2} + 2 P H_{3}

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