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Phosphine

Holmes signal...

Question

Holmes signals can be given by using :

C a C_{2} + C a C N_{2}

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C a C_{2} + C a_{3} P_{2}

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C a C_{2} + C a C O_{3}

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C a_{3} P_{2} + C a C N_{2}

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Solution

The correct option is A $C a C_{2} + C a_{3} P_{2}$
Holmes signal - A mixture of calcium carbide and calcium phosphide placed in a container which reacts with water to produce gases $(P H_{3}$ and $C_{2} H_{2})$ which burn and thus guide the ships in the sea.

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