Phosphorous compound used in Holme's signals is

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$C a_{3} P_{2}$

$P_{2} O_{3}$

$P H_{3}$

$P_{2} O_{5}$

answer is B.

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Detailed Solution

Holmes signal - A mixture of calcium carbide and calcium phosphide placed in a container which reacts with water to produce gases ( PH₃ & C₂H₂ ) which burn and thus guide the ships in sea.so PH₃ gas that is called PHOSPHINE is used in holmes signal.

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