Question

what is holmes signal

Answer 1

Answer:

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

Explanation:

Answer 2

Holmes signal.

Explanation:

• When  calcium carbide and calcium phosphide mixture is kept in container it undergoes a reaction with the water liberating gases like $PH_3$​ and $C_2H_2$

• This gas evolves guiding the ships that comes sailing in the sea.

• It also involved in smoke screens

• Containers which have a perforated base and the hole at the top are filled with this mixture of calcium phosphide and clacium carbide and are thrown into the sea.

• Water enters the container through the bottom and reacts to give acetylene and phosphine.

• Phosphine gets ignited spontaneously as it comes in contact with air and also ignites aceteline. Thus a bright red flame is produced which is accompanied by huge smoke

Learn more about Holmes signal:

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