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Grade: 12

                        

Which gas is used in holmes signal and how?

6 years ago

Answers : (6)

ruchi yadav
askIITians Faculty
27 Points
							The spontaneous combustion of phosphine is technically used in Holme's
signals. Containers containing calciumcarbide and calcium phosphide are
pierced and thrown in the sea when the gases evolved burn and serve as a
signal . It is also used in smoke screens.
Containers which have a perforated bottom and a hole at the top are filed with calcium phosphide and calcium carbide. These are thrown into the sea. Waterebters the containersthrough the bottom and and reacts to give acetylene and phosphine. Phosphine gets ignited spontaneously as it comes in contact with air and also ignites acetylene. Thus a bright red flame is produced which is accompanied by huge smoke due to the burning of phosphine. This serves as a signal to the approaching ships.

Thanks
Ruchi
Askiitians Faculty
6 years ago
DINESHKUMAR G
48 Points
							
containers which have a perforated bottom and a hole at the top are filled with calcium carbide and calcium phosphide.The cointainer thrown into water.Water enter the container and reacts to give C2H2 and PH3. PH3 gets ignited spontaneously and also ignites C2H2 .Thus a Bright red flame is produced accompanies by huge smoke due to burning of PH3
            
                         Ca3P2+6H2O.......>2PH3+3Ca(OH)2
                          CaC2+2H2O........>C2H2+Ca(OH)2
2 years ago
DINESHKUMAR G
48 Points
							

Actually, packets containing calcium carbide and calcium phosphide are pierced and thrown into water which then react with water to form C2H2 and PH3.

CaC2 + H2O → Ca(OH)2 + C2H2 (1)

Ca3P2 + H2O → Ca(OH)2 + PH3 (2)

P2H4, by product of the reaction of calcium phosphide with water, catches fire immediately and ultimately burns PH3 and C2H2 also.

This acts as a signal for other ships/ aeroplanes that they need some sort of help.

2 years ago
DINESHKUMAR G
48 Points
							
Containers containing calcium carbide and calcium phosphide are pierced and thrown in the sea when the gases evolved burn and serve as a signal. It is also used in smoke screens.
 
After making two holes these container are thrown in sea on reacting with water calcium carbide produce scetylene and calcium phosphide produce phosphine,along with phosphine,some amount of P2H4 is also produced,and it catches fire instantly,along with other two gases,luminous flame of acetylene serve as a signal
2 years ago
DINESHKUMAR G
48 Points
							
The spontaneous combustion of phosphine is technically used in Holme's 
signals. Containers containing calcium carbide and calcium phosphide are 
pierced and thrown in the sea when the gases evolved burn and serve as a 
signal. It is also used in smoke screens.
 
2 years ago
Yash Chourasiya
askIITians Faculty
246 Points
							Dear Student


The spontaneous combustion of phosphine is technically used in Holme's signals.

Working :Containers containing calciumcarbide and calcium phosphide are pierced and thrown in the sea when the gases evolved burn and serve as a signal . It is also used in smoke screens.
Containers which have a perforated bottom and a hole at the top are filed with calcium phosphide and calcium carbide. These are thrown into the sea. Waterebters the containersthrough the bottom and and reacts to give acetylene and phosphine. Phosphine gets ignited spontaneously as it comes in contact with air and also ignites acetylene. Thus a bright red flame is produced which is accompanied by huge smoke due to the burning of phosphine. This serves as a signal to the approaching ships.

I hope this answer will help you.
Thanks & Regards
Yash Chourasiya
2 months ago
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