Which of the constituent is / are responsible for continuous burning in Holmes signal

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Calcium carbide

Aluminum carbide

Calcium phosphide

1 and 2

answer is C.

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Detailed Solution

Mixture of calcium phosphide and calcium carbide is used in Holmes signal. In this mixture, continuous combustion of phosphine takes place which acts as a signal. A container filled with the mixture of calcium phosphide and calcium carbide throws in the sea. The formation of two gases, PH₃ and C₂H₂ burns and serve as a signal.

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