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Q.

Phosphine is used in

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a

Holme's signals

b

smoke screens

c

containers containing calcium carbide and calcium phosphide are pierced and thrown in sea, when the gases burn and serve as a signal

d

All of the above

answer is D.

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Detailed Solution

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