Which substance is used as a smoke screen in | vedclass

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(A) The substance used as a smoke screen in warfare is $PH_3$ (phosphine). $PH_3$ is used in Holme's signals,where containers containing calcium carbi

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$PH_3$

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(A) The substance used as a smoke screen in warfare is $PH_3$ (phosphine). $PH_3$ is used in Holme's signals,where containers containing calcium carbide $(CaC_2)$ and calcium phosphide $(Ca_3P_2)$ are pierced and thrown into the sea. When these substances come in contact with water,they produce $PH_3$ and $C_2H_2$ (acetylene). The $PH_3$ catches fire and ignites the acetylene,which produces a bright red flame and thick white smoke,acting as a signal or smoke screen.

Which substance is used as a smoke screen in warfare?

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