Which substance is used to produce smoke scre | vedclass

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(A) smoke screen is a mass of dense artificial smoke used to conceal military areas or operations from an enemy. It is produced by calcium phosphide $

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Calcium phosphide

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(A) smoke screen is a mass of dense artificial smoke used to conceal military areas or operations from an enemy. It is produced by calcium phosphide $(Ca_3P_2)$.When $Ca_3P_2$ reacts with water,it produces phosphine gas $(PH_3)$:$Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3$The phosphine $(PH_3)$ formed spontaneously catches fire in the air to produce phosphorus pentoxide $(P_2O_5)$:$2PH_3 + 4O_2 \rightarrow P_2O_5 + 3H_2O$$P_2O_5$ forms a white,dense smoke screen.

Which substance is used to produce smoke screens?

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