The compound that is used in smoke screens is

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(D) smoke screen is a dense cloud of smoke used to conceal military positions. Calcium phosphide $(Ca_3P_2)$ reacts with water to produce phosphine $(

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$Ca_3P_2$

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(D) smoke screen is a dense cloud of smoke used to conceal military positions. Calcium phosphide $(Ca_3P_2)$ reacts with water to produce phosphine $(PH_3)$ gas: $Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3$ Phosphine $(PH_3)$ is spontaneously flammable in air and burns to form phosphorus pentoxide $(P_2O_5)$: $2PH_3 + 4O_2 \rightarrow P_2O_5 + 3H_2O$ The resulting $P_2O_5$ forms a dense white smoke screen.

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