Which compound is used in smoke screens?

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(C) Smoke screens are produced using calcium phosphide $(Ca_3P_2)$.When $Ca_3P_2$ comes in contact with water,it undergoes hydrolysis to produce phosp

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$Ca_3P_2$

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(C) Smoke screens are produced using calcium phosphide $(Ca_3P_2)$.When $Ca_3P_2$ comes in contact with water,it undergoes hydrolysis to produce phosphine gas $(PH_3)$.The reaction is: $Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3$.Phosphine gas is spontaneously inflammable in air and produces dense white fumes of phosphoric acid $(H_3PO_4)$,which act as a smoke screen.

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