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Question

Which is used to produce smoke screens?
  1. Sodium carbonate
  2. Zinc phosphide
  3. Calcium phosphide
  4. Zinc sulphide

A
Sodium carbonate
B
Zinc phosphide
C
Zinc sulphide
D
Calcium phosphide
Solution
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PH3 is formed there along with acetylene under the reaction of Ca3P2 with CaC2 where , the phosphene reacts with acetylene formed and catches fire to get smoke which forms the smoke screen.

In Holme's singal , the calcium phosphide and calcium carbide is thrown in sea where the reaction produces phosphene gas and acetylene and the phosphene catches fire with acetylene and forms smoke which sends the signal

Ca3P2+6HO 3Ca(OH)2+2PH3

2PH3 +4O2 P2O5+ 3H2O

P2O5 forms white dense smoke screen.

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