HARDMCQ SINGLEJEE Mains ChemistryInorganic Chemistryp -Block Elements (group 15-18)Achiever Section
Which is not correct regarding the Holme’s signal?
A.PH₃ catches fire in contact of air spontaneously.✓ Correct
B.P₂H₄ catches fire in contact of air spontaneously.
C.PH₃, C₂H₂ and P₂H₄ are formed together
D.All the gases burn together
Explanation
The mixture of calcium carbide and calcium phosphide is actually the Holme’s signal which when reacted with water to produce PH₃ and C₂H₂ gas and guides the ships in the sea. The reaction is shown below- 2 2 2 2 2 3 2 2 2 3 ( ) ( ) CaC H O Ca OH C H Ca P H O Ca OH PH → → Thus, the correct option is (a)
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