HARDMCQ SINGLEJEE Advanced 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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