Holmes signals can be given by using (1) CaC2 + CaCN2 (2) CaC2 + Ca3P2 (3) CaC2 + CaCO3 (4) Ca3P2 + CaCN2

Answer: (2)

Containers containing calcium carbide and calcium phosphide gas known as holmes signal and which reacts with H2O to generate PH3 and C2H2 gases. These gasses burn and consequently give the signal.

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