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Question

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

A
CaC2+CaCN2
B
CaC2+Ca3P2
C
CaC2+CaCO3
D
Ca3P2+CaCN2
Solution
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Holmes signal - A mixture of calcium carbide and calcium phosphide placed in a container which reacts with water to produce gases (PH3 and C2H2) which burn and thus guide the ships in the sea.

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Similar Questions
Q1
A mixture of Ca3P2 and CaC2, is used in making Holmes signal. Explain.
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Q2
NH3 is formed in the following steps
I. Ca+2CCaC2 50% yield
II. CaC2+N2CaCN2+C 100% yield
III. CaCN2+3H2O2NH3+CaCO3 50% yield
To obtain 2 moles NH3, calcium required is:
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Q3
NH3 is formed in the following steps,
I : Ca+2CCaC2 (50% yield)
II : CaC2+N2CaCN2+C (100% yield)
III : CaCN2+3H2O2NH3+CaCO3 (50% yield)
To obtain 2 moles of NH3, calcium required is :
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Q4
Assertion :Mixture of CaC2 and Ca3P2 placed in the container with holes is thrown into the sea, a luminous flame is produced called Holmes signal Reason: Both react with H2O :
CaC2+2H2O Ca(OH)2 + C2H2
Ca3P2+6H2O3Ca(OH)2+2PH3
Some P2H4 is also produced, which catches fire instantly, which in turn ignites C2H2 (acetylene) and then luminous flame is produced. This guides the approaching ship. This signal is called Holme's signal.

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Q5
In Holmes signal contains CaC2 along with :
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