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Q.

Holme's signals for guiding of ships are given by using

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a

CaC2+CaCN2

b

CaC2+Ca3P2

c

CaC2+CaCO3

d

Ca3P2+CaCN2

answer is B.

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Detailed Solution

CaC2+H2O⟶Ca(OH)2+CH≡CHCa3P2+6H2O⟶3Ca(OH)2+2PH3CaC2 and Ca3P2 in two different containers (with holes) are thrown into sea water. PH3, Some P2H4 and H2 are formed which are spontaneously flammable gases. CH≡CH formed catches fire immediately (even in water) and thus can guide the path for missing ships.
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Holme's signals for guiding of ships are given by using