Holme's signals can be obtained by using

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(B) Holme's signals are produced by a mixture of calcium carbide $(CaC_2)$ and calcium phosphide $(Ca_3P_2)$.When this mixture is placed in a containe

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$CaC_2 + Ca_3P_2$

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(B) Holme's signals are produced by a mixture of calcium carbide $(CaC_2)$ and calcium phosphide $(Ca_3P_2)$.When this mixture is placed in a container and thrown into the sea,it reacts with water.Calcium carbide reacts with water to produce acetylene gas $(C_2H_2)$,and calcium phosphide reacts with water to produce phosphine gas $(PH_3)$.The phosphine gas catches fire spontaneously upon contact with air,which in turn ignites the acetylene gas,creating a bright flame that acts as a signal to guide ships in the sea.

Column-$I$ (Compound)	Column-$II$ (Products of heating effect)
$a$. $LiNO_3$	$P$. Metal oxide
$b$. $FeSO_4 \cdot 7H_2O$	$Q$. Paramagnetic gas
$c$. $NaHCO_3$	$R$. Acidic gas
$d$. $BeCO_3$	$S$. Evolved gas has same number of $\sigma$ and $\pi$ bonds

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