Give the industrial preparation method of ethyne.

(N/A) $(i)$ Quick lime is obtained by heating limestone:
$CaCO_{3(s)} \xrightarrow{\Delta} CaO_{(s)} + CO_{2(g)}$
$(ii)$ Calcium oxide is heated with coke to obtain calcium carbide:
$CaO_{(s)} + 3C_{(s)} \xrightarrow{\Delta} CaC_{2(s)} + CO_{(g)}$
$(iii)$ Calcium carbide reacts with water to produce ethyne:
$CaC_{2(s)} + 2H_{2}O_{(l)} \longrightarrow Ca(OH)_{2(aq)} + C_{2}H_{2(g)}$
This is the standard industrial process for the production of ethyne.