Question
Name the gas produced when calamine ore is calcined.
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$\ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \text{H} \ \ \ \ \ \text{O} \ \ \ \ \ \ \\ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ \ | \ \ \ \ \ \ || \\\text{H}-\text{C}-\text{C}-\text{C}-\text{OH}\\ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \text{H}\ \ \ \ \text{H}$
$2\text{NaCl(l)}\xrightarrow{\text{Electric current}}2\text{Na}(\text{s})+\text{Cl}_2(\text{g})$
$\text{Na}\ +\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Na}_2\text{O}$