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(i) Write all the reactions involved in the extraction of $\ce{Zn}$ from $\ce{ZnS}$.
(ii) Hydrogen gas is not evolved when most of the metals react with nitric acid. Give reason.
(ii) Hydrogen gas is not evolved when most of the metals react with nitric acid. Give reason.
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(i) $\ce{2ZnS(s) + 3O2(g) ->[Heat] 2ZnO(s) + 2SO2(g)}$ (1 Mark)
$\ce{ZnO(s) + C(s) -> Zn(s) + CO(g)}$ (1 Mark)
(ii) Nitric acid is a strong oxidising agent and oxidises $\ce{H2}$ gas produced to water. (1 Mark)
$\ce{ZnO(s) + C(s) -> Zn(s) + CO(g)}$ (1 Mark)
(ii) Nitric acid is a strong oxidising agent and oxidises $\ce{H2}$ gas produced to water. (1 Mark)