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(c) (i) How is copper obtained from its ore ($\ce{Cu2S}$) ? Give equations of the reactions.
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(a) Because it is easier to obtain metal from its oxide. /
Because it is easier to reduce metal oxide to metal (1)
(b)
$\ce{Fe2O3(s)+ 2Al(s) -> 2Fe(l) + Al2O3(s) + Heat}$
$\ce{3MnO2(s) + 4Al(s) -> 3Mn(l) + 2Al2O3(s) + Heat}$ (1)
(balancing is optional) (any one equation)
(c) (i) $\ce{2Cu2S + 3O2(g) ->[Heat] 2Cu2O(s) + 2SO2 (g)}$ (1)
$\ce{2Cu2O + Cu2S ->[Heat] 6Cu(s) + SO2(g)}$ (1)
OR
(c)(ii) (I) Because highly reactive metals have more affinity for
oxygen than carbon. (1)
(II) Because of its low melting point. (1)
Because it is easier to reduce metal oxide to metal (1)
(b)
$\ce{Fe2O3(s)+ 2Al(s) -> 2Fe(l) + Al2O3(s) + Heat}$
$\ce{3MnO2(s) + 4Al(s) -> 3Mn(l) + 2Al2O3(s) + Heat}$ (1)
(balancing is optional) (any one equation)
(c) (i) $\ce{2Cu2S + 3O2(g) ->[Heat] 2Cu2O(s) + 2SO2 (g)}$ (1)
$\ce{2Cu2O + Cu2S ->[Heat] 6Cu(s) + SO2(g)}$ (1)
OR
(c)(ii) (I) Because highly reactive metals have more affinity for
oxygen than carbon. (1)
(II) Because of its low melting point. (1)