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Chemistry
Chemistry
Problem
Which of the following reduction reactions are actually employed in commercial extraction of metals? a.
Fe
2
O
3
+
2
Al
⟶
Al
2
O
3
+
2
Fe
\text{Fe}_2\text{O}_3 + 2\text{Al} \longrightarrow \text{Al}_2\text{O}_3 + 2\text{Fe}
Fe
2
O
3
+
2
Al
⟶
Al
2
O
3
+
2
Fe
b.
Cr
2
O
3
+
2
Al
⟶
Al
2
O
3
+
2
Cr
\text{Cr}_2\text{O}_3 + 2\text{Al} \longrightarrow \text{Al}_2\text{O}_3 + 2\text{Cr}
Cr
2
O
3
+
2
Al
⟶
Al
2
O
3
+
2
Cr
c.
2
Na
[
Au
(
CN
)
2
]
+
Zn
⟶
Na
2
[
Zn
(
CN
)
4
]
+
2
Au
2\text{Na}[\text{Au}(\text{CN})_2] + \text{Zn} \longrightarrow \text{Na}_2[\text{Zn}(\text{CN})_4] + 2\text{Au}
2
Na
[
Au
(
CN
)
2
]
+
Zn
⟶
Na
2
[
Zn
(
CN
)
4
]
+
2
Au
d.
Cu
2
S
+
Pb
⟶
Cu
+
PbS
↓
\text{Cu}_2\text{S} + \text{Pb} \longrightarrow \text{Cu} + \text{PbS} \downarrow
Cu
2
S
+
Pb
⟶
Cu
+
PbS
↓
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