28.
Carbon cannot reduce the oxides of sodium, magnesium and aluminium to
their respective metals. Why? Wherein the reactivity series these metals are
placed? How are these metals obtained from their ores? Take an example to
explain the process of extraction along with chemical equations.
5
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Answered by
2
Answer:
....................
Answered by
2
Answer:
According to the reactivity series, both sodium and magnesium as well as aluminium are more reactive than carbon as these elements are placed above carbon in reactivity series.
As a result, being less reactive in nature carbon is unable to reduce oxides of Na,Mg & Al.
Metals of high reactivity such as sodium, magnesium & aluminium etc. are extracted from their ores by electrolytic reduction (Electrolysis) method.
Example: Electrolysis of Molten NaCl
At Anode: Cl
−
→
2
1
Cl
2(g)
+e
−
At Cathode : Na
+
+e
−
→Na
(s)
Overall reaction: 2NaCl→2Na
(s)
+Cl
2(g)
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