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ICSE Class 10 Chemistry 2023 Solved Paper

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The following sketch illustrates the process of conversion of Alumina to Aluminum :

Study the diagram and answer the following :
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Question : 20
Total: 88
Write the reactions taking place at the electrodes ' Y ' (anodes) and ' Z ' (cathode) respectively.
Solution:  
At anode ( Y) - at anode carbon is oxidised to carbonmonoxide then carbon dioxide.
2C+O2‌→2‌CO
2‌CO+O2‌→2CO2
6O2−−12e−‌→6[O]
3O+3O‌→3O2
At cathode (Z)−
4Al3+‌ (molten) ‌+12e−→4‌Al(l)
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