Write the reactions taking place at the ...

ICSE Class 10 Chemistry 2023 Paper

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

Study the diagram and answer the following :

Question : 20 of 88

Marks: +1, -0

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.

2\mathrm{C} + \mathrm{O}_2 \rightarrow 2\mathrm{CO}

2\mathrm{CO} + \mathrm{O}_2 \rightarrow 2\mathrm{CO}_2

6\mathrm{O}^{2-} - 12\mathrm{e}^{-} \rightarrow 6[\mathrm{O}]

3\mathrm{O} + 3\mathrm{O} \rightarrow 3\mathrm{O}_2

At cathode

(Z)-

4\mathrm{Al}^{3+} \; \text{(molten)} \; +12\mathrm{e}^{-} \rightarrow 4\mathrm{Al}(l)

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