ICSE Class 10 Chemistry 2023 Solved 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 {\C}+ {\O}_2\;→ 2 {\CO}

2 {\CO}+ {\O}_2\;→ 2 {\CO}_2

6 {\O}^{2-}-12 e^{-}\;→ 6[ {\O}]

3 {\O}+3 {\O}\;→ 3 {\O}_2

At cathode

( {\Z})-

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

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