Easy
Which of the following chemical reactions represents the Hall-Heroult process?
- A$Cr_2O_3 + 2 Al \rightarrow Al_2O_3 + 2 Cr$
- B$2 Al_2O_3 + 3 C \rightarrow 4 Al + 3 CO_2$
- C$FeO + CO \rightarrow Fe + CO_2$
- D$2[Au(CN)_2]_{(aq)}^{-} + Zn_{(s)} \rightarrow 2 Au_{(s)} + [Zn(CN)_4]^{2-}$
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Reason : Blisters are produced on the surface of the metal due to escaping of dissolved $SO_2$.
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