JEE Main 2022 · 24 Jun · Shift 2 · Chemistry Q67

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ChemistrySingle correct+4 / -1Question 67 of 90

Which of the following chemical reactions represents Hall-Heroult Process?

\mathrm{Cr_2O_3+2Al\rightarrow Al_2O_3+2Cr}

\mathrm{2Al_2O_3+3C\rightarrow4Al+3CO_2}

\mathrm{FeO+CO\rightarrow Fe+CO_2}

\mathrm{2[Au(CN)_2]^-_{(aq)}+Zn(s)\rightarrow2Au(s)+[Zn(CN)_4]^{2-}}

Answer and worked solution

Official answer: B

Hall-Héroult process. Electrolysis of alumina dissolved in molten cryolite with carbon anodes, which are oxidised: $\mathrm{2Al_2O_3+3C\rightarrow4Al+3CO_2}$ .

(B)

Topics:Extraction of specific metals

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JEE Main 2022 · 24 Jun · Shift 2, Chemistry question 67