JEE Main 2022 · 28 Jul · Shift 1 · Chemistry Q66

ChemistrySingle correct+4 / -1Question 66 of 90

Which of the reaction is suitable for concentrating ore by leaching process ?

\mathrm{2Cu_2S+3O_2\rightarrow2Cu_2O+2SO_2}

\mathrm{Fe_3O_4+CO\rightarrow3FeO+CO_2}

\mathrm{Al_2O_3+2NaOH+3H_2O\rightarrow2Na[Al(OH)_4]}

\mathrm{Al_2O_3+6Mg\rightarrow6MgO+4Al}

Answer and worked solution

Official answer: C

Leaching dissolves the ore selectively. Bauxite dissolves in NaOH as $\mathrm{Na[Al(OH)_4]}$ .

(C)

Topics:Concentration of ores

JEE Main 2022 · 28 Jul · Shift 1, Chemistry question 66