JEE Main 202228 Jul, Morning shiftChemistryEasyIsolation of Elements99× since 2002Which of the reaction is suitable for concentrating ore by leaching process ?AOption A. 2Cu2 S+3O2→2Cu2O+2SO22 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2}2Cu2 S+3O2→2Cu2O+2SO2BOption B. Fe3O4+CO→3FeO+CO2\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO} \rightarrow 3 \mathrm{FeO}+\mathrm{CO}_{2}Fe3O4+CO→3FeO+CO2COption C. Al2O3+2NaOH+3H2O→2Na[Al(OH)4]\mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{NaOH}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]Al2O3+2NaOH+3H2O→2Na[Al(OH)4]DOption D. Al2O3+6Mg→6MgO+4Al\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{Mg} \rightarrow 6 \mathrm{MgO}+4 \mathrm{Al}Al2O3+6Mg→6MgO+4AlCheckSkip · show solution
