At 1000 K, Delta G deg per mole of O2 for formation of oxides is (in kJ): Al2O3 -1053; MgO -1090; Cr2O3 -600; FeO -420; Cu2O -240. Aluminium can reduce which of the following oxides at 1000 K?

JEE Main levelOne or more correct optionsDifficulty 2 of 3mt205

At 1000 K, $Δ G^{\circ}$ per mole of $O X_{2}$ for formation of oxides is (in kJ): $Al X_{2} O X_{3}$ $- 1053$ ; $MgO$ $- 1090$ ; $Cr X_{2} O X_{3}$ $- 600$ ; $FeO$ $- 420$ ; $Cu X_{2} O$ $- 240$ . Aluminium can reduce which of the following oxides at 1000 K?

Al can reduce an oxide whose formation line lies above its own (

- 1053

). FeO (

- 420

Cr X_{2} O X_{3}

(

- 600

) and

Cu X_{2} O

(

- 240

) are all less negative, so they are reduced. MgO (

- 1090

) is lower, so Al cannot reduce it.