The value of [tex]Δ_{1}[/text]G‘ for formation of Cr₂O₃ is - 540 kJmol⁻¹ and that of Al₂O₃ is - 827 kJmol⁻¹.ls the reduction of Cr₂O₃ possible with Al.
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The value of for the formation of Cr2O3from Cr (−540 kJmol−1) is higher than that of Al2O3 from Al (−827 kJmol−1). Therefore, Al can reduce Cr2O3 to Cr. Hence, the reduction of Cr2O3 with Al is possible
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