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प्रश्न
The enthalpies of the formation of Al2O3 and Cr2O3 are – 1596 kJ and – 1134 kJ, respectively. ∆H for the reaction \[\ce{2Al + Cr2O3 -> 2Cr + Al2O3}\] is
विकल्प
– 1365 kJ
2730 kJ
– 2730 kJ
– 462 kJ
उत्तर
– 462 kJ
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