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JEE Main Chemistry question

ChemistryThermodynamicsJEE Main

The enthalpies of formation of and are and respectively. for the reaction, 2Al + Cr_2O_3 \rightarrow 2Cr + Al_2O_3 is **[RPET 2005]**

Answer: (B)

Solution

Reversing the formation equation gives , .

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Question ID VK-134805