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Q.

If the heats of formation of Al₂O₃ and Fe₂O₃ are –400 K.Cal and –190 K.Cal respectively, the heat of the following reaction is
2Fe + Al₂O₃ $\overset{}{\to}$ 2Al + Fe₂O₃

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a

590 K.Cal

b

210 K.Cal

c

–210 K.Cal

d

–590 K.Cal

answer is D.

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Detailed Solution

$∆_{r} H = (2 ∆_{f} H_{Al} + ∆_{f} H_{{Fe}_{2} O_{3}}) - (2 ∆_{f} H_{Fe} + ∆_{f} H_{{Al}_{2} O_{3}})$

=(0-190)-(-400+0)=210Kcal

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