Variation of \( \log _{10} \mathrm{~K} \) with \( \frac{1}{\mathrm{~T}} \) is shown by the follo...

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Variation of \( \log _{10} \mathrm{~K} \) with \( \frac{1}{\mathrm{~T}} \) is shown by the following graph in which straight line is at 45 , hence \( \Delta \mathrm{H} \) is :
(A) \( +4.606 \mathrm{cal} \)
(B) \( -4.606 \mathrm{cal} \)
(C) \( 2 \mathrm{cal} \)
(D) \( -2 \mathrm{cal} \)
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