# For the hypothetical reaction $\mathrm{A}\left(\mathrm{g}\right)⇌\mathrm{B}\left(\mathrm{g}\right)$ at 450 K the value of equilibrium constant is 102 and the value of equilibrium constant becomes 0.5 at 810 K.$\mathrm{\Delta H}$ for the reaction,$\mathrm{A}\left(\mathrm{g}\right)⇌\mathrm{B}\left(\mathrm{g}\right)$ will be

1. A

Positive

2. B

Negative

3. C

Zero

4. D

Cannot be predict

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### Solution:

$\text{'}{\mathrm{K}}_{\mathrm{eq}}\text{'}$ decreases with increase in temperature. The reaction is exothermic.

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