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Standard entropy of \( \mathrm{X}_{2}, \mathrm{Y}_{2} \) and \( \mathrm{XY}_{3} \) are 60,40 and \( 50 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} \), respectively. For the reaction, \( \frac{1}{2} \mathrm{X}_{2}+\frac{3}{2} \mathrm{Y}_{2} \rightarrow \mathrm{XY}_{3}, \Delta \mathrm{H}=-30 \mathrm{~kJ} \), to be at equilibrium, the temperature will be
(1) \( 1250 \mathrm{~K} \)
(2) \( 500 \mathrm{~K} \)
(3) \( 750 \mathrm{~K} \)
(4) \( 1000 \mathrm{~K} \)
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