2.
\(\rm{29.}\)在淀粉\(\rm{-KI}\)溶液中存在下列平衡:\(\rm{I_{2}(aq)+I^{-}(aq)⇌ I\rlap{_{3}}{^{-}}(aq)}\)。测得不同温度下该反应的平衡常数\(\rm{K}\)如表所示:
\(\rm{T/℃}\) | \(\rm{5}\) | \(\rm{15}\) | \(\rm{25}\) | \(\rm{35}\) | \(\rm{50}\) |
\(\rm{K}\) | \(\rm{1 100}\) | \(\rm{841}\) | \(\rm{689}\) | \(\rm{533}\) | \(\rm{409}\) |
下列说法正确的是 \(\rm{(}\) \(\rm{)}\)