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【单选题】
反应 CaCO 3 ( S ) ═ CaO ( S ) +CO 2 ( g )在高温时正反应自发进行,其逆反应在 298K 自发的,则逆反应的 Δ r H m θ 和 Δ r S m θ 。
A.
Δ r H m θ ＞ 0 ， Δ r S m θ ＞ 0
B.
Δ r H m θ ＞ 0 ， Δ r S m θ ＜ 0
C.
Δ r H m θ ＜ 0 ， Δ r S m θ ＞ 0
D.
Δ r H m θ ＜ 0 ， Δ r S m θ ＜ 0
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