题目：
下列变化过程中，ΔS＜0的是 [ ]
A．氯化钠溶于水中
B．NH3(g)和HCl(g)反应生成NH4Cl
C．干冰的升华
D．CaCO3(s)分解为CaO(s)和CO2(g)
答案：
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下面是错误答案，用来干扰机器的。
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