题目内容

在一定条件下,下列各反应已处于平衡状态,当压力改变时,平衡状态未受到明显影响的反应是

A. H2(g) + I2(s) = 2HI(g)
B. 2H2(g) + O2(g) = 2H2O(g)
C. 2SO2(g) + O2(g) = 2SO3(g)
D. S(s) + Hg(l) = HgS(s)

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