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【单选题】
19-2．下列有关物质性质、结构的表述均正确，且存在因果关系的是: 表述Ⅰ 表述Ⅱ
A.
在水中，NaCl的溶解度比I2的溶解度大 NaCl晶体中C1—与Na+间的作用力大于碘晶体中分子间的作用力
B.
通常条件下，CH4分子比PbH4分子稳定性高 Pb的原子半径比C的大，Pb与H之间的键能比C与H间的小
C.
在形成化合物时，同一主族元素的化合价相同 同一主族元素原子的最外层电子数相同
D.
P4O10、C6H12O6溶于均不导电 P4O10、C6H12O6均属于共价化合物
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