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【简答题】
A、B、C、D、E是五种中学常见的单质，已知A、B、C、D在常温下均为气态，其中D能分别跟A、B、C在一定条件下两两化合，生成化合物X、Y、Z；A与B、C均不能直接化合，有关的转化关系如下图所示（反应条件均已略去）回答下列问题： ⑴Z分子的空间构型为 ⑵反应③中被氧化的物质与被还原的物质的物质的量之比为 。 ⑶Z和W在催化剂作用下，反应生成C和Y，这是一个很有实际意义的反应，可以消除W对环境的污染，该反应的方程式为 。 ⑷将过量的E加到N的稀溶液中，若过程中转化的电子数目为3.02×10 23 个，则参加反应的E的物质的量为 mol。 ⑸将Z和N反应后的产物溶于水中，则溶液的pH值（填“”） 7，其原因是（用离子方程式表示） 。
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【单选题】哪种有害金属元素中毒可引起骨痛病
A.
汞
B.
铅
C.
砷
D.
镉
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