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【单选题】
在水溶液中，YO 3 n － 和S 2- 发生如下反应：YO 3 n － + 3S 2 － +6H + = Y － + 3S↓+ 3H 2 O，则YO 3 n － 中Y元素的化合价和原子最外层电子数分别为A.
+4、6
B.
+7、7
C.
+5、7
D.
+5、5
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