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【单选题】
某金属单质能与足量浓硝酸反应，放出NO 2 气体，若参加反应的金属单质与硝酸的物质的量之比为1：ａ，则该金属元素在反应后生成的硝酸盐中的化合价是
A.
+2a
B.
+a
C.
+a/2
D.
+a/4
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