A) - 1 / 3
B) - 1
C) + 1
D) - 3
Correct Answer: D
$ {{(NH_4)}_2}SO_4 $ - $ 2NH_4^{+}+SO_4^{-,-} $ $ \overset{*}{\mathop{NH_4^{+}}}, $ $ x+4=+1;x=1-4=-3 $ .
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