A) + 5
B) + 3
C) - 5
D) - 3
Correct Answer: D
$ NH_4Cl $ - $ NH_4^{+}+C{{l}^{-}} $ $ \overset{*,}{\mathop{NH_4^{+}}}, $ $ x+4=+1 $ ; $ x=1-4=-3 $ .
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