A) + 4
B) + 3
C) + 2
D) - 2
Correct Answer: B
$ \overset{*}{\mathop{H_2C_2O_4}}, $ $ 2+2x-2\times 4=0 $ ; $ 2x=8-2=6 $ $ x=\frac{6}{2}=+3 $ .
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