A) \[CrO_{4}^{2-}\xrightarrow{{}}C{{r}_{2}}O{{_{7}^{2-}}^{~}}\]
B) \[Cr\xrightarrow{{}}CrC{{l}_{3}}\]
C) \[Na\xrightarrow{{}}N{{a}^{+}}\]
D) \[2{{S}_{2}}O_{3}^{2-}\xrightarrow{{}}{{S}_{4}}O_{6}^{2-}\]
Correct Answer: A
Solution :
[a] O. N. of Cr on both sides is+6.
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