A) \[{{S}_{2}}O_{4}^{2-}\]
B) \[{{S}_{2}}O_{5}^{2-}\]
C) \[{{S}_{2}}O_{3}^{2-}\]
D) \[{{S}_{2}}O_{7}^{2-}\]
Correct Answer: D
Solution :
\[{{S}_{2}}O_{7}^{2-}\] \[MgB{{r}_{2}}+C{{l}_{2}}\,\to \,MgC{{l}_{2}}+B{{r}_{2}}\]
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