[IIT 1991; CPMT 1999; DCE 2000]
A) $ S_2O_4^{2-} $
B) $ S_2O_5^{2-} $
C) $ S_2O_3^{2-} $
D) $ S_2O_7^{2-} $
Correct Answer: D
$ S_2O_7^{2-} $ $ MgBr_2+Cl_2\to MgCl_2+Br_2 $
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