MCQ
Which of the following Compounds has peroxide linkage ?
- A${S_2}O_3^{ - 2}$
- ✓${S_2}O_8^{ - 2}$
- C${S_2}O_5^{ - 2}$
- D${S_2}O_7^{ - 2}$

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$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$
