A) \[{{({{S}_{2}}{{O}_{7}})}^{2-}}\]
B) \[{{({{S}_{2}}{{O}_{8}})}^{2-}}\]
C) \[Cr{{O}_{5}}\]
D) \[Ba{{O}_{2}}\]
Correct Answer: A
Solution :
(a)
(b)
(c)
(d)
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