Answer:
(a)
\[\frac{\overset{+3}{\mathop{CrO_{2}^{-}}}\,\,\,\,\overset{+5}{\mathop{ClO_{3}^{-}}}\,\,\,\,\overset{+6}{\mathop{CrO_{4}^{2-}}}\,\,\,\,\overset{+7}{\mathop{MnO_{4}^{-}}}\,}{Increasing\text{
}oxidation\text{ }state\text{ }of\text{ }central\text{ }atom}\]9.
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