Arrange the following ions in the decreasing order of covalent double bonds formed by the transition metal with oxygen.
\[
A. = \text{chromate}, \quad B = \text{permanganate}, \quad C = \text{dichromate}
\]
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The covalent nature of the bond between a transition metal and oxygen increases with the oxidation state of the metal. Higher oxidation states lead to stronger covalent bonds.