The oxoanion which contains all equivalent $M - O$ bond is:
$(I)$ ${C r O}_{4}^{2 -}$
$(I I)$ ${M n O}_{4}^{-}$
$(I I I)$ ${C r}_{2} O_{7}^{2 -}$

I I I

only

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I, I I, I I I

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I, I I

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I

only

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Solution

The correct option is C $I, I I$
In the chromate ion ${C r O}_{4}^{2 -}$ , all the $C r - O$ bonds are equivalent. They have the same bond length
Similarly in the permanganate ion, ${M n O}_{4}^{-}$ , all the Mn-O bonds are equivalent. They have the same bond length.
But in dichromate ion, ${C r}_{2} O_{7}^{2 -}$ , two types of Cr-O bonds are present. One has bond length of 179 pm and the other has bond length of 163 pm.

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