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Find Out the correct pair. (a)  CrO^-4 and Cr2O^2-7

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Find Out the correct pair.

(a)  CrO-4 and Cr2O2-7

(b)  MnO-4 and MnO42-

(c) H2CrO4 and HMnO4

(d) Cr2O3 and Mn2O7

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(a)  CrO-4 and Cr2O2-7

In this pair Cr has +6 oxidation states whereas in others the metal has different oxidation state.

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