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Give chemical reactions for the following observations: (i) Potassium permanganate is a good oxidising agent in basic medium. (ii) Inter-convertibility of chromate ion and dichromate ion in aqueous solution depends upon pH of the solution . (iii) Potassium permanganate is thermally unstable at 513 K

(a)(i)MnO4+H2O+I2MnO2+2OH+IO3(ii)CrO24+2H+AcidpH<7Cr2O27+H2O(iii)KMnO4Δ513KK2MnO4+MnO2+O2(b)(i)2MnO4+H2O+I2MnO2+2H2O+IO3(ii)2CrO23+2H+AcidpH<7Cr2O27+H2O(iii)2KMnO4Δ513KK2MnO4+MnO2+O2(c)(i)2MnO4+H2O+I2MnO2+2OH+IO3(ii)2CrO24+2H+AcidpH<7Cr2O27+H2O(iii)2KMnO4Δ513KKMnO4+MnO+O2(D)(i)2MnO4+H2O+I2MnO2+2OH+IO3(ii)2CrO24+2H+AcidpH<7Cr2O27+H2O(iii)2KMnO4Δ513KK2MnO4+MnO2+O2</span>

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