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MnO2,H2S2O8,KMnO4 व CH2Cl2 में क्रमशः Mn...

`MnO_2,H_2S_2O_8`,KMnO_4` व `CH_2Cl_2` में क्रमशः Mn , S, Mn व C के ऑक्सीकरण अंक लिखिए।

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Which of the following reactions are disproportionation reactions ? (i) Cu^(+) to Cu^(2+) + Cu (ii) 3MnO_4^(2-) + 4H^(+ ) to 2MnO_4^(-) + MnO_2 + 2H_2O (iii) 2KMnO_4 to K_2 MnO_4 + MnO_2 + O_2 (iv) 2MnO_4^(-) + 3Mn^(2+) + 2H_2O to 5MnO_2 + 4H^+

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Which of the following reactions are disproportionation reactions ? (i) Cu^(+) rarr Cu^(2+)+ Cu (ii) 3MnO_4^(2-)+ 4H^(+) rarr 2MnO_4^(-)+ MnO_2 + 2H_2O (iii) 2KMnO_4 rarr K_2MnO_4 +MnO_2 + O_2 (iv) 2MnO_4^(-)+ 3Mn^(2+)+ 2H_2O rarr 5MnO_2 +4H^(+)