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Q.

At the cathodic reaction of dry cell (Leclanche cell). Manganese is reduced from +x oxidation state to  +y oxidation state. Then the sum of  x+y is__________

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answer is 7.

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Detailed Solution

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At cathode  M+4nO2+NH4++e−→ M+3nO(OH)+NH3

x=+4                                     y=+3           

 

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