COMEDK Exam 2015 Solved Paper

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Question : 85 of 180

Marks: +1, -0

The cathode reaction in the dry cell will be

Zn(s)→Zn2++2e−
MnO2+NH4++e−→MnO(OH)+NH3
Zn(Hg)+2OH−→ZnO(s)+H2O+2e−
MnO(OH)+NH3→MnO2+NH4++2e−

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