Reagarding dry cell, the incorrect statement is

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It is a primary cell

Zinc electrode is negative electrode

Oxidation state of “Mn” changes from “+3” to “+2” in cathodic reaction

Tetraammine Zinc (II) complex is formed

answer is C.

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Detailed Solution

At cathode (positive electrode) M+4nO2+NH4++e−→M+3nOOH+NH3 .At anode( negative electrode)Zn→Zn2++2e-Zn+2 combines with NH3 to form ZnNH34+2

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