First slide

Batteries

Question

Reagarding dry cell, the incorrect statement is

Moderate

A

It is a primary cell
B

Zinc electrode is negative electrode
C

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

Tetraammine Zinc (II) complex is formed

Solution

At cathode (positive electrode)
$\overset{+ 4}{M} {nO}_{2} + {NH}_{4}^{+} + \bar{e} \to \overset{+ 3}{M} nO (OH) + {NH}_{3}$ .
At anode( negative electrode)
$Zn \to {Zn}^{2 +} + 2 \bar{e}$
Zn⁺² combines with NH₃ to form ${[Zn {({NH}_{3})}_{4}]}^{+ 2}$

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