Which of the following changes takes place at | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) In a dry cell (Leclanch&eacute; cell),the anode is the zinc container,where oxidation occurs: $Zn_{(s)} \rightarrow Zn^{2+}_{(aq)} + 2e^-$.
The c

Vedclass · Accepted Answer

$MnO_{2_{(s)}}$ is reduced to $Mn_2O_{3_{(s)}}$

Vedclass · Answer

(C) In a dry cell (Leclanch&eacute; cell),the anode is the zinc container,where oxidation occurs: $Zn_{(s)} ightarrow Zn^{2+}_{(aq)} + 2e^-$.
The cathode (positive electrode) is a graphite rod surrounded by powdered $MnO_2$ and carbon.
At the cathode,the reduction reaction occurs: $MnO_{2	ext{(s)}} + NH_4^+{_{	ext{(aq)}}} + e^{-} ightarrow MnO(OH)_{	ext{(s)}} + NH_{3	ext{(g)}}$.
This reaction involves the reduction of $Mn$ from the $+4$ oxidation state in $MnO_2$ to the $+3$ oxidation state in $MnO(OH)$,which is often represented as $Mn_2O_3$.
Thus,$MnO_{2_{(s)}}$ is reduced to $Mn_2O_{3_{(s)}}$.

Which of the following changes takes place at the positive electrode during the working of a dry cell?

Similar Questions

The $Cu^{+}$ ion is not stable in aqueous solution. For the disproportionation reaction,what is the $E^o$ value in $V$? (Given: $E^o_{Cu^{2+} | Cu^{+}} = 0.15 \, V$; $E^o_{Cu^{2+} | Cu} = 0.34 \, V$)

In $H_2-O_2$ fuel cell,the reaction occurring at the cathode is:

Write a note on lead storage cell (battery).

What is the chemical reaction that occurs during the discharging of a lead storage cell?

Vedclass Test Series

Exam Paper Generator

Online Exam Module