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Chemistry
The cathode reaction in the dry cell will be
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Q. The cathode reaction in the dry cell will be
COMEDK
COMEDK 2015
Electrochemistry
A
$ Zn_{(s)} \rightarrow Zn^{2+} + 2e^- $
22%
B
$ MnO_2 + NH^+_4 + e^- \rightarrow MnO(OH) + NH_3$
39%
C
$ Zn(Hg) + 2OH^- \rightarrow ZnO_{(s)} + H_2O + 2e^-$
17%
D
$MnO(OH) + NH_3^ - \rightarrow MnO_2 + NH^+_4 + 2e^- $
22%
Solution:
Correct answer is (b) $ MnO_2 + NH^+_4 + e^- \rightarrow MnO(OH) + NH_3$