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  4. Which of the following is not correct for dry cell?

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Q. Which of the following is not correct for dry cell?

Electrochemistry

Solution:

Ammonia produced due to reaction

$MnO _{2}+ NH _{4}^{+}+1 e ^{-} \rightarrow MnO ( OH )+ NH _{3}$

Combines with $Zn ^{+2}$ ions to form

$\left[ Zn \left( NH _{3}\right)_{4}\right]^{2+}$