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Q. For the redox reaction,
$Zn + NO _{3}^{-} \longrightarrow Zn ^{2+}+ NH _{4}^{+}$
in basic medium, coefficients of $Zn , NO _{3}^{-}$, and $OH ^{-}$in the balanced equation respectively, are

ManipalManipal 2009Redox Reactions

Solution:

$4 Zn + NO _{3}^{-}+7 H _{2} O \longrightarrow 4 Zn ^{2+} + NH _{4}^{+}+10OH ^{-}$