Embibe Experts Solutions for Chapter: Redox Reactions, Exercise 1: KCET (UG) 2018

Which of the following is not true for oxidation?

In the reaction of gold with aquaregia, oxidation state of Nitrogen changes from

The oxidation number of nitrogen atoms in ${\mathrm{NH}}_4, {\mathrm{NO}}_3$ are

For the redox reaction

${\mathrm{xMnO}}_4^{-}+{\mathrm{yH}}_2{\mathrm{C}}_2{\mathrm{O}}_4+{\mathrm{zH}}^{+}\to {\mathrm{mMn}}^{2+}+{\mathrm{nCO}}_2+{\mathrm{pH}}_2\mathrm{O}$

The number of moles of electron required to reduce $0.2$ mole of ${\mathrm{Cr}}_2{\mathrm{O}}_7^{-2}$ to ${\mathrm{Cr}}^{+3}$