Which of the following represents redox reactions? I. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+2…

Which of the following represents redox reactions?
I. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+2 \overline{\mathrm{O}} \mathrm{H} \longrightarrow 2 \mathrm{Cr}_{4}^{2-}+\mathrm{H}_{2} \mathrm{O}$
II. $\mathrm{Zn}+\mathrm{CuSO}_{4} \longrightarrow \mathrm{ZnSO}_{4}+\mathrm{Cu}$
III. $2 \mathrm{MnO}_{4}^{-}+3 \mathrm{Mn}^{2+}+4 \overline{\mathrm{O}} \mathrm{H} \longrightarrow$
$5 \mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$
IV. $\quad 2 \mathrm{Cu}^{+} \longrightarrow \mathrm{Cu}+\mathrm{Cu}^{2+}$
  1. I,II
  2. I, III
  3. III, IV
  4. II, III,IV

Solution

II, III and IV are redox reactions.

Asked in: JEE-TOPICTESTS-CHEMISTRY

Practice more REDOX REACTIONS questions on Aicharya