After balancing equation, \(\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{H}^{+}+\mathrm{MnO}_4^{-} \longrightarrow…

After balancing equation, \(\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{H}^{+}+\mathrm{MnO}_4^{-} \longrightarrow \mathrm{CO}_2+\mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}\) The coefficient of \(\mathrm{CO}_2\) is
  1. 4
  2. 5
  3. 10
  4. 2

Solution

\(\begin{aligned} & a \stackrel{+3}{\mathrm{C}_2} \mathrm{O}_4^{2-}+b \stackrel{+7}{\mathrm{M}} \mathrm{O}_4^{-}+\mathrm{H}^{+} \rightarrow p \stackrel{+4}{\mathrm{CO}_2}+q \mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O} \\ & \text {nf }(4-3) \times 2=2(7-2) \times 1=5 \\ & \text {mole: } \quad 5 \\ \end{aligned}\) \(\Rightarrow \quad a=5, b=2\) \(\Rightarrow\) By POAC, for C-atoms: \(2 a=p\) \(p=2 a=2 \times 5=10\) (Here, \(n f: n\)-factor or valency factor)

Asked in: AP EAMCET 2020 (17 Sep Shift 2)

Practice more Redox Reactions questions on Aicharya