Question

For the redox reaction, $ MnO_{4}^{-}+{{C}_{2}}O_{4}^{2-}+{{H}^{+}}\xrightarrow[{}]{{}}M{{n}^{2+}}+C{{O}_{2}}+{{H}_{2}}O $ the correct coefficient of the reactants for the balanced reaction are $ MnO_{4}^{-} $ $ {{C}_{2}}O_{4}^{2-} $ $ {{H}^{+}} $

• A. 2 5 16
• B. 16 5 2
• C. 5 16 2
• D. 2 16 5

Answer 1

Answer: (A)

Oxidation reaction $ {{C}_{2}}O_{4}^{2-}\xrightarrow[{}]{{}}2C{{O}_{2}}+2{{e}^{-}}]\times 5 $ Reduction reaction $ MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\xrightarrow[{}]{{}}M{{n}^{2+}}+8{{H}_{2}}O]\times 2 $ Net reaction $ =2MnO_{4}^{-}+16{{H}^{+}}+5{{C}_{2}}O_{4}^{2-}\xrightarrow[{}]{{}}2M{{n}^{2+}} $ $ +10C{{O}_{2}}+8{{H}_{2}}O $