EJU Japan · EJU Chemistry

Oxidation and Reduction

7 practice questions, each with the answer and an explanation.

Practise Oxidation and Reduction now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

In an acidic solution, 20 mL of 0.1 mol/L Fe $^{2 +}$ is titrated with 0.04 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In an acidic solution, 25 mL of 0.02 mol/L Fe $^{2 +}$ is titrated with 0.01 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In an acidic solution, 10 mL of 0.04 mol/L Fe $^{2 +}$ is titrated with 0.01 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In an acidic solution, 10 mL of 0.04 mol/L Fe $^{2 +}$ is titrated with 0.02 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In an acidic solution, 20 mL of 0.04 mol/L Fe $^{2 +}$ is titrated with 0.02 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In an acidic solution, 25 mL of 0.04 mol/L Fe $^{2 +}$ is titrated with 0.02 mol/L KMnO $_{4}$ (MnO $_{4}^{-}$ + 5Fe $^{2 +}$ + 8H $^{+}$ → Mn $^{2 +}$ + 5Fe $^{3 +}$ + 4H $_{2}$ O). What volume of KMnO $_{4}$ is needed?
In the reaction Zn + Cu $^{2 +}$ → Zn $^{2 +}$ + Cu, which species is the reducing agent?