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Which of the following is not a redox reaction ?

  • A.\(\mathrm{CuO + H_{2} \rightarrow Cu + H_{2}O}\)
  • B.\(\mathrm{Fe_{2}O_{3} + 3CO \rightarrow 2Fe + 3CO_{2}}\)
  • C.\(\mathrm{2K + F_{2} \rightarrow 2KF}\)
  • D.\(\mathrm{BaCl_{2} + H_{2}SO_{4} \rightarrow BaSO_{4} + 2HCl}\)

Answer: D

The reaction that is not a redox reaction is BaCl2 + H2SO4 → BaSO4 + 2HCl.

It is a double displacement (precipitation) reaction: barium stays +2, chlorine -1, sulfur +6, oxygen -2 and hydrogen +1 on both sides. No oxidation numbers change.

The others are redox reactions. In CuO + H2, copper is reduced from +2 to 0 and hydrogen oxidised from 0 to +1. In Fe2O3 + 3CO, iron goes from +3 to 0 and carbon from +2 to +4. In 2K + F2, potassium is oxidised from 0 to +1 and fluorine reduced from 0 to -1.

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