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Which one of the following is not an example of a redox reaction?

Options

  1. AAlCl ₃+3 H ₂ O Al ( OH )₃+3 HCl
  2. B2 NaH 2 Na + H ₂
  3. C4 Fe +3 O ₂ 2 Fe ₂ O ₃
  4. DCuSO ₄+ Zn Cu + ZnSO ₄

Correct answer

A. AlCl ₃+3 H ₂ O Al ( OH )₃+3 HCl

Step-by-step solution

The reaction in which oxidation and reduction takes place simultaneously are known as redox reaction. In reaction (a) there is no change in the oxidation number of any element hence it is not a redox reaction.

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