The cause of a redox reaction is the:

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Accepted Answer

Step-by-step explanation:

1. Definition: A redox (reduction-oxidation) reaction involves changes in oxidation states of species due to electron movement.
2. Electron transfer: Oxidation is loss of electrons and reduction is gain of electrons — e.g. A → A^{n+} + n e^{-} (oxidation) and B + n e^{-} → B^{n-} (reduction). The overall process is transfer of electrons between reactants.
3. Why other options are wrong:
   - (2) Transfer between products: electron transfer occurs during the reaction between reactants, not between final products.
   - (3) Neutrons are not transferred in chemical reactions; neutron transfer relates to nuclear reactions, not redox chemistry.
   - (4) Exchange of halogens is a specific type of substitution or displacement and is not the general cause of redox unless it involves electron transfer.

Therefore the correct cause is the transfer of electrons between two reactants (option (1)).

FINAL_ANSWER: a

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