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23 June, 21:28

Which two reactions are redox reactions?

synthesis and decomposition

combustion and synthesis

combustion and single-replacement

single-replacement and double-replacement

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  1. 23 June, 22:23
    0
    Combustion and single replacement.

    Explanation:

    The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

    Oxidation:

    Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

    Reduction:

    Reduction involve the gain of electron and oxidation number is decreased.

    The combustion and single replacement reactions are always redox.

    Consider the following reactions.

    Mg + CuSO₄ → Cu + MgSO₄

    the oxidation state of copper is changed from + 2 to 0 so copper get reduced.

    the oxidation state of Mg is changed from 0 to + 2 so it get oxidized.
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