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4 September, 14:17

Which of the following reactions are redox reactions?

A) 4Li (s) + O2 (g) →2Li2O (s)

B) Mg (s) + Fe2 + (aq) →Mg2 + (aq) + Fe (s)

C) Pb (NO3) 2 (aq) + Na2SO4 (aq) →PbSO4 (s) + 2NaNO3 (aq)

D) HBr (aq) + KOH (aq) →H2O (l) + KBr (aq)

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  1. 4 September, 14:35
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    B) Mg (s) + Fe2 + (aq) →Mg2 + (aq) + Fe (s) is redox reaction.

    Explanation:

    A Redox reaction is a reaction in which two simultaneous effects occur, the oxidation of a reducing agent and the reduction of an oxidizing agent.

    The oxidizing agent is that chemical element that tends to capture these electrons, leaving a state of oxidation lower than it had, suffering a reduction.

    The reducing agent is that chemical element that supplies electrons to the medium, increases its oxidation state, that is, it oxidizes.

    because:

    A) 4Li (s) + O2 (g) →2Li2O (s) is a combination reaction

    B) Mg (s) + Fe2 + (aq) →Mg2 + (aq) + Fe (s) is a redox reaction

    C) Pb (NO3) 2 (aq) + Na2SO4 (aq) →PbSO4 (s) + 2NaNO3 (aq) is a Ion-exchange reaction

    D) HBr (aq) + KOH (aq) →H2O (l) + KBr (aq) is an acid-base reaction
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