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6 September, 11:34

Which of the following is an oxidation-reduction reaction? Which of the following is an oxidation-reduction reaction? Ba (C2H3O2) 2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2 (aq) Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2 (aq) HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq) AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3 (aq) H2CO3 (aq) + Ca (NO3) 2 (aq) → 2HNO3 (aq) + CaCO3 (s)

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  1. 6 September, 14:39
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    The only oxidation - reduction reaction is Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2

    Explanation:

    An oxidation-reduction reaction is a chemical reaction that involves an electron transfer between two species. This will lead to a change in oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

    Some atoms have different possible oxidation numbers.

    H has oxidation number + 1

    O has oxidation number - 2

    The oxidation number of an individual atom is 0.

    The total oxidation number of all atoms in: a neutral species is 0 and in an ion is equal to the ion charge.

    ⇒ Ba (C2H3O2) 2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaC2H3O2

    (C2H3O2) 2 has an oxidation number of - 2. So Ba has an oxidation number of + 2

    In BaSO4 has SO4 an oxidation number of - 2 and Ba has an oxidation number of + 2

    This means Ba doesn't change its oxidation number.

    In Na2SO4 Na has an oxidation of + 1; in NaC2H3O2 Na has an oxidation of + 1

    This means Na doesn't change its oxidation number.

    ⇒ Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2

    Cu has an oxidation number of 0

    In Cu (NO3) 2, NO3 has an oxidation number of - 1 so Cu has an oxidation number of + 2

    In 2AgNO3, NO3 has an oxidation number of - 1 so Ag has an oxidation number of + 1

    Ag has an oxidation number of 0

    ⇒ HCl (aq) + NaOH (aq) → H2O (l) + NaCl

    The oxidation number of Cl and Na do not change

    ⇒ AgNO3 (aq) + HCl (aq) → AgCl (s) + HNO3

    In AgNO3 Ag has an oxidation number of + 1

    In AgCl Ag has an oxidation number of + 1

    In HCl Cl has an oxidation number of - 1

    In AgCl Cl has an oxidation number of + 1

    The oxidation number of Cl and Ag do not change

    ⇒ H2CO3 (aq) + Ca (NO3) 2 (aq) → 2HNO3 (aq) + CaCO3 (s)

    In Ca (NO3) 2 Ca has an oxidation number of + 2

    In CaCO3 Ca has an oxidation number of + 2

    In Ca (NO3) 2 N has an oxidation number of + 5

    In HNO3 N has an oxidation number of + 5

    In H2CO3 C has an oxidation number of + 4

    In CaCO3 C has an oxidation number of + 4

    The only oxidation - reduction reaction is Cu (s) + 2AgNO3 (aq) → 2Ag (s) + Cu (NO3) 2

    Oxidizing agent: Ag; Reducing agent: Cu
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