Which of the following is an oxidation-reduction reaction? A) HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l) B) NaI(aq) + AgNO3(aq) →

Question

Which of the following is an oxidation-reduction reaction?
A) HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)
B) NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq)
C) Pb(C2H3O2)2(aq) + 2 LiBr(aq) → PbBr2(s) + 2 LiC2H3O2(aq)
D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)
E) All of the above are oxidation-reduction reactions.

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Euphemia 5 years 2021-08-18T03:23:27+00:00 1 Answers 137 views 0

Answers ( )

  1. vankhanh
    0
    2021-08-18T03:25:15+00:00
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    Answer:

    D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)

    Explanation:

    In a redox reaction, One atom is gaining electrons (Reduction) whereas other is loosing electrons (Oxidation). In the reactions:

    A) HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)

    As sodium is always +1 and Br always -1, this is not a redox reaction.

    B) NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq)

    Sodium is always +1 and nitrate ion is -1. This is not a redox reaction

    C) Pb(C2H3O2)2(aq) + 2 LiBr(aq) → PbBr2(s) + 2 LiC2H3O2(aq)

    Acetate ion, C2H3O2 is -1 as Br is -1, lithium is +1 and Pb +2, This is not a redox reactoin

    D) Ba(s) + 2 HCl(aq) → BaCl2(aq) + H2(g)

    Barium is 0 as Ba(s) but +1 as BaCl2. Is oxidizing

    Hydrogen is +1 as HCl but 0 as H2. Is reducting.

    This reaction is an oxidation-reduction reaction

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )