. Which statement accurately explains the reaction below?Cr2O72-(aq) + S2-(aq) → Cr3+(aq) + S(s)Chromium is oxidized from a +7 oxidation state to a +3 oxidation state.Chromium is reduced from a +7 oxidation state to a +3 oxidation state.Chromium is oxidized from a +6 oxidation state to a +3 oxidation state.Chromium is reduced from a +6 oxidation state to a +3 oxidation state.
Question
. Which statement accurately explains the reaction below?Cr2O72-(aq) + S2-(aq) → Cr3+(aq) + S(s)Chromium is oxidized from a +7 oxidation state to a +3 oxidation state.Chromium is reduced from a +7 oxidation state to a +3 oxidation state.Chromium is oxidized from a +6 oxidation state to a +3 oxidation state.Chromium is reduced from a +6 oxidation state to a +3 oxidation state.
Solution
The correct statement is: "Chromium is reduced from a +7 oxidation state to a +3 oxidation state."
Here's the step-by-step explanation:
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Identify the oxidation states of the elements in the reaction. In Cr2O72-, the oxidation state of Cr is +6. In S2-, the oxidation state of S is -2. In Cr3+, the oxidation state of Cr is +3. In S(s), the oxidation state of S is 0.
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Compare the initial and final oxidation states of the elements. The oxidation state of Cr changes from +6 to +3, which means it gains electrons. The gain of electrons is a reduction process. Therefore, Cr is reduced in this reaction.
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The oxidation state of S changes from -2 to 0, which means it loses electrons. The loss of electrons is an oxidation process. Therefore, S is oxidized in this reaction.
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Therefore, the correct statement is: "Chromium is reduced from a +7 oxidation state to a +3 oxidation state."
Similar Questions
What is the oxidation state change for the chromium in the following reaction14 H+ + Cr2O72- + 3 Zn → 3 Zn2+ + 2 Cr3+ + 7 H2OQuestion 5Select one:a.from +14 to +6b.from +7 to +3c.From +6 to +3d.from -2 to +3e.from +12 to +3
State the oxidation state of Chromium(Cr) in Cr2O3
What is the oxidation number of chromium in the Cr2O72- ion?Question 6Select one:a.+3b.+12c.+7d.+6e.+14
. Which statement accurately explains the reaction below?Fe2+(aq) + MnO4-(aq) → Fe3+(aq) + Mn2+(aq)Manganese is oxidized from a +7 oxidation state to a +2 oxidation state.Manganese is reduced from a +7 oxidation state to a +2 oxidation state.Manganese is oxidized from a +4 oxidation state to a +2 oxidation state.Manganese is reduced from a +4 oxidation state to a +2 oxidation state.
. H2O2 changes Cr2O72- ion to CrO5 in an acidic medium, the oxidation state of Cr in CrO5 is(a) +6(b) +5(c) -10(d) +3Answer: (a)
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