For Redox Titrations,the Oxidation State of the Analyte May Need

question 8

Multiple Choice

For redox titrations,the oxidation state of the analyte may need adjusting.The analyte can be prereduced with a reducing agent to quantitatively reduce the analyte,with the excess reducing agent eliminated to prevent interference with titration.Which of the reducing agents is paired with INCORRECT elimination chemistry?

• A)Stannous chloride in hot HCl is eliminated by the addition of excess HgCl₂,converting stannous cation to stannic cation.
• B)Chromous chloride is eliminated by boiling,converting chromium(II)cation to chromium(III).
• C)Sulfur dioxide is expelled by boiling in acid.
• D)Hydrogen sulfide is expelled by boiling in base.
• E)Excess hydrogen peroxide in acidic solution is eliminated by boiling,converting hydrogen peroxide to water and oxygen gas.

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