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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Definitions:

Amygdala

A structure located near the base of the brain that is believed to play a role in emotion, especially negative emotions such as anger and fear.

Interneurons

Interneurons are neurons that connect sensory and motor neurons, enabling communication within the central nervous system.

Afferent Nerves

Nerves that carry sensory signals from organs and tissues in the body to the brain or spinal cord.

Efferent Nerves

Nerves that carry signals away from the central nervous system to effectors such as muscles and glands, essentially facilitating action and response.