REDOX TITRATION

Define oxidation and reduction in the context of redox reactions.

• • A) Oxidation is the gain of electrons; reduction is the loss of electrons.

• • B) Oxidation is the loss of electrons; reduction is the gain of electrons.

• • C) Oxidation is the gain of protons; reduction is the loss of protons.

• • D) Oxidation is the loss of protons; reduction is the gain of protons.

• Cerimetry is a redox titration method. What is the cerimetric titration used to determine?

• • A) Concentration of cerium ions

• • B) Concentration of reducing agents

• • C) Concentration of oxidizing agents

• • D) Concentration of transition metals

• Dichrometry is a redox titration technique. What is commonly used as the titrant in dichrometry?

• • A) Potassium dichromate (K2Cr2O7)

• • B) Potassium iodide (KI)

• • C) Sodium thiosulfate (Na2S2O3)

• • D) Bromine (Br2)

In a redox titration, what is the substance that undergoes reduction?

• • A) Oxidizing agent

• • B) Indicator

• • C) Titrant

• • D) Analyte

Which of the following is commonly used as a reducing agent in redox titrations?

• • A) Potassium permanganate (KMnO4)

• • B) Sodium thiosulfate (Na2S2O3)

• • C) Potassium dichromate (K2Cr2O7)

• • D) Hydrochloric acid (HCl)

In a redox titration involving potassium permanganate (KMnO4) as the titrant, what is the color change indicating the endpoint?

• • A) From purple to colorless

• • B) From colorless to pink

• • C) From pink to colorless

• • D) From green to brown

Which indicator is commonly used in a redox titration involving potassium permanganate?

• A) Methyl orange

• B) Phenolphthalein

• C) No indicator is required

• D) Starch solution

1. In a redox titration involving potassium permanganate (KMnO₄) and oxalic acid (H₂C₂O₄), what is the role of KMnO₄?

• • A) Reducing agent

• • B) Oxidizing agent

• • C) Neutralizing agent

• • D) Catalyst

Which of the following is the correct balanced equation for the redox reaction between potassium permanganate and oxalic acid in acidic medium?

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• • A) 2KMnO4+5H2C2O4+6H2SO4→2MnSO4+10CO2+8H2O+K2SO42KMnO4​+5H2​C2​O4​+6H2​SO4​→2MnSO4​+10CO2​+8H2​O+K2​SO4​

• • B) KMnO4+H2C2O4+H2SO4→MnSO4+CO2+H2O+K2SO4KMnO4​+H2​C2​O4​+H2​SO4​→MnSO4​+CO2​+H2​O+K2​SO4​

• • C) KMnO4+H2C2O4+H2SO4→MnO2+CO2+H2O+K2SO4KMnO4​+H2​C2​O4​+H2​SO4​→MnO2​+CO2​+H2​O+K2​SO4​

• • D) 2KMnO4+5H2C2O4+3H2SO4→2MnSO4+10CO2+8H2O+K2SO42KMnO4​+5H2​C2​O4​+3H2​SO4​→2MnSO4​+10CO2​+8H2​O+K2​SO4​

Which of the following is NOT a redox titration method?

• A) Iodometry

• B) Cerimetry

• C) Complexometry

• D) Bromatometry