redox titration

Which of the following is not an oxidising agent?

• potassium permanganate

• Oxalic acid

• potassium dichromate

• potassium iodate

Why KMnO₄ is not a primary standard?Tick the suitable options

• Not available in high purity form

• hygroscopic

• Its aqueous solution decomposes on standing as it is reduced by traces of organic matter.

• Decomposes on exposure to sunlight

• All of the above

Name the acid used in permanganometric titration.

• dil sulphuric acid

• dil hydrochloric acid

• dil. nitric acid

Why oxalic acid solution is warmed along with dilute H₂SO₄ in permanganometric titration.

• to trigger the reaction

• Heating removes all dissolved CO₂ out of the solution driving the reaction in forward direction

• removes the catalyst Mn²⁺ produced and hence smoothen the further titration

• All of the above

What is the stoichiometric ratio in titration of K₂Cr₂O₇ vs Fe²⁺

• 1/6

• 6/1

• 1/5

• 5/1

Select the external indicator used in dichrometry.

• N-phenyl anthranilic acid

• Sodium diphenylamine sulphonate

• Potassium ferrocyanide

• Potassium ferricyanide

The direct titration of a reducing agent with a standard solution of iodine is called iodimetry.

• True

• False

Select the commonly used reducing agents in iodimetry

• hypo

• arsenious oxide

• sodium sulpahate

• sodium arsenite

The choice of the indicator is such that E_In⁰ is closer to the E^o at the equivalence point of titration

• True

• False

Select the redox indicators and its colour change .

• N-phenyl anthranilic acid, Violet red to colurless

• Mureoxide ,red to colurless

• Diphenyl amine ,blue to colourless

• Diphenyl amine,violet to colourless