d and f BLOCK ELEMENTS

Which of the following is NOT a typical use of potassium permanganate?

• As an oxidant in preparative organic chemistry
• As a bleaching agent for textiles
• As a reducing agent in organic synthesis
• For the decolorization of oils

Why are permanganate titrations generally unsatisfactory in the presence of hydrochloric acid?

• Because HCl neutralizes the permanganate
• Because HCl forms a precipitate with permanganate
• Because hydrochloric acid is oxidized to chlorine
• Because HCl reduces the permanganate too quickly

In neutral or faintly alkaline solutions, what happens to manganous salt in the presence of potassium permanganate and a catalyst like zinc oxide?

• It is reduced to metallic manganese
• It forms a complex ion
• It is oxidized to MnO2
• It remains unchanged

In neutral or faintly alkaline solutions, what is the primary product when thiosulphate ion is oxidized by potassium permanganate?

• Sulphur dioxide
• Sulphur
• Sulphate ion
• Tetrathionate ion

In neutral or faintly alkaline solutions, what is the product of the oxidation of iodide ions by potassium permanganate?

• Iodine
• Iodate ion
• Periodate ion
• Hypoiodite ion