d and f BLOCK ELEMENTS

What observable change occurs when acidified KMnO₄ is added to a solution containing Fe²⁺ ions?

• Color changes from purple to colorless/yellow
• Color changes from colorless to purple
• Precipitation occurs
• Gas evolution

What is the main oxidizing agent in the laboratory preparation of potassium permanganate from Mn²⁺?

• Peroxodisulphate
• Permanganate
• Nitric acid
• Hydrogen peroxide

What is the main product of the reaction between acidified potassium permanganate and iron(II) sulfate?

• Iron(III) sulfate
• Iron(II) sulfate
• Iron metal
• Iron(II) oxide

What compound is formed when potassium permanganate crystals decompose upon heating, besides oxygen and manganese dioxide?

• Potassium manganate
• Potassium oxide
• Potassium hydroxide
• Manganese metal

What is the main reason potassium permanganate is considered a strong oxidizing agent in acidic solutions?

• High positive reduction potential
• Its intense purple color
• Its low solubility
• Its tetrahedral structure