d and f BLOCK ELEMENTS

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

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

What is the main product formed when potassium permanganate is heated strongly?

• Oxygen gas
• Hydrogen gas
• Nitrogen gas
• Carbon dioxide

What gas is evolved when potassium permanganate is heated according to its decomposition reaction?

• Oxygen
• Hydrogen
• Nitrogen
• Carbon dioxide

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

• Solution changes from colorless to persistent pink/purple
• Solution changes from purple to colorless
• Solution turns brown
• Gas bubbles form

What is the main product formed when potassium permanganate oxidizes nitrite ions in acidic solution?

• Nitrate ions
• Nitrogen gas
• Nitric oxide
• Ammonium ions