d and f BLOCK ELEMENTS

In the reaction MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O, what happens to the oxidation state of manganese?

• It decreases
• It increases
• It stays the same
• It becomes zero

In the permanganate ion (MnO₄⁻), how many oxygen atoms are directly bonded to the central manganese atom?

• 4
• 3
• 2
• 1

What is the primary driving force for the decomposition of KMnO₄ upon heating?

• Thermal energy
• Light energy
• Electrical energy
• Chemical energy

Which of the following best describes the solubility of KMnO₄ in water at room temperature (293 K)?

• Moderately soluble
• Highly soluble
• Insoluble
• Slightly soluble

What is the main reason for the intense color of KMnO₄ solutions?

• Charge transfer transitions
• d-d electronic transitions
• Ion-dipole interactions
• Hydrogen bonding