d and f BLOCK ELEMENTS

Which of the following best describes the magnetic behavior of MnO₄⁻ and MnO₄²⁻ respectively?

• Diamagnetic, Paramagnetic
• Paramagnetic, Diamagnetic
• Both Paramagnetic
• Both Diamagnetic

Why does the permanganate ion have a tetrahedral shape?

• Four oxygen atoms bonded to central Mn
• One lone pair on Mn
• Two double bonds and two single bonds
• Presence of d-orbitals only

What is the oxidation state of Mn in potassium permanganate (KMnO₄)?

• +7
• +6
• +4
• +2

What is the oxidation state of Mn in potassium manganate (K₂MnO₄)?

• +6
• +7
• +4
• +2

Which of the following is a common use of the intense color property of KMnO₄?

• As an indicator in redox titrations
• As a food coloring
• As a pH indicator
• As a solvent