a) Which of the following oxidation state is not shown by Maganese? (March – 2016) a) +1 b) +2 c) +4 d ) +7

Question

a) Which of the following oxidation state is not shown by Maganese? 

a) +1

b) +2

c) +4

d ) +7

b) Represent the structure of dichromate ion.

c) Potassium permanganate (KMnO₄) is a strong oxidizing agent. Write any two oxidizing reactions of KMnO₄.

Answer 1

a) +1

c) 1. Permanganate ion oxidises iodide to iodine in acid medium:

10I⁺+2MnO₄+16H⁺→2Mn²⁺+8H₂O+5I₂

2. Permanganate ion oxidises Fe²⁺ ion (green) to Fe³⁺ ion (yellow) in acid medium:

5Fe²⁺+MnO₄+8H⁺→Mn²⁺+4H₂O+5Fe³⁺