Question

KMnO₄ oxidises others in acidic medium, Difference between two oxidation states of Mn is x. Neutral FeCl₃ reacts with oxalate ion to form a complex compound having y number of d-electrons. Find x + y.

(1) 5

(2) 10

(3) 6

(4) 8

Answer 1

Correct option is : (2) 10

When KMnO₄ oxidises others in acidic medium difference between the two oxidation states of Mn is 5.

\(\therefore \text{x} = 5\)

Fe is in +3 oxidation state.

\([\text {Fe}(\text{C}_2\text{O}_4)_3]^{3-} \Rightarrow \text{Coloured complex}\)

\(\text{Fe}^{3+} \Rightarrow \text{d}^5 \Rightarrow \text{5 electrons are present in d-orbital }\)

\(\therefore \text{y} = 5\)