JEE Main 2022 · 30 Jun · Shift 1 · Chemistry Q86

ChemistryInteger+4 / -1Question 86 of 90

In the following brown complex, the oxidation state of iron is +______.

$\mathrm{[Fe(H_2O)_6]^{2+}+NO\rightarrow\underset{Brown\ complex}{[Fe(H_2O)_5(NO)]^{2+}}+H_2O}$

Your answer

Answer and worked solution

Official answer: 2

Keyed reading. Counting NO as a neutral ligand, iron keeps its +2 state from $\mathrm{[Fe(H_2O)_6]^{2+}}$ .

Note. The usual modern description has NO bound as $\mathrm{NO^+}$ , which would make iron +1; the key takes +2.

Answer: 2

JEE Main 2022 · 30 Jun · Shift 1, Chemistry question 86