Question

Which one of the following is paramagnetic in nature?
(1) Ni(CO),
(2) [Ni(CN),
(3) K [Fe(CN),
(4) [FeFall​

Answer 1

Answer:

PThe correct answer is 4

Answer 2

Answer:

K3 [ Fe (CN)6] is paramagnetic in nature. So option 3 is correct.

Explanation:

• The formula of potassium ferricyanide is K3[Fe(CN)6]. Now, we have to calculate the oxidation state of K3[Fe(CN)6].

• We know that the oxidation state of potassium is +1 and cyanide is -1. Let’s take x as the oxidation state of Fe.

                x−6=−3

                 ⇒x=3

So, the oxidation state of Fe is +3.

• As CN is a strong field ligand. So, it causes the pairing of electrons. As one electron is not paired, so potassium ferricyanide is paramagnetic in nature.

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