QJEEM23Ch0d1a: JEE Main 2023 Chemistry - Class 12 JEEM23Ch0d1a Solution: Given below are two statements, one is labelled as Assertion A…

Question

Verified Solution • 2025–26 Session moderate

Given below are two statements, one is labelled as Assertion $A$ and the other is labelled as Reason $R$ .

Assertion A: The spin only magnetic moment value for ${[Fe (CN)_{6}]}^{3 -}$ is $1.74 BM$ , whereas for ${[Fe {(H_{2} O)}_{6}]}^{3 +}$ is $5.92 BM$ .

Reason $R$ : In both complexes, $Fe$ is present in +3 oxidation state.

In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Unpaired electron

=1

μ = \sqrt{n (n + 2)} = \sqrt{1 \times 3} = 1.74 B.M.

\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}

No pairing because

\mathrm{H}_2 \mathrm{O}

is WFL

Number of unpaired electrons

=5, \mu=5.92 \mathrm{BM}

Assertion is true, Reason is true but not correct explanation.

Step-by-Step Verified Solution