JEE Main 2022 · 25 Jun · Shift 2 · Chemistry Q87

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ChemistryInteger+4 / -1Question 87 of 90

Amongst $\mathrm{FeCl_3\cdot3H_2O}$ , $\mathrm{K_3[Fe(CN)_6]}$ and $\mathrm{[Co(NH_3)_6]Cl_3}$ , the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wavelength is ______ B.M. [nearest integer]

Your answer

Answer and worked solution

Official answer: 2

Inner-orbital complexes. $\mathrm{K_3[Fe(CN)_6]}$ (low-spin $d^5$ ) and $\mathrm{[Co(NH_3)_6]Cl_3}$ (low-spin $d^6$ ).

Shortest wavelength means the largest $\Delta_o$ : the cyanide complex. Its one unpaired electron gives $\mu=\sqrt3\approx1.73\approx2$ BM.

Answer: 2

Topics:Crystal field theory Magnetic properties and colour

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JEE Main 2022 · 25 Jun · Shift 2, Chemistry question 87