JEE Main 2022 · 26 Jun · Shift 1 · Chemistry Q87

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ChemistryInteger+4 / -1Question 87 of 90

The spin-only magnetic moment value of an octahedral complex among $\mathrm{CoCl_3\cdot4NH_3}$ , $\mathrm{NiCl_2\cdot6H_2O}$ and $\mathrm{PtCl_4\cdot2HCl}$ , which upon reaction with excess of $\mathrm{AgNO_3}$ gives 2 moles of AgCl is ______ B.M. (Nearest Integer)

Your answer

Answer and worked solution

Official answer: 3

Two moles of AgCl need two ionisable chlorides: $\mathrm{NiCl_2\cdot6H_2O}=\mathrm{[Ni(H_2O)_6]Cl_2}$ . ( $\mathrm{[Co(NH_3)_4Cl_2]Cl}$ gives 1, $\mathrm{H_2[PtCl_6]}$ gives 0.)

Moment. $\mathrm{Ni^{2+}}$ ( $d^8$ ) has 2 unpaired electrons: $\sqrt8\approx2.83\approx3$ BM.

Answer: 3

Topics:Magnetic properties and colour Nomenclature

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JEE Main 2022 · 26 Jun · Shift 1, Chemistry question 87