JEE Main 2022 · 25 Jul · Shift 1 · Chemistry Q87

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ChemistryInteger+4 / -1Question 87 of 90

Among $\mathrm{Co^{3+}}$ , $\mathrm{Ti^{2+}}$ , $\mathrm{V^{2+}}$ and $\mathrm{Cr^{2+}}$ ions, one if used as a reagent cannot liberate $\mathrm{H_2}$ from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is ______ B.M. (Nearest integer)

Your answer

Answer and worked solution

Official answer: 5

$\mathrm{Co^{3+}}$ is an oxidant and cannot liberate $\mathrm{H_2}$ . As a free ion it is $d^6$ with 4 unpaired electrons: $\sqrt{24}\approx4.9$ , i.e. 5.

Answer: 5

Topics:Transition element properties Magnetic properties and colour

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JEE Main 2022 · 25 Jul · Shift 1, Chemistry question 87