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The spin-only...

Question

The spin-only magnetic moment value of $M^{3 +}$ ion (in gaseous state) from the pairs $C r^{3 +} / C r^{2 +}, M n^{3 +} / M n^{2 +}, F e^{3 +} / F e^{2 +} and C o^{3 +} / C o^{2 +}$ that has negative standard electrode potential, is ______B.M. [Nearest integer]

4.00

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4.0

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Solution

Among the pairs given, $C r^{3 +} / C r^{2 +}$ has negative reduction potential which is $- 0.41 V .$ This is because for $C r$ +3 & +6 are more stable oxidation states.
$C r (I I I) \Rightarrow d^{3}$
Number of unpaired electrons $= 3$

$μ = \sqrt{3 (3 + 2)} = \sqrt{15} = 4 B . M$

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