The spin-only magnetic moment value of M³⁺ ion (in gaseous state) from the pairs Cr³⁺/Cr²⁺, Mn³⁺/Mn²⁺, Fe³⁺/Fe²⁺ and Co³⁺/Co²⁺ that has negative standard electrode potential, is B.M.

Question

The spin-only magnetic moment value of M³⁺ ion (in gaseous state) from the pairs Cr³⁺/Cr²⁺, Mn³⁺/Mn²⁺, Fe³⁺/Fe²⁺ and Co³⁺/Co²⁺ that has negative standard electrode potential, is  B.M.

Canvas Classes · Accepted Answer

Strategy:
 Use standard electrode potentials () from the typical 3d series trends to identify the specific metal, then calculate its magnetic moment.

Step 1: Identify the metal with negative 
Comparing the  reduction potentials:
- : Negative () because   is a very stable half-filled  state in water, making reduction to  unfavorable.
- , , and  all have positive reduction potentials to +2 state.
Therefore, the metal is Chromium.

Step 2: Calculate the spin-only magnetic moment for 
 has a  confi

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