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Cr₃+ (d3) in [Cr(NH₃)6]3+ (octahedral) with moderate field NH₃ has t2g3, so 3 electrons.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
Cr is in 0 oxidation state with 6 CO ligands. EAN = 24 − 0 + 2 × 6 = 36.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Colour and Magnetic Properties and Stability and Importance
Let oxidation state of Cr be x. 2(+1) + 2x + 7(-2) = 0 → x = +6.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
E°cell = 0.80 - (-0.74) = 1.54 V . Ecell = 1.54 - (0.059/3) log ([Cr³⁺]/[Ag⁺]³) = 1.54 - 0.01967 log (0.002/0.000125) = 1.54 - 0.025 = 1.515 V .
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Nernst Equation and Gibbs Energy and Equilibrium Constant
E°cell = E°cathode - E°anode = 0.80 - (-0.74) = 1.54 V .
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Electrochemical Cells - Galvanic Cells and Electrode Potential
Cr (+3 in Cr(OH)3) to +6 in CrO₄²−: change = +6 - (+3) = +3; each Cr loses 3 electrons.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
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