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AP EAMCET202318 May 2023Evening ShiftChemistryChemical EquilibriumActual

Observe the following equilibrium Fe ³⁺( aq )+ SCN ⁻( aq ) [ Fe ( SCN )]²⁺( aq ) yellow colourless deep red Addition of aqueous oxalic acid solution to the above equilibrium

Options

  1. AShifts the equilibrium towards the formation of [ Fe ( SCN )]²⁺
  2. BDeep red color increases
  3. CIntensity of deep red color decreases
  4. DNo change in equilibrium

Correct answer

C. Intensity of deep red color decreases

Step-by-step solution

Addition of oxalic acid H ₂ C ₂ O ₄ causes the oxalate ions C ₂ O ₄²⁻ to react with Fe ³⁺ ions and form a complex that decreases the concentration of Fe ³⁺ ions. Thus, the equilibrium would shift towards the direction where the concentration of Fe ³⁺ ions would increase which is towards left and this decreases the intensity of deep red colour.

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