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NEETChemistryChemical Equilibrium

Aqueous solution of ferric nitrate when mixed with aqueous solution of potassium thiocyanate gives red colour solution. The intensity of red colour becomes constant on attaining equilibrium. Choose the correct statement when the following chemical is added to the above solution at equilibrium. I. Oxalic acid II. Mercuric chloride

Options

  1. ABoth (I) and (II) will decrease the intensity of red colour.
  2. BBoth (I) and (II) will increase the intensity of red colour.
  3. C(I) will increase but (II) will decrease the intensity of red colour.
  4. D(I) will decrease but (II) will increase the intensity of red colour.

Correct answer

A. Both (I) and (II) will decrease the intensity of red colour.

Step-by-step solution

When ferric nitrate is mixed with aqueous solution of potassium thiocyanate, i.e. (KSCN). The intensity of red colour becomes constant on attaining equilibrium. When, (I) oxalic acid, i.e. ( C ₂ H ₂ O ₄ ) or (II) mercuric chloride, i.e. ( HgCl ₂ ) is added at equilibrium. Both (I) and (II) will decrease the intensity of red colour. Due to formation of complex.

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