Explain the effect of concentration on equilibrium when two drops of $0.2 \ M$ potassium thiocyanate $(KSCN)$ are added to $1 \ mL$ of $0.2 \ M$ iron $(III)$ nitrate solution.

  • A
    $a.$ Equilibrium shifts to the left and the red color intensity decreases.
  • B
    $b.$ Equilibrium shifts to the right and the red color intensity increases.
  • C
    $c.$ Equilibrium remains unchanged.
  • D
    $d.$ Equilibrium shifts to the right and the red color intensity decreases.

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