Difficult
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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