When the concentration of Cl⁻(aq) is increased then the concentration of Ag⁺(aq) decreased.
Equilibrium law tells that if any external stress is applied on the equilibrium state then it will shift towards that side where the stress will reduces.
Given chemical reaction is:
AgCl(s) ⇄ Ag⁺(aq) + Cl⁻(aq)
If the concentration of chloride ion increases then to maintain the change then equilibrium will shift towards the left side as a result of which concentration of silver ions decreases.
Hence, concentration of silver ion decreases.
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