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If the molar concentration of PbI₂ is 1.5×10⁻³ mol L⁻¹ , then the concentration of iodide ions of g ion L⁻¹ is?
A. 3.0×10⁻³
B. 6.0×10⁻³
C. 0.3×10⁻³
D. 0.6×10⁻⁶