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The \( \mathrm{K}_{\mathrm{sp}} \) of \( \mathrm{Ag}_{2} \mathrm{CrO}_{4}=1.2 \times 10^{-11} \).
\( \mathrm{P} \) What concentration of \( \mathrm{Ag}^{+} \)ion in aqueous solution

W will just fail to give a precipitate of \( \mathrm{Ag}_{2} \mathrm{CrO}_{4} \) with a solution in which \( \left[\mathrm{CrO}_{4}^{-2}\right]=3 \times 10^{-4} \mathrm{M} \) ?
(1) \( 10^{-3} \mathrm{M} \)
(2) \( 10^{-1} \mathrm{M} \)
(3) \( 10^{-4} \mathrm{M} \)
(4) \( 2 \times 10^{-4} \mathrm{M} \)
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