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What is the minimum mass of \( \mathrm{NaBr} \) which should
P be added in \( 200 \mathrm{ml} \) of \( 0.0004 \mathrm{MAgNO}_{3} \) solution just

W to start the precipitation of \( \mathrm{AgBr} \) ? The value of \( \mathrm{K}_{\mathrm{sp}} \) of \( \mathrm{AgBr}=4 \times 10^{-13}(\mathrm{Br}=80) \).
(1) \( 1.0 \times 10^{-9} \mathrm{~g} \)
(2) \( 2 \times 10^{-10} \mathrm{~g} \)
(3) \( 2.06 \times 10^{-8} \mathrm{~g} \)
(4) \( 1.03 \times 10^{-7} \mathrm{~g} \)
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