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On adding \( \mathrm{AgNO}_{3} \) solution into KI solution, a
P negatively charged colloidal sol is obtained when

W they are mixed as
(1) \( 100 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{AgNO}_{3}+100 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \) \( \mathrm{KI} \)
(2) \( 100 \mathrm{~mL} \) of \( 0.1 \mathrm{MAgNO}_{3}+50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \) \( \mathrm{KI} \)
(3) \( 200 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{AgNO}_{3}+200 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \) \( \mathrm{KI} \)
(4) \( 100 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{AgNO}_{3}+100 \mathrm{~mL} \) of 0.15 \( \mathrm{M} \mathrm{KI} \)
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