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On adding \( \mathrm{AgNO}_{3} \) solution into KI solution, a negatively charged colloidal sol is obtained when they are in:
(a) \( 50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{AgNO}_{3}+50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{KI} \)
(b) \( 50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{AgNO}_{3}+50 \mathrm{~mL} \) of \( 0.2 \mathrm{M} \mathrm{KI} \)
(c) \( 50 \mathrm{~mL} \) of \( 0.2 \mathrm{M} \mathrm{AgNO}_{3}+50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{KI} \)
(d) None of these
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