On addition of \( 1 \mathrm{~mL} \) of \( 10 \% \mathrm{NaCl} \) solution to \( 10 \mathrm{~mL} ...

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On addition of \( 1 \mathrm{~mL} \) of \( 10 \% \mathrm{NaCl} \) solution to \( 10 \mathrm{~mL} \) gold sol in presence of \( 0.025 \mathrm{~g} \) of starch,
\( \mathrm{P} \) the coagulation is just prevented. The gold number of starch is :-
(1) 25
(2) \( 2.5 \)
(3) \( 0.25 \)
(4) \( 0.025 \)
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