On addition one \( \mathrm{ml} \) solution of \( 10 \% \mathrm{NaCl} \) to 10 ml red gold s...
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0On addition one \( \mathrm{ml} \) solution of \( 10 \% \mathrm{NaCl} \) to 10 ml red gold sol in the presence of \( 0.0025 \mathrm{~g} \) of starch, the coagulation is just prevented. The gold number of starch is
(a) 25
(b) \( 2.5 \)
(c) \( 0.25 \)
(d) \( 0.025 \)
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