JEE Main Chemistry question
Not in JEE Main or NEET syllabus
On adding 1 mL of a 10% NaCl solution to 10 mL of a gold sol in the presence of 0.25 g of starch, coagulation is just prevented. The gold number of starch is equal to (in mg).
Answer: 250
Solution
Gold number is reported as the mass of the protective colloid in milligrams. The given mass of starch is $0.25\ g = 0.25 × 1000\ mg = 250\
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