JEE Main 2012 Chemistry question
Not in JEE Main or NEET syllabus
On addition of 1 mL of 10%NaCl solution to 10 mL gold sol in the presence of 0.025 g of starch, the coagulation is just prevented. Starch has gold number
Answer: (2)
Solution
The gold number is the mass in milligrams of protective colloid that just prevents
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