JEE Main Chemistry question
Not in JEE Main or NEET syllabus
On addition of 1 mL solution of 10% NaCl to 10 mL gold solution in the presence of 0.025 g of starch, the coagulation is prevented because starch has the following gold number
Answer: (A)
Solution
Gold number is defined as the mass, in milligrams, of protective colloid present in the standard 10 mL gold sol that just prevents its coagulation on addition of 1
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