JEE Main Chemistry question
Not in JEE Main or NEET syllabus
On adding 1 mL of a 10% solution of NaCl to 10 mL of gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. The gold number of starch is
Answer: (D)
Solution
The gold number is the mass, in milligrams, of a protective colloid that must be present in 10 mL of gold sol to just prevent its coagulation when 1 mL of 10% NaCl solution
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