1. Tardigrade
  2. Question
  3. Chemistry
  4. The coagulation of 100 mL of colloidal solution of gold is completely prevented by addition of 0.25 g of a substance X to it before addition of 1 mL of 10 % NaCl solution. The gold number of X is

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Q. The coagulation of $100 \,mL$ of colloidal solution of gold is completely prevented by addition of $0.25\, g$ of a substance $X$ to it before addition of $1 \,mL$ of $10 \% \,NaCl$ solution. The gold number of $X$ is

Surface Chemistry

Solution:

Number of milligrams of protective colloid added in $10\, mL$ of colloidal gold to prevent its coagulation on addition of $1 \, mL$ of $10 \% NaCl$ solution is called its gold number.
$\therefore $ Gold number of present colloid $=25$