Question

On additon of one ML of 10% NaCI solution of 10ml gold sol in presence of 0.25 gm of starch, the coagulation is just prevented, starch has gold number :
A. `0.025`
B. `0.25`
C. `2.5`
D. `25`

Answer 1

Correct Answer - D
Gold number is minimum amount of protective colloid when can protect `10 ml` standard gold sol from coagulation when `1 ml` of `10%` NaCl is added.