If the gold number of potato starch is 25, how many grams of it is required to prevent coagulation of 100mL of gold sol on adding 10mL of 10% NaCl solution ?

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0.30

0.50

0.25

0.40

answer is C.

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Detailed Solution

The minimum no.of milligrams of protective colloid required to prevent the coagulation

of 10ml of gold sol by the addition of 1ml of 10% NaCl is called gold no.

$Gold number\;\propto\;\frac{1}{protective power}$

10ml of gold sol requires ---- 25 mg of starch

100ml of gold sol requires ---- ?

= 250mg of starch(or) 0.25grams of starch

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