The coagulation of 10 cm^ 3 & of Gold sol by 1 ml 10% NaCl solution...

The coagulation of 10 cm^{3}& of Gold sol by 1 ml 10% NaCl solution is completely prevented by addition of 0.25 g of starch to it. The gold number of starch is-

Options

A0.025
B0.25
C2.5
D250

Correct answer

D. 250

Step-by-step solution

0.25 gm prevents coagulation of 10 ml of gold sol by 1 ml of 10% NaCl

∴

milligrams at starch

= 250

∴

Gold number

= 250

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