On addition of 1 ml solution of 10% NaCl to 10 ml of gold sol in the presence of 0.025g of starch the coagulation is just prevented. The gold number of starch is (A) 0.025 (B) 0.25 (C) 2.5 (D) 25

I want solution

Dear Student,

0.025 g of starch needed to prevent coagulation of 1 ml of 10 % NaCl to 10 ml gold sol. 
Amount of starch = 0.025 g = 25 mg
So, gold number of starch = 25
Correct option is D.

Regards
 

  • 23
jh
  • -9
What are you looking for?