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What is Gold number ?...

What is Gold number ?

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The number of milligrams of a protective colloid required to prevent the coagulation of 10 ml Gold sol when 1 ml of 10% NaCl solution is added is called Gold number.
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What are protective colloids ? Define and explain gold number .

The gold number of some colloids are given below {:("Colloid ","Gold number "),(A,0.01),(B,2.5),(C,20):} The protective nature of these colloids follows the order