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Gold numbers of some colloids are Gelatin: 0 . 005 - 0 . 01 , Gum Arabic: 0 . 15 - 0 . 25 , Oleate: 0 . 04 - 1 . 0 , Starch: 15 - 25 . Which among the following is a better protective colloid?

Options

  1. AGelatin
  2. BStarch
  3. COleate
  4. DGum Arabic

Correct answer

A. Gelatin

Step-by-step solution

G o l d   n u m b e r   ∝ 1 p r o t e c t i v e   p o w e r It is defined as the minimum amount of protective colloid in milligrams which prevents a colour change from red to violet of 10   mL gold solution by the addition of 10   mL of 10   %   NaCl Solution.

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