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?

JEE Main 2016 Chemistry question

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Gold numbers of some colloids are Gelatin: , Gum Arabic: , Oleate: , Starch: . Which among the following is a better protective colloid?

(1)GelatinCorrect
(2)Starch
(3)Oleate
(4)Gum Arabic

Answer: (1)

Solution

The gold number is defined as the minimum mass, in milligrams, of a lyophilic colloid that must be added to 10 mL of a standard gold sol to just prevent its coagulation when 1 mL of 10% sodium chloride is added. A **smaller** gold number means less of the substance is needed, so the

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Question ID VK-115631