JEE Main 2016ChemistrySurface ChemistryMediumMCQ

JEE Main 2016 — Surface Chemistry Question with Solution

JEE Main 2016 (10 Apr Online)

Question

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?

Choose an option

Show full solutionCorrect option: A
Correct answer
AGelatin

Step-by-step explanation

Gold number ∝1protective power

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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About this question

This is a previous-year question from JEE Main 2016, covering the Surface Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.