JEE Main 2016 (Online) 10th April Morning Slot | Surface Chemistry Question 102 | Chemistry

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 these is a better protective colloid ?

Gelatin

Gum Arabic

Oleate

Starch

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

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Out of Syllabus

The most appropriate method of making egg-albumin sol is :

Break an egg carefully and transfer the transparent part of the content to 100 mL of 5% w/V saline solution and stir well

Break an egg carefully and transfer only the yellow part of the content to 100 mL of 5% w/V saline solution and stir well.

Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the white part of the content to 100 mL of 5% w/V saline solution and homogenize with a mechanical shaker.

Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the yellow part of the content to 100 mL of 5% w/V saline solutionand homogenize with a mechanical shaker.

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

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Out of Syllabus

A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

Enthalpy of adsorption is greater than 100 kJ mol⁻¹.

Energy of activation is low.

Adsorption is monolayer.

Adsorption increases with increase in temperature.

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

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Out of Syllabus

For a linear plot of log (x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct ? (k and n are constants)

Both k and 1/n appear in the slope term.

1/n appears as the intercept.

Only 1/n appears as the slope

log (1/n) appears as the intercept.

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