JEE Main 2017 (Offline) | Surface Chemistry Question 89 | Chemistry

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

The Tyndall effect is observed only when following conditions are satisfied:
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

(b) and (d)

(a) and (c)

(b) and (c)

(a) and (d)

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

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)

-1

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)

-1

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.

PREVIOUS NEXT