JEE Advanced 2023 Paper 2 Online

MCQ (Single Correct Answer)

-1

Consider the following statements related to colloids.

(I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium.

(II) For emulsions, both the dispersed phase and the dispersion medium are liquid.

(III) Micelles are produced by dissolving a surfactant in any solvent at any temperature.

(IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium.

The option with the correct set of statements is :

(I) and (II)

(II) and (III)

(III) and (IV)

(II) and (IV)

JEE Advanced 2013 Paper 1 Offline

MCQ (Single Correct Answer)

-0.75

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25^oC. For this process, the correct statement is

The adsorption requires activation at 25^oC.

The adsorption is accompanied by a decrease in enthalpy

The adsorption increases with increase of temperature

The adsorption is irreversible

IIT-JEE 2009 Paper 1 Offline

MCQ (Single Correct Answer)

-1

Among the electrolytes Na$$_2$$SO$$_4$$, CaCl$$_2$$, Al$$_2$$(SO$$_4$$)$$_3$$ and NH$$_4$$Cl, the most effective coagulating agent for Sb$$_2$$S$$_3$$ sol is

Na$$_2$$SO$$_4$$

CaCl$$_2$$

Al$$_2$$(SO$$_4$$)$$_3$$

NH$$_4$$Cl

IIT-JEE 2008 Paper 2 Offline

MCQ (Single Correct Answer)

-1

Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:

CH$$_3$$(CH$$_2$$)$$_{15}$$N$$^+$$(CH$$_3$$)$$_3$$Br$$^-$$

CH$$_3$$(CH$$_2$$)$$_{11}$$OSO$$_3^-$$Na$$^+$$

CH$$_3$$(CH$$_2$$)$$_6$$COO$$^-$$Na$$^+$$

CH$$_3$$(CH$$_2$$)$$_{11}$$N$$^+$$(CH$$_3$$)$$_3$$Br$$^-$$

JEE Advanced Subjects