JEE Advanced · Chemistry · 19. Surface Chemistry

The correct statement(s) about surface properties is(are)

A Cloud is an emulsion type of colloid in which liquid is dispersed phase and gas is dispersion medium
B Adsorption is accompanied by decrease in enthalpy and decrease in entropy of the system
C Brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solution
D The critical temperatures of ethane and nitrogen are 563 K and 126 K, respectively. The adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature

Verified Solution

Answer & Solution

Correct Answer

(D) The critical temperatures of ethane and nitrogen are 563 K and 126 K, respectively. The adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature

Step-by-step Solution

Detailed explanation

(i) Emulsion is liquid in liquid type colloid. (ii) For adsorption,

Δ H < 0

and

Δ S < 0

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From JEE Advanced

Explore more questions on app

	LIST -I		LIST -II
A)	$d s p^{2}$	P)	${[F e F_{6}]}^{4 -}$
B)	$s p^{3}$	Q)	$[T i {(H_{2} O)}_{3} C l_{3}]$
C)	$s p^{3} d^{2}$	R)	${[C r {(N H_{3})}_{6}]}^{3 +}$
D)	$d^{2} s p^{3}$	S)	${[F e C l_{4}]}^{2 -}$
		T)	$N i {(C O)}_{4}$
		U)	${[N i {(C N)}_{4}]}^{2 -}$