Q13 / 54 · JEE Advanced 2017 (Paper 2) · 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
  • Correct answer
    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
  • 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

Solution

(i)  Emulsion is liquid in liquid type colloid.

(ii)  For adsorption,ΔH<0 and ΔS<0

(iii)  Smaller the size and less viscous the dispersion medium, more will be the Brownian motion.

(iv)  Higher the TC, greater will be the extent of adsorption.

Hence, the correct answer is options: 'B', 'D'.

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