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Q. Which of the following statements is incorrect regarding physisorptions ?(1) Under high pressure it results into multi molecular layer on adsorbent surface(2) Enthalpy of adsorption $\left(\Delta \mathrm{H}_{\text {adsorption }}\right)$ is low andpositive(3) It occurs because of Van der Waal’s forces(4) More easily liquefiable gases are adsorbed readi AIEEE-2009
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Sol. (2)$\Delta \mathrm{H}$ is negative
Q. According to Freundlich adsorption isotherm, which of the following is correct ?(1) $\frac{\mathrm{x}}{\mathrm{m}} \propto \mathrm{p}^{0}$(2) $\frac{\mathrm{x}}{\mathrm{m}} \propto \mathrm{p}^{1}$(3) $\frac{\mathrm{x}}{\mathrm{m}} \propto \mathrm{p}^{1 / \mathrm{n}}$(4) All the above are correct for different ranges of pressure AIEEE-2012
Q. The coagulating power of electrolytes having ions $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Ba}^{2+}$ for aresenic sulphide sol increases in the order :-(1) $\mathrm{Al}^{3+}<\mathrm{Ba}^{2+}<\mathrm{Na}^{+}$(2) $\mathrm{Na}^{+}<\mathrm{Ba}^{2+}<\mathrm{Al}^{3+}$.(3) $\mathrm{Ba}^{2+}<\mathrm{Na}^{+}<\mathrm{Al}^{3+}$(4) $\mathrm{Al}^{3+}<\mathrm{Na}^{+}<\mathrm{Ba}^{2+}$ JEE-Main 2013
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Sol. (2)According to hardley schuzle rule
Q. 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)(1) log (1/n) appears as the intercept(2) Both k and 1/n appear in the slope term(3) 1/n appears as the intercept(4) Only 1/n appears as the slope JEE-Main 2016
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Sol. (4)According to Freundlich isotherm
Q. 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 lighused.(b) The diameter of the dispersed particle is not much smaller than the wavelength of the lightused.(c) The refractive indices of the dispersed phase and dispersion medium are almost similar inmagnitude.(d) The refractive indices of the dispersed phase and dispersion medium differ greatly inmagnitude.(1) (a) and (d)(2) (b) and (d)(3) (a) and (c)(4) (b) and (c) JEE – Main – 2017
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Sol. (2)As per NCERT book (fact)
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