SURFACE CHEMISTRY(QUIZ-3) 1 / 5 Which is favorable for physical adsorption? High T and high P High T and low P Low T and high P T and P do not affect Low temperature and high pressure provide help in increased physical adsorption because van der Waals’ forces of attraction will increase. 2 / 5 3g of activated charcoal was added to 50 ml of acetic acid solution (0.06 M) in a flask. After an hour it was filtered and the strength of filtrate was found to be 0.042 M. The amount of acetic acid adsorbed per gram of charcoal is 42 mg 54 mg 18 mg 36 mg Molarity of CH3COOH adsorbed= 0.06 – 0.042 = 0.018Number of milli moles of CH3COOH that areadsorbed = 0.018 × 50 ml = 0.90Final Amount = 0.90 × 60 = 54 mg[∵∵ molar mass of CH3COOH is taken as 60 g mol-1] 3 / 5 The protective power of lyophilic colloidal sol is expressed in terms of coagulation value gold number CMC (Critical Micelle Concentration) oxidation numbers Gold number is used to measure protective power of colloids. If the gold number is lowered, the protective power will increase, e.g., gelatin. 4 / 5 H2 gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to. very strong van der Waal’s interaction very weak van der Waals forces very low critical temperature very high critical temperature The Correct Answer Is very weak van der Waals forces. 5 / 5 Freundlich adsorption isotherm is given by the expression xm = k p1/n which of the following conclusions can be drawn from this expression. When 1n = 0, the adsorption is independent of pressure. When 1n = 0, the adsorption is directly proportional to pressure. When n = 0, xm vs p graph is a line parallel to x-axis. When n = 0, plot of xm vs p is a curve. The Correct Answer Is When 1n = 0, the adsorption is independent of pressure. Your score isThe average score is 0% 0% Restart quiz
