|Item I||Item II|
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particles is not much smaller than the wavelength of the light used
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.
I. (NaCl) = 52,
II. (BaCl2) = 0.69,
III. (MgSO4) = 0.22
The correct order of their coagulating power is
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25°C. For this process, the correct statement is
The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide sol increases in the order :
The given graphs/data I, II, III and IV represent general trend observed for different physisorption and chemisorptions processes under mild conditions of temperature and pressure. Which of the following choices (s) about I, II, III and IV (are) correct?
Assertion Small quantity of soap is used to prepare a stable emulsion.
Reason Soap lowers the interfacial tension between oil and water.
Assertion : In chemisorption, adsorption keeps on increasing with temperature.
Reason : Heat keeps on providing more and more activation energy.
Among the electrolytes Na2SO4, CaCl2, Al2 (SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is
Reason Detergents having highly branched chains are biodegradable.
STATEMENT-2: The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
(A) H increases for system
(B) S increases for gas
(C) S decreases for gas
(D) G increases for gas
(b) In a solution of 100 ml 0.5 M acetic acid, one g of active charcoal is added, which adsorbs the acetic acid. It is found that the concentration of acetic acid becomes 0.49 M. If the surface area of the charcoal is 3.01 × 102 m2, calculate the area occupied by a single acetic acid molecule on the surface of the charcoal.