Answer any three of the following questions. b. What is Peptisation ?

1.	Answer any three of the following questions. b. What is Peptisation ? Give an Example
Answer» Solution :(a) The catalytic reaction that depends upon the PORE STRUCTURE of the catalyst and the size of the reactant and product molecules is called shape selective catalysis. ZSM-5 (b) The process of conversion of precipitate (FRESHLY prepared) into colloidal sol by the addition of small amount electrolyte (which have a common ion of the precipitate). Example: When a freshly prepared ferric hydroxide ppt is treated with ferric chloride electrolyte, it gives ferric hydroxide sol. Any one OR Any other suitable example (c) `x/m = k p^(1//n)` Detailed Answer: (c) It gave an empirical relation between the quantity of gas adsorbed by unit MASS of solid adsorbent and pressure at a particular TEMPERATURE. It is given by the equation: `x/m = k.p^(1/n)` where, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. k and n are constants which depend on the nature of the adsorbent and the gas at a particular temperature,

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