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

Explanation

(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,