Answers Assignment No – 1
Surface Chemistry
Ans 1.  Both ΔH and ΔS are negative.

Ans 2. Platinum and palladium are inert materials & are not attacked by the ions of the electrolyte or the products of electrolysis therefore used as electrodes for carrying out the electrolysis.

Ans 3. Physisorption is an exothermic process i.e, heat is produced in the process.
Solid (adsorbent) + gas (adsorbate) ↔ gas/solid (gas adsorbed on solid) + heat
According to Le‐Chatelier's principle, if we increase the temperature, equilibrium will   shift in the backward direction, i.e, gas is released from the adsorbed surface.

Ans 4. CO acts as a poison for the catalyst in the manufacture of ammonia by Haber's process.

Ans 5. Dispersed phase is gas, dispersion medium is liquid.

Ans 6. It is the catalytic reaction that depends upon the pore structure of the catalyst and size of the reactant and product molecules. 

Ans 7.  Due to (i) Solvation (ii) Charge on the colloidal particles.

Ans 8. Due to unequal collision between particles of dispersed phase and dispersion medium. 

Ans 9. Brownian movement / charge on colloidal particles.  

Ans 10. Sodium stearate (C17H35COO-Na+).

Ans 11. Ferric hydroxide sol.