Page 1 - Home Assignments-surface chemistry
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Q.1 Define adsorption.
Q.2 What is the difference between adsorption and absorption.
Q.3 Define sorption.
Q.4 What is the value of ∆G at the state of adsorption equilibrium ?
Q.5 Differntiate between adsorbate and adsorbent by giving a suitable example.
Q.6 Define desorption.
Q.7 What is surface energy.
Q.8 Why adsorption is exothermic ?
Q.9 What is the sign of ∆S and ∆H for adsorption.
Q.10Define the enthalpy of adsorption.
Q-11How does chemical adsorption of a gas on a solid very with temp?
Q-12 Of NH 3 and N 2 which gas will be adsorbed more readily on the surface of charcoal and
why?
Q.13 Write any two characteristics of Chemisorption.
Q.14 Of CO 2 and SO 2 which gas will be adsorbed more readily on the surface of charcoal and
why?
Q.15 Why does physisorption decrease with the increase of temperature?
Q.16Why are powdered substances more effective adsorbents than their
crystalline forms?
Q.17∆H for chemisorption is high .why?
Q.18Give an equation showing variation of extent of adsorption with concentration
of a solution?
Q.19 Define homogeneous catalysis.
Q.20 Define heterogeneous catalysis.
Q.21 What is shape selective catalysis.
Q.22 What is the difference between catalytic promoter and catalytic poison.
Q.23 Give one example of shape selective catalyst.
Q.24 Give an example of heterogeneously catalysed reaction.
Q.25 In Harber’s process for NH 3 synthesis which catalyst is used?
Q.26 In contact process for manufacture of H 2SO 4 which catalyst is used?
Q.27 Give two example of homogeneous catalysis?
Q.28 How do metal ions act as activators?
Q.29What is the optimum temperature and pH for enzyme catalysed reactions?
Q.30In Haber’s process, hydrogen is obtained by reacting methane with steam in
presence of NiO as catalyst. The process is known as steam reforming. Why is
it necessary to remove CO when ammonia is obtained by Haber’s process?
