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Surface Chemistry

Short Answer Type

61. How does chemical adsorption of a gas on a solid vary with temperature?

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62. What is meant by ‘Shape selective’ catalysis?

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63. Define the enthalpy of adsorption.

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64. Write down the heterogeneous catalyst involved in the polymerisation of ethylene.

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65. Of NH₃ and N₂ which gas will be absorbed more readily on the surface of charcoal and why?

Answer:

NH₃ will be adsorbed more easily due to more surface area. Therefore, it has more Van der Waal's forces of attraction and easily liquefiable as compared to N₂.

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66. What is the range for the enthalpy of adsorption for physisorption and chemisorption?

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67. Lyophilic sols are reversible whereas lyophobic sols are irreversible. Why?

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68. Why does chemisorption have more heat of adsorption than physico-adsorption?

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69. Colloidal solution can be had in a water and in air as media. What distinctive names are given to these two types of sols?

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70.

Which sol is more stable-lyophilic or lyophobic?

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

65. Of NH3 and N2 which gas will be absorbed more readily on the surface of charcoal and why?

65. Of NH₃ and N₂ which gas will be absorbed more readily on the surface of charcoal and why?