CBSE Class 12 Chemistry HOTs Surface Chemistry Set A

CBSE Class 12 Chemistry HOTs - Surface Chemistry Set A. Higher Order Thinking Skills (HOTS) download and print.



1. Why is it necessary to remove carbon monoxide when ammonia is obtained from Haber’s process? 1
2. How does BF3 act as a catalyst in industrial process? 1
3. The conductance of an emulsion increases on adding common salt. What type of emulsion is it? 1
4. Gelatin is generally added to ice-creams. Why? 1
5. What is syneresis or weeping of gels? 1
6. Most effective electrolyte causing the coagulation of negatively charged AS2S3 solution is a) MgCl2 b) KCl c) K3 [Fe(CN)4] d) Na2 SO4 1
7. Silicate garden is developed by setting of colored ions in the void of silicates. It is a case of -----------------. 1
8. What is purple of casius? 1
9. Which of the following has minimum coagulating value? Why? 2
a) NaCl b) BaCl2 c) Al2 (SO4 )3 d) KCl
10. Critical temperatures of N2, CO and CH4 is 126, 134 and 190 K respectively. Arrange them in increasing order of adsorption on the surface of charcoal. Give reason. 2
11. The layer of fat in the pans used for manufacturing soaps can be removed by adding boiling washing soda solution. How will you account  or it? 2
12. Why artificial rain can be caused by throwing common salt on the clouds? Explain. 2
13. Explain the curdling of milk when it is sour. 2
14. In order to coagulate a fixed amount of As2S3 sol how will NaCl, MgCl2 and AlCl3 vary in their activity? Explain with the help of related  ule.

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