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.

CHAPTER:5

SURFACE CHEMISTRY

1 - MARK QUESTIONS
 
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
 
2 - MARKS QUESTIONS
 
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
 
3 - MARKS QUESTIONS
 
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.

Please refer to link below to download pdf file of CBSE Class 12 Chemistry HOTs - Surface Chemistry Set A.

Tags: 

 


Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

CBSE Board 2020 Important announcement regarding rescheduling of Class 10 12 Board Exams

CBSE Board Exams 2020: Here's when Board will organize the CBSE Class X and Class XII Board Exams.   All the candidates appearing for CBSE Standard X and Standard XII Board Exams 2020 can cross-check the essential notice released by the board concerning the...

Board Exams Class 10 and Class 12 Datesheet 2020

CBSE has announced the datesheet for the remaining exams of class 10 and class 12 exams. The exams are going to start in July. The class 10 and 12th board exams will be conducted for the remaining 29 papers from July 1 to July 15, 2020, at various centers nominated by...

CBSE Board Results for Class 10 and Class 12

Anticipated CBSE result 2020 Date and Time: This is all you wish to know! Here is the news which all students are waiting for. The expected date and time for the CBSE Class X and XII Results 2020 can be viewed here by the students. CBSE Result 2020: The Central Board...

CBSE Boards Answer Sheet Evaluation Class 10 and Class 12

HRD Minister Ramesh Pokhriyal, through a video conference with all the education ministers of the state, discussed the further steps to be taken to smoothen the education process during the Covid-19 lockdown. The most important topic which was discussed repeatedly on...

Applied Mathematics Introduced by CBSE as Elective for Class 11 and Class 12

Mathematics Syllabus Revised by CBSE at the Senior Secondary Level! The Central Board of Secondary Education (CBSE) to offer 'Applied Mathematics' as an Elective for XI and XII standard students. The elective subject, Applied Mathematics, is focused at evolving an...

CBSE advisory on student marks

CBSE has issued a public advisory for all students to be careful from unscrupulous persons impersonating themselves as officers/officials of CBSE. These people have been contacting parents and have been telling them that they have access to student marks data for Board...

×
Studies Today