Read and download free pdf of CBSE Class 12 Chemistry Surface Chemistry Worksheet Set C. Students and teachers of Class 12 Chemistry can get free printable Worksheets for Class 12 Chemistry in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 12 students should practice questions and answers given here for Chemistry in Grade 12 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 12 Chemistry Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests
Surface Chemistry Class 12 Chemistry Worksheet Pdf
Class 12 Chemistry students should refer to the following printable worksheet in Pdf for Surface Chemistry in standard 12. This test paper with questions and answers for Grade 12 Chemistry will be very useful for exams and help you to score good marks
Class 12 Chemistry Worksheet for Surface Chemistry
1.Bleeding caused by a nick from a razor during shaving can be stopped by rubbing with alum. Why?
Ans: Blood is a negatively charged colloidal solution. When alum is rubbed the positively charged Al3+ ions from alum neutralizes the charge on the particles and makes it coagulate to form a clot.
2. In which of the following does adsorption take place and why?
(i) Silica gets placed in the atmosphere saturated with water.
(ii) Anhydrous CaCl2 placed in the atmosphere saturated with water.
Ans: Water vapour gets adsorbed on the surface of silica since it is a good adsorbent.
3. Action of soap is due to emulsification and micelle formation. Comment.
Ans: Soap molecules adsorb on to the dirt surface and try to emulsify it by forming micelles. Soap micelles thus make the insoluble dirt(greasy materials) into colloidal form such that it gets washed away by water.
4. What is the use of ZSM-5?
Ans: It converts alcohols directly into gasoline (petrol) by dehydrating them to give a mixture of hydrocarbons.
5. Give one example for each (i) sol (ii) gel.
Ans: (i) paints (ii)Butter or any other correct options.
6. What is collodion?
Ans: It is a 4% solution of nitrocellulose in a mixture of alcohol and ether.
7. Can we form a colloid with two gaseous components?Comment.
Ans: No. a gas mixed with another gas forms a homogeneous mixture which does not come under a colloidal system.
8. What are the physical states of the dispersion medium and dispersed phase in froth?
Ans: In froth, the dispersed phase is a gas while dispersion medium is a liquid.
Question. Preparation of Lyophobic sols by chemical method involves
(a) double decomposition
(b) oxidation & reduction
(d) all of these
Question. A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of same sol is studied using NaCl, BaCl2 and AlCl3 solutions. Their coagulating power should be
(a) NaCl > BaCl2 > AlCl3
(b) BaCl2 > AlCl3 > NaCl
(c) AlCl3 > BaCl2 > NaCl
(d) BaCl2 > NaCl > AlCl3
Question. Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl, Na2SO4 and Na3PO4 solutions. Their coagulating values will be in the order
(a) NaCl > Na2SO4 > Na3PO4
(b) Na2SO4 > Na3PO4 > NaCl
(c) Na3PO4 > Na2SO4 > NaCl
(d) Na2SO4 > NaCl > Na3PO4
Question. Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is
(a) D < A < C < B
(b) C < B < D < A
(c) A < C < B < D
(d) B < D < A < C
Question. The disease kala azar is caused by
(a) colloidal antimony
(b) milk of magnesia
(d) colloidal gold
Question. Which one of the following impurities present in colloidal solution cannot be removed by electrodialysis?
(a) Sodium chloride
(b) Potassium sulphate
(d) Calcium chlorid
Question. The physical adsorption of gases on the solid surface is due to:
(a) Covalent bond
(b) Hydrogen bond
(c) Ionic bond
(d) Van der waal's forces
Question. The electrical charge on a colloidal particle is observed by:
(c) Brownian movement
Question. The density of gold is 19 g/cm3. If 1.9 × 10–4 g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per mm3 of the sol will be
(a) 1.9 × 10 12
(b) 6.3 × 10 14
(c) 6.3 × 1010
(d) 2.4 × 106
Question. Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol?
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