Saturday 24 August 2013
Class Seating Arrangement
Dear friends,
Our class seating arrangement for the monthly test for the month August is being uploaded. Please contact- ME(Vaisakh Pisharody) for more details, if any:-
Our class seating arrangement for the monthly test for the month August is being uploaded. Please contact- ME(Vaisakh Pisharody) for more details, if any:-
Thursday 22 August 2013
Surface Chemistry Home Work
SURFACE CHEMISTRY
Q1. Give one example each of w/o and o/w emulsion.
Q2. What is the difference between a sol and a gel?
Q3.Why is it necessary to remove CO when ammonia is obtained by Haber’s process?
Q4 -On passing H2S through dilute HNO3 the colourless solution becomes turbid. Why ?
Q5. Write a mathematical expression showing relationship between the amount of solute adsorbed per unit mass of the solid adsorbent & the concentration of the solute in the solution
Q6 -What is occlusion?
Q 7-4 Out of CO & NH3 which is adsorbed on activated charcoal to larger extent & why?
Q8 - What is meant by critical micellisation concentration ?
Q9 - What is Helmholtz electrical double layer?
Q10- . Define zeta potential.
Q11 -. Write down the heterogeneous catalyst involved in the polymeration of ethylene.
Q12 -Name the shape selective catalyst used in petroleum industry.
Q13- Why Ferric hydroxide sol coagulates on addition of aqueous solution of sodium sulphate’
Q14 -Why gelatin is generally added to ice-cream?
Q15 Mention the application of ZSM -5 in petroleum industry.
Q16. Name the catalyst and the promoter used in Haber’s process for manufacture of ammonia.
Q17 Why is the ester hydrolysis slow in the beginning and becomes faster after sometime?
Q18 . Why is it essential wash the precipitate with water before estimating it quantitatively?
Q19 -. What is the sign of ∆H and∆S when bromine gas is adsorbed on the surface of charcoal more readily and why?
Q20 -.Why is sky blue in colour?
Q21 - . If we add equimolar amount of Fe(OH) 3 and As2S3 sol what will happen?
Q22 -. What is observed when NaCl is added to a colloidal solution of Fe(OH)3 ?
Q23 - Why are deltas formed where river water meets sea water ?
Q24 - Why silica gel is used as dehumidiser?
Q 25 - What is the significance of the gold number
Q 26. What is meant by adsorption isobar ? Explain the effect of temperature on physical and chemical adsorption ?
Q27 . Some Zeolites are used to separate long straight chain hydrocarbons from branched chain hydrocarbon in petrochemical industry. Explain how this separation becomes possible?
Q28 -.What do you understand by activation of adsorbent? How is it achieved?
Q.29. Adsorbtion ,if spontaneous, is exothermic.Explain.
Q.30 Explain the following in brief :
1) Sun looks red at the time of sun set.
2) Physisorption is multimolecular while chemisorption is monomolecular.
Q.31 Explain what happens when
1. persistent dialysis of a colloidal sol is carried out
2. a beam of light is passed through colloidal sol
3. a dilute solution of FeCl3 is added to freshly prepared Fe(OH)sol
4. gelatin is added to gol sol
Q.32Bleeding caused by a nick from a razor during shaving can be stopped by rubbing. Explain.
Q.33In which of the following does adsorption take place and why ?
(i) Silica gets placed in the atmosphere saturated with water.
(ii) Anhydrous CaCl2placed in the atmosphere saturated with water.
Q.34Explain the following observations:
(a) Ferric hydroxide sol. Gets coagulated on addition of sodium chloride solution.
(b) Cottrell’s smoke precipitator is fitted at the mouth of the chimney used in factories.
(c) Physical adsorption is multilayered, while chemisorptions is monolayered.
Q.35Arrange N2,CO,CH4 in the increasing order of adsorption on the surface of activated charcoal
given that their critical temperatures are 126,124,190 K respectively.
Q.36The coagulation of 100 mL of colloidal sol. is completely prevented by adding 0.25g of a
protective colloid ‘A’ to it before adding 1 mL of NaCl solution. Determine the gold number
of A.
Q.37Why are medicines more effective in colloidal state?
Q.38 In Chemisorption, when we increase the temperature, the rate of adsorption first increases
and then decreases. Why it is so?
Q.39 Explain Hardy Schulze law. Write the following compound in increasing order of their
coagulating power for As2S3 sol:
NaCl,AlCl3 ,Ba(OH)2
Q.40 Explain:
(i) Delta is generally formed when river meets the ocean.
(ii) Ferric hydroxide solution is more readily coagulated by Na3
HIGHER ORDER THINKING QUESTIONS (Optional)
Q. 1. What is meant by Autocatalysis and Induced Catalysis?
Q2: Explain as to why SnO2 forms a positively charged sol in solutions with pH< 7 and negatively charged sol in solutions with pH> 7.
Q 3 :- In an adsorption experiment, a graph between log (x/m) versus log p was found to be linear with a slope of 45○. The intercept on the log (x/m) axis was found o be 0.3010. Calculate the amount of the gas adsorbed per gram of charcoal under the pressure of 0.6 bar.
Q4. i)What is the cause of Brownian Movement ?
ii)Compare the coagulating power of K2C2O4 with that of KBr. (Their respective coagulating
values are 0.238 and 138 )
Tuesday 20 August 2013
Friday 16 August 2013
August Monthly Test Time Table
Dear friends,
As you may be aware of the fact that our Time Table has been informed. Please take care of our time table since I have heard about many incidents where people have kind of forgotten the actual date of the exam.
As you may be aware of the fact that our Time Table has been informed. Please take care of our time table since I have heard about many incidents where people have kind of forgotten the actual date of the exam.
Date (Day)
|
XII Monthly
|
26.08.2013
|
Physics
|
27.08.2013
|
Maths
|
29.08.2013
|
English
|
30.08.2013
|
Chemistry
|
31.08.2013
|
Computer Science
|
Yours Lovingly
Vaisakh Pisharody
Tuesday 13 August 2013
Maths Homework- Approximation_Application of Derivatives
Dear Friends,
Since I am not interested to write all questions, I will be giving you the question number present in the Mathematics textbook(Part I-for those who don't know). The question numbers are:-
Q.1.(v),Q.1.(xiv),Q.1.(xv),Q.3.,Q.7
So my dear friends, as per madam's instruction we are supposed to submit this homework+the below one, by 14/08/2013(now that would be tomorrow). So please try to bring them without fail.
Yours Lovingly
Vaisakh Pisharody :D
Since I am not interested to write all questions, I will be giving you the question number present in the Mathematics textbook(Part I-for those who don't know). The question numbers are:-
Q.1.(v),Q.1.(xiv),Q.1.(xv),Q.3.,Q.7
So my dear friends, as per madam's instruction we are supposed to submit this homework+the below one, by 14/08/2013(now that would be tomorrow). So please try to bring them without fail.
Yours Lovingly
Vaisakh Pisharody :D
Monday 12 August 2013
Exam List
Dear Friends,
As you all may know tomorrow we are going to have a series of class tests based on the lessons that have been taken in our class of the respected subjects. For them who may not be aware of the exams, the report is being underwritten:-
English:- The Hound of the Baskerville:- Chapter 1-3;
Physics:- Alternating Current;
Computer:- Date File Handling;
Best of luck to all my dear friends.
Yours Lovingly
Vaisakh Pisharody :D
As you all may know tomorrow we are going to have a series of class tests based on the lessons that have been taken in our class of the respected subjects. For them who may not be aware of the exams, the report is being underwritten:-
English:- The Hound of the Baskerville:- Chapter 1-3;
Physics:- Alternating Current;
Computer:- Date File Handling;
Best of luck to all my dear friends.
Yours Lovingly
Vaisakh Pisharody :D
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