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  #1  
Old Monday, March 04, 2013
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Default Chemistry Papers CE- 2013

CHEMISTRY PAPER - I

CE-2013

Part-II



Q No. 2

a)What are engineering Ceramics? Describe the raw material used in making classic ceramics products. (08)

b) How Urea is manufactured on commercial scale? Support with schematic diagram. (08)

c) In what respect does inner orbital complex differ from outer orbital complex? (04)



Q No 3

a) Describe the oxy-acids of chlorine? (06)

b) Describe what is meant by silane and silanol? What is their role in preparation of Silicons. (08)

c) Define the following type of processes (06)
i) Iso-thermal
ii) Adiabatic
iii) Iso-choric
iv) Isobaric

Q No. 4

a) How CFT and MOT account for the fact that [CoF6]^-3 is para-magnetic but [Co(NH)3]^3+ is dia-magnetic? (06)

b) Discuss crystal field splitting in complexes having different geometries? (08)

c) What are the raw materials in production of calcium super-phosphate and cement? (06)


Q No 5

a) Derive Schrodinger wave equation and calculate the energy of the particle in one dimensional box having length @. (14)

b) What are the hazardous effects of Acid rain and Global Warming on Plants? (06)


Q No. 6

a) How Debye-Huckle theory is applied to determine activity and activity coefficient for strong electrolytes? (12)

b) How Standard electrode potential is measured? (06)

c) What is De-Broglie hypothesis? (02)

Q No. 7

a) How chlorine is produced on industrial scale? (08)

b) How Werner's Theory explains the structure of coordination compounds?(08)

c) Why ozone layer exists at certain altitude? (04)


Q No 8

a) Give application of chelates in biological and analytical systems? (04)

b) What are advantages of semiconductor devices? (04)

c) Derive mathematical form of Clausius - Clapeyron equation? (12)

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  #2  
Old Monday, March 04, 2013
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Default CE- 2013 Chemistry Paper - I

Chemistry Paper - II 2013

Part-II



Q No. 2 (a) Why do we use the three p-orbitals (2Px, 2Py, 2Pz) alone to form the three equivalent hybrid Orbitals on Carbon? (5)

(b) Give an example of an element that undergoes sp-hybridization in forming covalent bonds with other elements. What is the value of angle between the bonds that result from s-sp overlap of atomic orbitals. (5)

(c) What do you mean by kuminiscence? What are its types? (10)

Q No. 3 (a) The rate constant of a reaction is 1.2 x 10^-3 per second at 30 degree centigrade and 2.1 x 10^-3 at 40 degree centigrade. Calculate the energy of activation of the reaction. (10)

(b) What is E/Z system of configuration. Why it is preferred over cos/trans system of nomenclature in alkenes? (10)

Q No. 4 (a) Arrange the following functional groups in increasing order of stability of carbocation? (CH3)3C+, CH3+, CH3CH2+, CH=CH-CH2+, C6H5CH2+, (CH3)2CH+ (5)

(b) How can we prepare an aldehyde by following reactions. Gove atleast ONE representative example for each of these reactions. (10)

(i) Oxidation of Primary and Secondary Alcohol
(ii) Friedel Crafts Acylation
(III) Hydration of Alkynes
(iv) Glycol Cleavage

(c) Draw the structure of the following componds: (5)

i benzyl alcohol
ii 3-pentanol
iii 2,3-dihydroxyhexane
iv 2-sulhydrylbutane
v 3-pentanethiol

Q No. 5 (a) What are drying oils. For what purpose they are used? (10)
(b) How can you differentiate between trans-unsaturated and cis-unsaturated fatty acids. Which are more hazarduous to health? Explain with the help of example.(10)

Q No. 6 (a) Give atleast one representative example of the following reactions. (10)

i Termination Reaction
ii Disproportionate Reaction
iii Addition Polymerization
iv Friedel Crafts Alkylation
v Clasien Condensation
(b) What do you mean by gels? How are they classified? (10)

Q No. 7 (a) What are applications of colloids? (10)
(b) What are the applications of emulsions? Also give the harmdul effects of emulsions? (10)



Q No 8 Name the following structures:-

(I will try to attach, please)
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  #3  
Old Monday, March 04, 2013
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Question

I suggest to take a pen and a paper in hand and atleast answer some question on paper and then tell me was it easy or not.

Believe me, on CSS-Forum or seeing superficially the old papers is far too different from solving it on the day.

I ask the answer of 1st part of the paper.
Use internet and everybook and if you find the answer please let me know.

Similarly Oxidise a 2ndry Alcohol to Aldehyde.....plz.
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  #4  
Old Monday, March 04, 2013
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Arrow An Analysis of the Paper

Nomenclature 25 Marks 31% of the paper
General Chemistry 6 Marks (Reaction Types)

Portion wise

Theory of Chemical Bonding 10 Marks (It had a major role earlier)

Kinetics 10 Marks

Carbonyls 14 Marks (Conversions from Alkynes, FC etc)

Natural Products 20

Industrial Org Chem 20

Unexpectedly, Colloids have been asked in Paper-II. Luminescence, Colloids have been asked which is a bit over-stepping from course as the course is already too lengthy.

No question form Organic Halogens, Aromatics,Nitrogen Compounds. Also Main portions of big chapters of course which eat alots of time of the students to prepare have been altogether missed or given very few percentage.


The paper setter made it look like M/Phil Paper. Even M.Phil Organic Chemistry Student cannot prepare so much for one paper.

In MSc/M.Phil, you have to take 4 or 5 papers after each 6 months. So much is not asked in one papers and still FPSC is trying to play hide and seek. Objection is not that the paper is difficult It should justify course at least.

The problem with Sciences in CSS is that they sometime make a peace of cake and then they realize oh no......it was too easy and then next time a bomb is dropped by upsetting everyone. FPSC got the right to test the people but this is a bit unfare.


Even the Chemistry Lecturers donot face such tight papers where the examiner has resorted to play in the corners instead of asking the questions as they should be asked. Seems as if the papers are being made to kill. Candidate finds no way to save the paper. The examiner made 70% paper from 2-3 portion of syllabus and leaving everything behind. Such a paper favors those who by chance have grip on these 2-3 chapters and one who has done everything except these two, then he would be the most awkward person on earth during the paper. This trend is injustice.

Even the examiner gave nomenclature of compounds with more than 10 carbons and atleast 5 such molcules. So he was either favoring or killing. There are so many functional groups, at leats one from each but he would stick to one or two things......so the paper was Peace of Cake for those who knew it and a hell for those who prepared all but left last two portions.
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Old Monday, March 04, 2013
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Default Discouraging trend

If this would be the up coming trend for chemistry then students will not opt for the science subjects. Look towards psycholgy it made many people go crazy and again same is in chemistry. Paper I is very difficult however paper II was much better to attempt than paper I but overall both papers are not according to the level of bachelor studies.
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Old Monday, March 04, 2013
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Time is no doubt tough for chemistry, as they ask questions randomly in it, their most intrested area is applications of inorganic chemistry, specifically ceramics, semiconductors , that's was observed in PPSC 2011 paper. but any way good luck to all chemistry aspirants....

@ chintoo i find this answr for engineering ceramics

http://www.dynacer.com/applications/

and for raw material of ceramic products

http://en.wikipedia.org/wiki/Ceramic
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Old Tuesday, March 05, 2013
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I prepared too much but FPSC had a big plan i could not even sleep the whole night........

In CSS one bad paper is enough to ruin you ........ Fair play has very limited place with FPSC

These sort of papers are just to kill...

I am feeling very low

I was in the attacking mode in Paper - II but when i saw the paper , i was looking to save it.....it was just a deep whirlpool.........

I prepared Organic too much.....you name a reaction i would show you each and every electron and arrows moving with mechanism........but look at the paper Colloids, Emulsion, Luminescence, Hell like nomenclature, and he asked preparing Aldehyde from a Secondary Alcohol and Hydration of Alkynes.....kind of things........and Calculation of Activation Energy and Gels...........Open net and books to answer preparing Aldehyde from a Secondary Alcohol and that P-orbital question......Oh my God





They set the paper by giving 80% of the course a space of 20% and out of the rest 20% course, they made 80% of the paper and also over-stepped the course

My CSS drowned at the Chemistry Paper-II. Feeling very low and disappointed.

Thinking now to do M Phil ..........even M Phil would not demand so much hard study as CSS
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Old Wednesday, March 06, 2013
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Well i agree what chintoo hav said papers were tough and entirely somewhat out of course. But nonetheless i still managed to ride the storm. Paper 2 in my opinion was jus i dont knw what to say.... Bambozzled.
Anyways i attempted the activation energy question and the question regarding luminisce and gels.
In luminisce i gave those examples which came into my mind like biolumini sonolumini piezolumini n what not and regarding gels i jus stated what they are like a semi solid mass with water and they are classifed physically n chemically n then mentioned some of them like silica gel cooling gel hair gel and cement gel whatnot.
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Old Thursday, March 07, 2013
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Best of luck Nate for your last attempt

I left them altogether. I do not know about luminescence and gels. Knew little about gels. But i preferred not to say something wrong. So left them altogether. I was feeling like foot of an elephant on my chest when i had to leave these illogical and unjustified questions in the Organic Paper of CSS. He left all the organic and asked these sort of things.

What you answered about the three orbital thing in Part (a) of Question No. 2?
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Old Friday, March 08, 2013
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Quote:
Originally Posted by Chintoo2010 View Post
I am thinking to change the Chemistry with a big heart,,,,,,,,,i love chemistry but chemistry is ruining me too in CSS
I have been saying the same thing since last year on the forum that chemistry paper is not the thing to be opted in CSS, its paper pattern is typical consisting many parts from various areas. I'll suggest you all that please avoid to opt chemistry if you want to go for selected study as it needs a lot of time and selected study can ruin your score. Chemistry was the only subject where I was unable to solve all the questions last year so I am expecting lowest marks in chemistry.
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