fsc 2nd year Chemistry guess paper 2019
12th class Chemistry Guess Paper All Punjab Boards or Fsc 2nd year Chemistry guess paper 2019
- What are the improvements made in mandleeves periodic table.
- Define hydride and give their classification.
- Discuss the position of hydrogen with carbon family giving similarities and dissimilarities,
- Explain peculiar behaviour of beryllium.
- Explain the construction of down cell. Give reactions taking place at cathode and anode.
- Write commercial method for preparation of NaoH.
- Discuss the role of lime in industry.
- How borax is manufactured.
- What are silicones. Write uses of silicones.
- Describe birkeland and eyde process for the manufacture of nitric acid.
Compare and cotrast betwen oxygen and sulpher.
- Write four points which shows the peculiar behaviour of fluorine from other halogen.
- Describe preparation of bleaching powder by Backmanns process.
- Write the applications of noble gases.
- Describe Bessemers process for manufacture of steel.
- Describe cracking of petrolum. Explain any two ways in which craking carried out.
- What is orbital hybridization. Explain sp3 hybridization of carbon.
- Explain structure of ethane on the base of hybridization.
- Write two methods for preparation of alkenes.
- Describe with examples the acidic nature of alkynes.
Convert acetylene into Glyoxal and chloroprene.
- Describe the structure of benzene on the basis of atomic orbital treatment.
- Write down four methods of preparation of benzene.
- What are friedals craft reactions. Explain mechanism of alkylation and acylation of benzene.
- Discuss Sn2 reactions of alkyle halyde in details.
- Differentiate between Sn1 Sn2 reactions.
- Define nucleophilic substitution reaction and discuss the salient features of Sn1 reactions.
What are B-elimination reactions. Discuss its types.
- How ethyl alkohal is obtained by the fermentation of molasses and starch.
- Write two methods for preparation of phenol.
- Write a note on cannizzarros reactions.
- What is aldol condensation. Give its mechanism.
- How 2,4 dinitrophenyle hydrazones are prepared and Write mechanism of ammonia derivatives with carbonyl compound in general.
- Write dpwn any four methods of preparation of acetic acid with reactions.
- What is smog? Explain the pollutants whics are the main cause of photochemical smog.
- Explain how pestisides are dangerous to human beings.