BSc Chemistry SEM III 2019 2020 Oct 2020 CHEMISTRY PAPER II Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 A.Fill in the Blanks : 12 marks
2. Q1 According ta Arrhenius theory as temperature increases, the rate of li) The reactions of type: ki, B Care
   • iv) method is used to determine the rate of ultra-fast reaction
   • v) method is used to determine rate of reaction of ultra fast
   • vi) activation energy of reaction at a given temperature is found to be 2.303 RT J/mol. The ratio of rate constant to the Arrhenius factor is
   • vii) | Atomic number of silicon is viil) Atomic number of germanium is ix} tetrachloride has number
   • x) is the very good conductor Dinitrogen pentaoxide is also known as
   • xii) known as laughing gas has quite effective electron widrawing inductive effect at position than p-position
   • (a) meta (b) ortho (c) both (a) and (b) CHEMISTRY SEM-III MARKS 100 TIME 3HRS
   • xiv) react with conc sulphuric acid at to form alkyl hydrogen sulphate or alkyl bisulphate is called with oxidizing agent form ketone containing same number of carbon atoms
   • xvi) The methylene group is with oxidizing agent form aldehyde containing same number of carbon atoms
   • (a) R-OH (c) R-OCI
   • B) State whether the following statements are true or false 3
   • i) Distribution law is applicable in concentrated solutions
   • ii) Total number of electrons involved in tetraborane is 20 Phenols are weak acids,
   • C) Match the following-- li) Activated complex theory ii) Tetrahedral and 5
   • v) O-acylation of phenol v) formation of ester
3. Q2 Answer any four 20 marks
   • a. Explain the Lindmann’s unimolecular theory of reaction rates
   • b. Explain reversible reactions giving a suitable example
   • c. State and explain any five conditions for the validity of Nernst Distribution
   • d. Discuss the variation of mutual solubility with temperature for the CHEMISTRY MARKS 100 TIME 3HRS
   • e. For order reaction A=1.8x10" sec” and at a particular temperature, fraction of molecules reaching transition state is 3x Find rate constant (k) at that
   • f. A mixture of water and aniline boils at a temperature of at pressure of x The vapour pressure of water at this temperature is x 10 Find the composition of the distillate [Given : Molecular weight of water = 18, molecular weight of aniline = 93]
   • a. Explain the purification of ‘Germanium’ by Czochralski technique
   • b. Discuss the gradation in properties of group 15 elements with respect to atomic radii and energy values
   • c. Name minerals containing germanium. How metal is extracted
   • d. Write down the preparation ,properties and structure of
   • e. Write notes on ‘Oxidation states’ exhibited by the elements of group 14
   • f. Write a note on HABER-BOSCH process
4. Q4 Answer any four. 20 marks
   • a. Write a note on Fries rearrangement of phenolic ester
   • b. How will you convert aldehydes and ketones to primary and secondary alcohols catalytic hydrogenation (ii) reduction with metal hydrides
   • c. Write a note on Dow’s process
   • d. What is O-acylation? How O-acylation of phenol carried out ?
   • e. Explain Claisen rearrangement of alkoxy arenes
   • f. Write a note on Rossenmund reduction 5 Attempt any four :— (20)
   • a. Define Nernst distribution law. Give its application in solvent extraction process
   • b. What are complex reactions? Give their types with examples
   • c. Why Zone refining technique is not effective for the purification of silicon’
   • d. Discuss the preparation of borax from ‘boric acid’. Mention any two important and any two uses of borax
   • e. What is sulphonation of alcohols? Give its application with an example
   • f. How will you obtain phenol to cumene?

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