Amrita Vishwa Vidyapeetham 2011 B.Tech Electronics and Communications Engineering First semester chemistry - Question Paper

Amrita Vishwa Vidyapeetham
B.Tech .Degree Examinations-December 2011
1st semester
CHY 100 Chemistry
(common to all branches)
Time : three hours maximum: 100 marks

ans all the ques.
Part A

1.What are priming and foaming?

2.Calculate the amount of permanent and temporary hardness current in a water sample containing calcium bicarbonate 1.62 g/l ,calcium sulphate 1.36 g/l ,magnesium chloride 0.95 g/land sodium bicarbonate 0.84 g/l.(atomic weights are Ca =41;C =12;S 32;Mg =24.3;Cl=35.5).


3.Predict the no of phases ,components and degrees of freedom for the subsequent system
Fe(s)+H2O(g) ? FeO(s)+H2(g)

4.What happens when a melt containing 1% Ag and 99% Pb is cooled?

5.The intensity of the radiation is decreased to 1 half when a monochromatic radiation is passing through a solution of concentration 0.05M through a path length of 10 cm. compute the molar extinction coefficient of the substance.

6.How does the solvent polarity affect the wavelength(max) values in UV-V is spectrum?

7.Concentrated sulphuric acid is stored in high carbon steel tank which is connected to the positive terminal of the Potentiostat.Why?

8.In the electro chemical series Ti is placed above Ag whereas in the galvanic series Ag is aboveTi.Why?

9.What are the fullerness?compare the size with that of a football.

10.Ornamental gold is golden yellow whereas gold nano particles are ruby red in colour.Why?


Part B

11.a. explain the principal of desalination of water by reverse osmosis and electro dialysis.[6 marks]
b. What is meant by internal treatment?discuss any 4 methods.[6 marks]
c. What is break point chlorination and elaborate its advantages?[4 marks]


12.a. Construct the phase diagram for simple eutectic system with the help of cooling curves [6 marks]
b.Construct an ellingham diagram and show that how this is helful in extraction of metals.[6 marks]
c.Is it possible to separate Co completely from a mixture of Co-Ni by heating and cooling process?Justify your ans.[4 marks]


13 a. Sketch the 1HNMR spectra for the molecules ClCH2CH2CH2CL and CH3C6H4CH3 and identify the peaks[6 marks]
b. Write a note on the effect of conjugation and hydrogen bonding on IR spectra [6 marks]
c. The force constant is identical for 1H35Cl and 2D35Cl .if the fundamental frequency of 1H35Cl is 2890 /cm,calculate the fundamental frequency of 2D35Cl.[4 marks]


14. a. What is electrochemical corrosion ?discuss the corrosion of iron in acidic and neutral environment[6 marks]

b. What is meant by anodic protection ?how is it performed?[6 marks]
c. Write short notes on i. seasonal cracking ii. Caustic embrittlement[4 marks]

15. a. explain any 2 methods for the synthesis nanotubes with suitable examples.[6 marks]
b. discuss the mechanism of conduction in poly acetylene.[6 marks]
c. Write brief on smectic and cholestric liquid crystals.[4 marks]

Earning:   Approval pending.