Wednesday, December 14, 2016

CHEMISTRY 1ST YEAR B TECH KTU IMPORTANT QUESTIONS

CHEMISTRY 1ST YEAR B TECH KTU IMPORTANT QUESTIONS 


APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

1ST SEMESTER B TECH KTU IMPORTANT PREVIOUS QUESTIONS


1. Write the essential components of gas chromatography equipment?
2. What is certane number?
3. The absorbance of a 0.01M dye solution in ethanol is 0.62 in a 2cm cell for light of wavelength 500A.If the path length of light through the sample is doubled and the concentration is made half, what will be the value of absorbance?
4. What is poly aniline? Give its structure and two applications?
5. A zinc wire is dipped in silver nitrate solution taken in beaker A and a silver wire is dipped in zinc sulphate solution taken in beaker B. Predict in which beaker the ions present will get reduced. Given that the standard reduction potential of zinc and silver are -0.76V and 0.80V respectively.
6. Write two examples of solid lubricants. Compare their structure.
7. Hard water does not produce much lather with soaps or detergents. Give reason.
8. Write the significance of BOD.
9. Write three points of comparison between UV and IR spectrum.
10. Write three advantages of hydrogen – oxygen fuel cell.
11. Define the term cell constant. The specific conductivity of a 0.3N KCI solution at 270 C is 0.028 S cm-1 Resistance of the cell containing this solution is 300 ohms. Determine cell constant.
12. What is the nature of bonding in carbon nanotubes? Write two applications of carbon nanotubes (CNTs).
13. Write the composition and uses of natural gas.

14. What is viscosity index (V.I)? Oils having high viscosity need not necessary have high V.I Comment.
15. Give three points of difference between aerobic oxidation and anaerobic oxidation.

16. What are ion exchange resins? Give examples for cation and anion exchange resins?

17. What is chemical shift? Write the cause of chemical shift.
(b) Co molecule absorbs at 2140cni4. Calculate the force consent of the molecule, given atomic masses of C and 0 are 12u and 16 u respectively 1u=1.67 x10-27 kg.
(c) What are the various energy transitions possible in a molecule? Why does electronic spectrum appear broad?

18. (a) Why does a signal for a particular set of protons split into a multiplet?
Give number of signals. Peak ration and multiplicity of different sets of protons in the NMR spectrum f1 bromopropane.
(b) Give a neat and labeled sketch of instrumentation of UV- visible spectrometer.
(c) Write a note on vibrational modes of carbon dioxide molecule. State which of these modes are IR active; and give reason for their activity.

19. (a) Draw a well labelled diagram of calomel electrode. Write electrode reaction and representation of the electrode.
(b) Find the potential of hydrogen electrode at 250 C for solution of pH=0 and pH = 14.

20.(a) Explain the principle and instrumentation of HPLC.
(b) Differentiate between DTA thermogram and TGA thermo gram graphically. Give one important application of each type.


21. (a) Give a comparison of GSC and GLC.


(b) Write the working of TLC. List the important applications.
22. (a) Write the preparation and important properties of silicone rubber.



(b) Write the sol-gel method for the synthesis of nano materials.

23. (a) Give the classification of conducting polymers and write the mechanism of conduction in them.
(b) Write structural formulae and important uses of the polymers Kevlar and ABS.

24. (a) What are greases? Write a brief note on their classification.
(b) The temperature of 1000g of water was increased from 26.50C to 29.20C on burning 0.80g of a solid fuel in a bomb calorimeter. Water equivalent of calorimeter and latent heat of steam are 385 g and 587 cal/g respectively. If fuel contains 0.7% hydrogen calculate its gross and net calorific value.




Load disqus comments

0 comments

Follow us on Facebook
Powered by: KTU Online