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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018

35 Course Code: 0 1

Course Name: ENGINEERING CHEMISTRY

Max. Marks: 100 Duration: 3 Hours

PART A

Answer all questions, each carries 2 marks. Marks

1 Which of the following molecules can give IR absorption spectrum? Write the (2)

condition for IR activity. (a)O2 ௫01 (0೮೦ (9) 2
2 An iron nail is dipped in 1 M HCI, what are the redox reactions taking place? (2)

Justify it based on the following standard reduction potentials 2H’+2e>H, ६0
= 0 V; 7030೨76 805 - 0.04 V; 70720೨70 80 =-0.44V

3 Draw the thermo gram of Calcium oxalate. (2)
4 What are Copolymers? (2)
5 What are the advantages of liquid fuels over solid and gaseous fuels? (2)
6 What are semi solid lubricants? (2)
7 Dissolved oxygen of a water sample is inversely proportional to its (2)
temperature. Justify.
8 In the determination of hardness of water by EDTA method NHsOH-NH,CI (2)
buffer solution is used. Why?
PART B
Answer all questions, each carries 3 marks.
9 A 100 ppm standard solution of Fe" after developing colour with excess (3)
ammonium thiocyanate solution shows a transmittance of 0.4 at 622 nm, while
an unknown solution of 1൦ after developing colour with excess ammonium
thiocyanate solution shows a transmittance of 0.6 at same wave length.
Calculate the concentration of Fe** in unknown solution.
10 Calculate single electrode potential of calomel electrode at 25 °C when the (3)
concentration of KCI solution is 0.1M, given that E° standard calomel electrode
= 0.2810 ५.
1] Differentiate TGA and DTA. (3)
12 How do you classify Nanomaterials based on dimensions? (3)

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