JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year ENGINEERING CHEMISTRY Previous Question Paper (September - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Define hardness of water and explain why do we express hardness in terms of CaCO3 equivalents.
Answer
Hardness of water is the property that prevents the formation of lather with soap, caused by the presence of dissolved calcium and magnesium salts. It is expressed in terms of CaCO3 equivalents because its molecular weight is 100, which simplifies calculations, and it is the most insoluble salt that can be easily precipitated in water treatment.
What is Caustic embrittlement? Write the causes and disadvantages of Caustic embrittlement.
Answer
Caustic embrittlement is a form of corrosion caused by the presence of sodium hydroxide in boiler water, which leads to the formation of brittle cracks in steel, particularly at joints and rivets. It is caused by the leakage of alkaline water into hair-line cracks, where the water evaporates and NaOH concentration increases, attacking the iron to form sodium ferroate. This results in the weakening of boiler metal and potential structural failure.
Calculate the emf of concentration cell at 25°C consisting of two Cu electrodes immersed in solution of Cu+2 ions of 0.1M and 0.01M concentrations.
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Write over all net reaction of Lithium ion cell.
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What is vulcanization?
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Explain chain termination reaction in free radical polymerisation mechanism.
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Give the composition and uses of natural gas.
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How to estimate sulphur in coal? Explain.
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What is the composition of portland cement?
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What is High alumina cement? Give its applications.
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Part B
Describe the EDTA complexometric method to determine the hardness of water.
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Write the principle of Break point chlorination? Explain its significance.
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What are the advantages of internal treatment of boiler feed water? Explain Calgon and Phosphate conditioning.
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Write a brief account on primary treatment of sweage water.
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Derive the Nernst equation for the calculation of cell emf.
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Define fuel cell? Explain construction and working of Hydrogen-Oxygen fuel cell.
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Explain the working principle of calomel electrode.
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What is the emf of the following cell at 25°C. Fe(s)|Fe2+(0.01M)||Cu2+(0.5M)|Cu(s), The standard electrode potential of iron and copper are -0.44V and 0.34V respectively.
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Define conducting polymer and write the conduction mechanism in trans-polyacetylene.
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Define elastomer and write the preparation, properties and applications of Buna-S rubber.
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What are Biodegradable polymers? Explain the synthesis and applications of Polylactic acid polymer.
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Explain injection moulding method with neat a diagram.
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Explain proximate analysis of coal and state its significance.
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Discuss refining of petroleum.
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What is petrol? How is it synthesized by Fischer-Tropsch’s process?
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Calculate the gross and net Calorific value of coal sample having the following composition. C=82%, H=3%, O=4%, S=4.5%, N=3.2% and ash 3.3%.
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What are the different mechanisms of lubricants? Discuss mechanism of Thick film Lubrication.
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What is Portland cement? Write the chemical reactions involved in setting and hardening of Cement.
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Write the classification and applications of composites.
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What are the characteristics of good refractory material?
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