JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year CHEMISTRY Previous Question Paper (March/April - 2023 - R18)
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 the term ligand. Give examples.
Answer
A ligand is an ion or a neutral molecule that possesses at least one lone pair of electrons, which it donates to a central metal atom or ion to form a coordinate covalent bond in a coordination complex. Examples include neutral molecules such as water (H2O) and ammonia (NH3), and anions such as the chloride ion (Cl-) and cyanide ion (CN-).
Calculate the bond order N2.
Answer
The nitrogen molecule (N2) consists of 14 electrons. According to the molecular orbital theory, the electronic configuration is: σ1s2, σ*1s2, σ2s2, σ*2s2, π2px2 = π2py2, σ2pz2.
The number of bonding electrons (Nb) is 10, and the number of antibonding electrons (Na) is 4.
Thus, the bond order of N2 is 3, indicating a triple bond between the two nitrogen atoms.
What is calgon conditioning? Write the reaction involved.
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How many grams of FeSO4 dissolved per litre gives 210.5 ppm of hardness.
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Give two factors affecting the rate of corrosion.
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What is electro less plating? Explain briefly.
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How is aspirin synthesized? Write its applications.
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What is optical activity? Write the number of Enantiomers possible for Lactic Acid.
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What is the role of TMS (Tetramethylsilane) in NMR spectroscopy?
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Methane does not absorb IR radiations. Why?
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Part B
Explain the crystal field splitting of d-orbital’s in Square planar complexes.
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Draw and explain the π-molecular orbital’s of Benzene molecule.
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What is Crystal Field Theory? Write the salient features of CFT.
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Discuss the crystal field splitting of d-orbital’s in tetrahedral complexe.
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Write the causes and effects and preventive methods for caustic Embrittlement in boiler feed water.
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Write the principle involved in Reverse osmosis? Explain the desalination of Brackish water by Reverse Osmosis method.
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What are the specification of Potable water? Write two methods of disinfection of Drinking water.
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A water sample on analysis gave the following data: CaSO4 = 60 mg/l, Mg (HCO3)2 = 74 mg/l, CaCl2 = 24 mg/l, NaCl = 5mg/l, MgCl2= 20mg/l. Calculate Temporary, Permanent and Total hardness in degree Clark units.
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Explain with a neat diagram the construction and working of Calomel electrode.
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What is cathodic protection? Discuss the sacrificial anodic method of protection of metals.
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Describe the construction and working of Lithium ion battery.
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Write the mechanism of electrochemical corrosion by taking the example rusting of iron.
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Explain the terms: Geometrical isomerism and Diastereomers with examples.
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Discuss the mechanism of Markownikoff and anti Markownikoff’s addition reaction of HBr to propene.
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What is Grignard reagent? Discuss the mechanism of addition of Grignard reagent to on carbonyl compounds.
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Discuss the reduction of carbonyl compounds by using LiAlH4 and NaBH4 reagents.
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Write the principle of UV-Visible spectroscopy. What type of compounds absorb UV- radiations? Give examples.
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Write the stretching frequencies of the following functional groups in IR spectroscopy: i) R-CHO ii) R-CH2NH2 iii) R--OH
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How do you distinguish the following compounds, cis-stilbene and Trans stilbene Compounds by UV spectroscopy.
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Write the principle of H1NMR spectroscopy. Write the important application of NMR spectroscopy.
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