JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech I Year CHEMISTRY Previous Question Paper (January/February - 2024 - R18)
Note: Part A is compulsory (25 marks). In Part B, answer any one question from each unit (10 marks each).
Part A
Define atomic and molecular orbitals.
Answer
- Atomic Orbital: A mathematical function describing the wave-like behavior of an electron in an atom, representing the region in space where the probability of finding an electron is maximum.
- Molecular Orbital: A region in a molecule where electrons are likely to be found, formed by the linear combination of atomic orbitals (LCAO) of the constituent atoms.
Draw molecular orbital diagram of F2.
Answer
The molecular orbital configuration of F2 (18 electrons) is: σ1s2, σ*1s2, σ2s2, σ*2s2, σ2pz2, π2px2 = π2py2, π*2px2 = π*2py2.
Energy | (F) (F2) (F) | 2p σ*2p 2p | π*2p | 2s π2p 2s | σ2p | σ*2s | σ2s | σ*1s | σ1s
Define Temporary and Permanent hardness of water.
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Write a note on Caustic embrittlement.
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Write a short note on Galvanic cells.
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Explain Electro less plating of Nickel.
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What is Grignard’s Reagent? Write the addition of Grignard’s reagent on Carbonyl compounds.
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Write the synthesis and application of Paracetamol.
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Write the principle involved in NMR spectroscopy.
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Explain magnetic resonance imaging.
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Part B
Discuss in detail the concept of LCAO. Draw the molecular orbital diagram of N2 molecule and calculate bond order and predict its magnetic behavior.
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Describe the crystal field theory for d-orbitals splitting in tetrahedral complexes of the transition metals with suitable examples.
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Describe the de mineralization of water by ion exchange method.
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Discuss Reverse Osmosis Method.
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What is the principle involved in internal treatment method and discuss in detail Calgon conditioning and Phosphate Conditioning.
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Explain the process of Scale and Sludge formation in boilers.
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What is reference electrode? Discuss the construction and PH calculation of unknown solution using calomel electrode.
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What is Oxidation Corrosion and how does it take place? Describe the mechanism of Oxidation Corrosion.
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What happens when a Zn plate is fixed below a ship and why is it fixed?
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Explain addition of HBr to Propene with Markownikoffs and Anti Markownikoffs rule.
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Discuss the mechanism of reduction in Carbonyl compounds using NaBH4.
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Describe the differential conformational isomers of n-butane with a neat diagram. Explain why staggered conformer is more stable than anti conformer.
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Discuss the different types of electronic transitions that occur in Organic molecules on absorption of U.V Spectra.
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What are the Selection values in IR Spectroscopy? List out applications of IR Spectroscopy.
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