JNTU
JNTU B.Tech I CHEMISTRY Previous Question Paper (May/June - 2019 - R18)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
What is band structure of solids.
Answer
The band structure of a solid describes the range of energy levels that electrons within the material are allowed to occupy, and the gaps between these ranges where electrons cannot exist. It arises from the overlapping of atomic orbitals in a crystal lattice, which causes discrete atomic energy levels to broaden into continuous energy bands. The two most significant bands are the valence band, which is fully or partially occupied by electrons, and the conduction band, which lies at a higher energy level. The separation between these bands, known as the forbidden energy gap, determines the electrical conductivity of the material, classifying it as a conductor, semiconductor, or insulator.
How is portable water disinfected by ozonation?
Answer
Ozonation is a process where ozone (O3) gas is bubbled through water to disinfect it. Ozone acts as a powerful oxidizing agent that destroys bacteria, viruses, and other microorganisms by oxidizing their cellular components, such as proteins and lipids, effectively killing them or rendering them inactive. Unlike chlorination, ozonation does not leave behind harmful chemical residues or impart an unpleasant taste or odor to the water.
What is standard electrode potential?
Answer
Sign in to view the complete answer paper.
What is specific rotation?
Answer
Sign in to view the complete answer paper.
What is nuclear magnetic resonance?
Answer
Sign in to view the complete answer paper.
Give the molecular energy diagrams of O2.
Answer
Sign in to view the complete answer paper.
What is Caustic embrittlement?
Answer
Sign in to view the complete answer paper.
Why small anodic area undergo intense corrosion?
Answer
Sign in to view the complete answer paper.
Explain Grignard addition on carbonyl compounds.
Answer
Sign in to view the complete answer paper.
State and explain Lambert-Beer law.
Answer
Sign in to view the complete answer paper.
Part B
Explain the bond order in N2 molecule.
Answer
Sign in to view the complete answer paper.
Discuss briefly the molecular orbital theory?
Answer
Sign in to view the complete answer paper.
Give the crystal field splitting pattern of d-orbitals in octahedral geometry.
Answer
Sign in to view the complete answer paper.
What are the differences between bonding and antibonding orbitals?
Answer
Sign in to view the complete answer paper.
What are the salient features of crystal field theory?
Answer
Sign in to view the complete answer paper.
Give the crystal field splitting pattern of d-orbitals in tetrahedral geometry.
Answer
Sign in to view the complete answer paper.
Explain the principle involved in the complexometric method of determination of the hardness of water.
Answer
Sign in to view the complete answer paper.
Explain the disinfection of water by Chlorination.
Answer
Sign in to view the complete answer paper.
Give the Ion-exchange process for softening of hard water.
Answer
Sign in to view the complete answer paper.
What are the disadvantages of boiler corrosion? Explain how such corrosion is prevented.
Answer
Sign in to view the complete answer paper.
What is hardness of water? Give the various units of hardness.
Answer
Sign in to view the complete answer paper.
Calculate the temporary, permanent and total hardness of water sample containing following impurities: Mg(HCO3)2=16.8mg/L, MgSO4=24.0mg/L and NaCl = 58.5 mg/L.
Answer
Sign in to view the complete answer paper.
Describe the construction and working of standard calomel electrode.
Answer
Sign in to view the complete answer paper.
What is corrosion? Explain the theory of chemical corrosion.
Answer
Sign in to view the complete answer paper.
Derive Nernst equation.
Answer
Sign in to view the complete answer paper.
What is a battery? Explain the functioning of Li ion battery.
Answer
Sign in to view the complete answer paper.
Explain the factors affecting the rate of corrosion.
Answer
Sign in to view the complete answer paper.
What is electrochemical series? Give its applications.
Answer
Sign in to view the complete answer paper.
Describe the conformational isomers of n-butane.
Answer
Sign in to view the complete answer paper.
Explain the mechanism of dehydro halogenation of alkylhalides.
Answer
Sign in to view the complete answer paper.
Discuss reduction of carbonyl compounds using LiAlH4.
Answer
Sign in to view the complete answer paper.
Write the possible optical isomers in tartaric acid.
Answer
Sign in to view the complete answer paper.
Explain the nucleophilic substitution reaction mechanism.
Answer
Sign in to view the complete answer paper.
Discuss oxidation mechanism of alcohols using KMnO4.
Answer
Sign in to view the complete answer paper.
What is meant by shielding and deshielding of a proton nucleus?
Answer
Sign in to view the complete answer paper.
Explain the principle of UV spectroscopy.
Answer
Sign in to view the complete answer paper.
Explain the applications of IR spectroscopy.
Answer
Sign in to view the complete answer paper.
Explain the principle of NMR spectroscopy.
Answer
Sign in to view the complete answer paper.
Why methane does not absorb IR energy.
Answer
Sign in to view the complete answer paper.
What are different electronic excitations in UV spectroscopy?
Answer
Sign in to view the complete answer paper.