BSc Biochemistry Sem I ATKT 2017-18 Bio Chem Chemistry I Question Paper - Mumbai University | munotes

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1. Q2 Answer to the same question must be written together
2. Q3 Figure to the right indicate full marks
3. Q4 Use of non-programmable calculator is allowed
4. Q1 A) Select the correct option and complete the following sentences. 12 marks
   • a) b)An=0
   • ii) The normality of 0.1M NaCl solution is
   • iii) Which of the following is an intensive property
   • a) Volume
   • iv) If work is done by the system then w is taken as
   • v) Half filled and completely filled orbitals are stable
   • a) not b) more c) less
   • vi) The radial wave function gives the of the orbitals
   • vii) Splitting of the spectral lines in presence of magnetic field is called
   • viii) Shielding constant is calculated using rules
   • x) Phenol is more than alcohol
   • xi) electrons are present in valence shell of nitrogen atom
   • xii) Un is electron rich species which donates electrons to electron deficient species
   • a) b) Acid Nucleophile
   • Q.P. Code :19995
   • B) State whether following statements are True or False. 03
   • i) Mole fraction is a volume basis method of expressing concentration
   • ii) Hydrogenic species have only one electron
   • iii) Pi - bond is formed by overlapping of P-P orbitals
   • C) Match the following columns 08
   • a) i) State function
   • b) Primary amines ii) low enthalpy of ionization
5. Q2 A) 1) Explain the terms 5 marks
   • b) Resonance Energy Il) Define enthalpy. 03 Calculate AH for the reaction Given AE = —59.4 K.J at 298 K ) What is standard enthalpy of formation? Calculate standard enthalpy of formation of benzene 05 Il) State and-explain zeroth law of thermodynamics. Explain why is it called so ? 03
   • B) Calculate the value of AH and AE for the reversible isothermal evaporation of 198 g of water vapour Given: heat of evaporation of water =2258.1 Il) 40 g of glucose is dissolved in 300 g of water. Calculate mole fraction of glucose in the solution 03 molar mass of glucose = 180
   • i) Calculate the amount of heat necessary to raise the temperature of 216g of water from 05 Molar heat capacity of water = k At. Wt. of H=1, 0=16
   • Q.P. Code :19995
   • ii) Calculate the weight of the substances that will be required to prepare 400 cm? of 0.3.N solution of 03 each of the following
6. Q1 Ni Cl, .6H,0
   • C) i) Define a) process 02
   • ii) With respect to concentrations of solutions explain the terms 02
   • a) Weight Volume (w/v)
   • b) Volume volume (v/v)
   • i)Define a) Adiabatic process 02
   • b) Extensive property
   • ii)Explain the term 02
7. Q3 i) Explain postulates of Bohr’s theory of atomic structure 5 marks
   • ii) Plot and explain radial probability distribution curve of 1s electron. Calculate radial node for 1s 03
   • i) What are the conditions a wave function should satisfy in order to be acceptable? 05
   • ii) An atom of an element contains 20 electrons and 20 neutrons Deduce a) the number of protons b) atomic mass and c) the electronic configuration of the 03
   • B) What is Pauling’s definition of electronegativity? Calculate electronegativity of Pb Allred 05 method. (Given— Atomic number of Pb = 82 Shielding constant of Pb = 76.35 Covalent radius of Pb = 1.53
   • ii) Why are cations smaller and anions larger in size as compared to their parent atoms? 03
   • i) What are main group and inner transition elements? Explain with suitable examples. 05
   • ii) Why do halogens show higher electron gain enthalpy values? 03
   • C) Explain main drawbacks of Rutherford’s atomic model. 04 What is meant.by dual nature of an electron ? Calculate wave length of an electron of mass 9.1 X 04 kg moving with velocity 800 m.s~+ (Given h=6.26 x Js )
   • Q.P. Code :19995
8. Q4 i) Write IUPAC names to following 5 marks
   • ii) Explain why ammonia has pyramidal shape with a bond angle of 03
   • i) Draw the structures for following 05
   • a) Pentane - 2,3 - diene
   • b) Ethanol
   • c) 1,2 Ethane
   • d) Pentanoic acid
   • e) Methyl Methanoate
   • ii) Indicate types of ‘O’ atom of following compounds. 03
   • a) OH
   • B) i) Explain the effect of hybridization.on following bond properties of molecules considering example of 05
   • a). Shape of molecule
   • b) Bond angle
   • c) Bond multiplicity
   • d) Bond Length
   • ii)Give an example of each of following reaction 03
   • a) Addition Reaction
   • b) Elimination Reaction
   • c) Substitution Reaction Draw resonance structures for 04
   • a) Vinyl Chloride
   • b) Acetamide
   • Q.P. Code :19995
   • ii) Distinguish between resonance and hyper conjugation. 04
   • C) Give IUPAC names for the following. 04 iv)
   • C) Draw the structures for following 04
   • i) 2-amino butane
   • iv) Ethanamide Attempt any four of the following 05
   • A) Explain the terms
   • a) Standard states Enthalpy of combustion
   • B) Calculate the normality & molarity of the solution containing 20.2 g of succinic acid 05 dm? of the solution. Molar mass of succinic acid = 118.09
   • C) Explain the terms shell, subshell and orbital. Write the values of shell, subshell and orbitals for a 3d 05
   • Q.P. Code :19995
   • D) Explain in brief recording of hydrogen spectrum. Name different series of spectral lines observed in 05
   • E) What is carbocation? Explain its shape with suitable example. 05
   • F) Why monochloro acetic acid is stronger acid than acetic acid. Explain with structures. 05

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