BSc Biochemistry Sem I ATKT 2017-18 ATKT FYBio 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 Figures to the right indicate full marks
3. Q4 Use of non-programmable calculator is allowed Select the correct option and complete the following sentences. (12)
   • i) Change in enthalpy when one mole of compound is formed under standard conditions is called enthalpy
   • ii) 10mg per dm? is solution
   • iii) AH > AE When
   • a) An <o b) c) An
   • iv) The molar heat capacity at constant volume is equal to
   • a) dH b). dE c)
   • v) form of periodic table the number of groups are
   • vi) According to quantum theory E= ,
   • a) he b) hu
   • vii) The shell with n = commonly referred to. as shell
   • viii) In ground state of an atom the the energy orbitals available to them IUPAC name of is
   • x) hybridization is present in
   • xi). Inductive effect is high in
   • xii) Carbocation has planar configuration with a bond angle of
   • Q.P. Code :00095 State whether the following statements are true or false. (3)
   • i) Formality is weight basis method of expressing concentration
   • ii) particles are positively charged
   • iii) In carbanion, trivalent carbon carries positive charge C Match the Following columns: (5)
   • i. State function a. homolytic fission
   • iv. Copper one. part in parts of one part in parts of
   • i) Explain the terms: 5
   • ii) Define enthalpy. Calculate the value of change in enthalpy on heating 96 g of oxygen from to Given: C, = Atomic weight of oxygen = 16 3
4. Q2 A_ i) What is enthalpy of combustion? Calculate the enthalpy of combustion of methane at and at one atmosphere pressure 5 marks
   • ii) State the first law of thermodynamics in any two forms. State its any one limitation. 3
   • i) Calculate g, w and AE for 3 moles of at 2 atm pressure which expands isothermally to 3.5 times of its initial volume against external pressure of 1 atm at 300 K 5
   • ii) Calculate the weight of the following substances that will be required to prepare 500cm?of 0.1molar solution. 3
   • Q.P. Code :00095 Define internal energy. (5) Four moles of an ideal gas at 10atm pressure and C are converted 2 atm. at C. Find AE and AH for
   • ii) Calculate the normality of solution containing 14 g per 500 cm?of solution. Define:- closed system b) work (2) 3
   • ii) Explain the term molality of a solution 2
   • i) Define:- a) isolated heat 2
   • ii) Explain the term milliequivalent. 2
5. Q3 A_ i) Why did Rutherford’s atomic model fail to explain stability of the atom? Explain the term stationary states based on Bohr’s atomic theory
   • ii) Write detailed electronic configuration of sodium (Atomic no. 11). What are the values of quantum 3
   • i) What are radial and angular nodes? How many radial nodes do 3p, 3d and 4f orbitals have? 5
   • ii) Explain radial distribution curve for 2s orbital with appropriate diagram. 3
   • B. i) What is Pauling’s definition of electronegativity? Explain variation in electronegativity values of elements. 5
   • a) across the period b) down the group
   • ii) What is covalent an atom? Calculate covalent radius of chlorine given that bond length of chlorine molecule is B Explain the term electron gain enthalpy. Why are electron gain enthalpy values of halogens so high? (5) 3
   • ii) Calculate the effective nuclear charge, felt by a 2p electron in oxygen atom. How does Bohr’s atomic model explain the atomic spectrum of hydrogen? (4) 3
   • Q.P. Code :00095 State and explain Heisenberg Uncertainty principle. (4)
   • i) Write IUPAC names of the following compounds: 5
   • ii) Describe hybridization of ethene molecule. A i) Give structures of the following compounds: (5) 3
   • a) pentan-1, 3-diene
   • c) Methoxy methane
   • e) cyclohexane
   • ii) Describe hybridization of ammonia molecule. Explain inductive effect in detail. (5) 3
   • ii) Give. an example each for addition, elimination and substitution reaction. Explain the following terms: (6) 3
   • a)Electrophilic reagents
   • b)Homolytic fission
   • c)Dipole moment
   • ii) Describe the structure of carbocation. 2
   • C. Write IUPAC names of following compounds: 4
   • Q.P. Code :00095
   • c) OH Give structures of following compounds: (4)
   • a) cyclopentene
   • b) n-propanol
   • d) 2-butene
6. Q5 Attempt any four of the following
   • A) Derive the relationship 5
   • B) 15 g of cane sugar is dissolved in 500. g of water. Calculate mole fraction of each component. Given: Molecular weight of cane sugar = 342, Molecular weight of water = 18 5
   • C) Explain dual nature of electron with reference to de Broglie equation. 5
   • D) Explain all four quantum numbers. 5
   • E) Explain relative stability of primary, secondary and tertiary carbanions. 5
   • F) How are sigma_and pi bonds formed? Why pi bond is weaker than sigma bond? 5

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