BSc Sem I 2017 2018 2018 CBZ Chemistry I Question Paper - Mumbai University | munotes

Questions asked in this paper

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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
   • i) State functions are
   • ii) 1 ppm solution of KCI contains
   • iii) Molar heat capacity is
   • iv) For endothermic reaction, enthalpy change is
   • a) Zero — Two
   • vi) In Layman series of hydrogen spectrum, the value of n, is
   • vii) The shape of P orbital is
   • viii) In ground state of an atom, the electron occupies the energy orbitals available to
   • a) Highest c) Middle
   • ix) Bond angle in methane molecule is
   • x) Carbon-carbon bond length is maximum in bond
   • a) Single
   • xi) The group exhibits effect
   • a) -C,H; c)-Cl
   • Q.P. Code :19993
   • B) State the following statements are true or false 03
   • i) When 30 g of HCl is present in 100g of solution then it is weight/volume method of
   • ii) Splitting of spectral lines under the influence of is called stark effect
   • iii) Triphenyl methyl radical is a stable radical
   • C) Match the columns. 05
   • a) Equivalent weight of in i)
   • c) Meg? iv) 158
   • d) Ar
5. Q2 A) i) Derive the equation AH, — AH; = — T,) where terms have their usual meaning 5 marks
   • ii) Define heat capacity at constant volume. Calculate the value of AE on heating 4 moles of oxygen 93
   • i) What is standard enthalpy of formation? Calculate the standard enthalpy of reaction 05
   • ii) State Zeroth law of thermodynamics. Why is it called so? 03
   • B) Two moles of an ideal gas at 10 atmosphere and converted to 2 atmosphere at . Find 05 AH for the change
   • ii)Calculate the weight of the following substances that will be required to prepare 500cm? of 0.2N 03 solution of each of the following
   • a). sugar ) (Given molar mass of cane sugar = 342.29 Molar mass of oxalic acid dihydrate = 126.064
   • Q.P. Code :19993
   • B) i) Define work. 05 Calculate q, w and AE when 3 moles of monoatomic gas expands adiabatically against constant external pressure of 2 atmosphere from a volume of 3dm? to 20dm? at 300K
   • ii). 20g of NaCl is dissolved in 500 g of water. Calculate mole fraction of water. 03 Molar mass of NaCl = 58.5
   • C) i) Define 02
6. Q1 Closed system
7. Q2 Isothermal process
   • ii).Explain the term millimoles
   • i) Define
8. Q1 Reversible process
9. Q2 Isobaric process
   • ii) Explain the term ppb 02
10. Q3 A) 1) Explain the term stationary orbits based.on Bohr’s postulates of theory of atomic structure. Give any two limitations of Bohr’s atomic model Il) An atom of an element contains 29 electrons and 35 neutrons. Deduce i) the numbers of protons 03 5 marks
    • ii) atomic mass and iii) the electronic configuration of the element
    • i) Why did Rutherford’s atomic model fail to explain stability of atom? 05
    • ii) What are hydrogenic species? Give two examples. 03
    • B) 1) State modern periodic law. Explain briefly classification of elements as main group andtransition 05 elements with two.examples of each Il) State factors influencing ionization enthalpy values. First ionization enthalpy of nitrogen is higher 03 than that of oxygen. Explain
    • i) Explain the term electronegativity of an element based on Pauling’s method. Calculate 05 electronegativity of chlorine based on Pauling’s method Given Electronegativity of Hydrogen =2.1 Resonance energy of HCl is 92.1 kJ
    • ii) Calculate effective nuclear charge experienced by a 3d electron in zinc. 03
    • Q.P. Code :19993
    • C) Fora 3d electron name four quantum numbers and write their all possible values. 04 State and explain Heisenberg uncertainty principle. 04
11. Q4 A) i) Write IUPAC names of the following compounds. 5 marks
    • ii). Discuss the orbital structure of ethene
    • i) Draw structures of the following compounds. 05
12. Q1 n-butane
13. Q2 Methyl cyclopentane
14. Q3 Propanone
15. Q4 Methyl 1- butanamine
    • ii) Explain sp? hybridisation of oxygen with suitable example. 03
    • B) Explain the relative acidities of mono, di and trichloroacentic acids on the basis of inductive effect 05
    • ii). Explain stability of benzyl radical on the basis of resonance. 03
    • i) Explain the following terms with examples 06
    • ii) Electrophiles
    • iii) Hypercojugation
    • ii) Give one example of following reactions 02
16. Q2 Reaction
    • Q.P. Code :19993
    • C) Write IUPAC names of the following compounds 04
    • D) Draw structures of the following 04
17. Q3 Pentanoic acid
18. Q4 Cyclopentanone
19. Q5 Attempt any four of the following
    • A) enthalpy of combustion? What.are its applications? 05
    • B) Calculate the molarity of the following solutions 05
    • a) 20g of in 1 dm? of solution
    • b) 9.5 g of in 700 cm? of solution Molar mass of = 249.68 Molar mass of = 262.85
    • C) What are the necessary conditions for a wave function to give physically acceptable solutions? 05
    • D) State Aufbau Principle. What is meant by electron spin? Write the quantum number and its possible 05 values which designate electron spin hybridization with suitable example. 05 of free radicals. 05

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