BSc Biochemistry Sem I 2018 19 Dec 2018-19 CHEMISTRY PAPER I Question Paper - Mumbai University | munotes

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1. Q1 All questions are compulsory
2. Q2 Figures to the right indicate full marks
3. Q3 Use of logtable non-programmable calculator is allowed
4. Q4 Answers for the same question must be written together
5. Q1 A) Select the correct option and complete the following. (Attempt Any twelve) 12 marks
   • ii) The Kirchhoff’s equation is
   • b) (AH, — = AC, (T2 Molar heat capacity is
   • a) extensive property b) intensive property c) neither ‘a’ or
   • iv) is not a state function
   • v) The number of moles present in 18g of water is
   • a) one b) 18 c) 1.8
   • vi) Equivalent weight of acting as an oxidant in acidic medium is
   • a) half of its molecular mass b) one fifth of its molecular mass
   • c) same as its molecular mass
   • vii) According to Quantum theory E =
   • a) he b) hv c)
   • viii) For an electron if m; =+1,0,-1 then electron is present in
   • ix) The fine spectra of hydrogen atom are explained by theory
   • x) The elements after uranium are called elements
   • xi) The general electronic configuration of an inert elements is proposed the rules for calculating shielding constants Prefix of group in IUPAC nomenclature is
   • xiv) Hybridization of in dimethyle ether is
   • xv) Nucleophiles are species
   • c) electron accepting
   • xvi) The bond angle of carbon in methanol is The percentage of s character is maximum in hybridized species Xviii) Eelctromeric effect is a effect
   • B) State whether the following statements are True or False. (Attempt any three) 03
   • i) Work is a function and dw is exact differential
   • ii) Molarity of a solution is the number of moles of solute per kg of solvent
   • iii) The shell with n=3 is represented as k
   • iv) According to Pauling the electronegativity difference between two atoms is 0.0886
   • vi) IUPAC name of CH3COO is ethyl methanoate
   • C) Match the following. (Attempt any five) 05
6. Q2 Attempt any four of the following
   • A. State first law of thermodynamics in any three form. Give any two limitations of it. 05
   • B. Define thermodynamic term system and surrounding. Explain different types of 05
   • C. Define the thermodynamic term ‘boundary’. Calculate the work done, when 1.5 moles 05 of an ideal gas are expanded isothermally and reversibly at 298K to twice the original
   • D. Explain the i) Enthalpy Internal energy. How are they related? 05
   • E. Define the following terms: 05
   • F. What is the weight of solute dissolved in 0.5L of 0.1M AICl3 (Mol. wt 133.5)? 05
7. Q3 Attempt any four of the following
   • A. What is a node? Discuss the angular shape of any one orbital? 05
   • B. Explain principal quantum number ‘n’ and orbital angular momentum (1). 05
   • C. Discuss penetration and shielding in orbitals. 05
   • D. Explain all periods with their elements in the long form of the periodic table. 05
   • E. Write a note on effects of atomic and ionic radii on elements. 05
   • F. Define electron gain enthalpy and explain factors affecting it. 05
8. Q4 Attempt any four of the following
   • A. Give IUPAC names of the following. 05
   • B. Identity the type of hybridization of in 05 Describe the structure with a orbital diagrams
   • C. Distinguish between sp and sp? hybridization. 05
   • D. i) Identify which of the following is a stronger base. Give reasons for your answer. 03 ui) Explain why pi bonds are more reactive than sigma bonds. 02
   • E. Draw the structure of primary, secondary and tertiary carbanions. Compare their 05
   • F. Draw structures for the following. 05
9. Q5 Attempt any four of the following
   • A. Explain enthalpy of combustion and give its applications. 05
   • B. If lead content in Venegar is 0.2mg/L, how much is that in parts per billion. 05
   • C. Calculate the effective nuclear charge of the last electron in an atom whose 05
   • D. Discuss Mulliken’s method for calculating electronegativity of elements. 05
   • E. Explain Inductive effect. Using suitable examples. Explain its effect on acid strength. 05
   • F. i) Distinguish between homolytic and heterolytic fission. 04 Give an example of a substitution reaction. 01

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