BSc Chemistry SEM I 2018 19 2018-19 Chemistry I Question Paper - Mumbai University | munotes

Questions asked in this paper

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• 2. Figures to the right indicate full marks

1. Q3 Use of log-table/non programmable calculator is allowed
2. Q4 Answers for the same question as for as possible should be written together
3. Q1 (A) Select the correct option and complete the following sentences. (Attempt any twelve) 12 marks
4. Q1 Asystem which exchange only energy with the surrounding but not the matter is called
   • ii) is not a state function
   • iii) The molar heat capacity at constant volume, Cv =
   • iv) The enthalpy of combustion of a substance is
   • a) always positive b) always negative c) always equal to
   • v) 0.1 N solution means
   • vi) Solutions are examples of The shell with n = 1 is The charge of the alpha particles is
   • ix) Louis de-Broglie’s relation is
   • x) period, there elements x1) All VILA group elements are called elements
   • xii) Greater the charge on nucleus of an atom will be the attraction between nucleus and outer most electrons
   • xiii) In methanol, oxygen is hybridized
   • xiv) The carbanion is species
   • xv) Ethanamide has carbon
   • xvi) Unit of dipole moment is Xvii) The carbanion has _ shape Xviii) Alkaline hydrolysis of alkyl halide is an reaction
   • a) elimination b) addition c)
   • B) State whether the following sentences are true or false. (Attempt any three) 03
5. Q1 The properties which depend on the amount of a matter are called extensive properties
   • ii) A solution which contain | mole of solute dissolved in 1000 cm? of water is designated Electron enters in shells in the order of decreasing energy
   • iv) The horizontal rows of long form of periodic table are called groups
   • v) Phenol is more acidic than acetic acid
   • vi) Sigma bonds are stronger than
   • C) Match the following (attempt any five) 05
6. Q3 Number of electrons in p — orbital c) U+PV Bond length between in parts per billion
7. Q2 Attempt any four of the following
   • A) Explain the concept of heat and work in thermodynamics along with it’s sign 05
   • B)i) Distinguish between endothermic and exothermic reactions. 03
   • ii) Explain the term path function 02
   • C) Calculate change in internal energy and change in enthalpy of a system when 96 g of 05 oxygen is heated from to
   • D) Derive Kirchhoff’s equation. Give it’s applications. 05
   • E) Define equivalent weight. Explain equivalent weight with respect to redox reactions. 05
   • F) In 250.cm? of 0.12 N of what is the weight of H2SO4? 98) 05
8. Q3 Attempt any Four of the following
   • A) Give Slater rules for shielding constant. 05
   • B) Define the terms shells, subshells and orbitals. 05
   • C) Discuss the limitations of Bohr’s atomic model. 05
   • D) Discuss electronegativity of elements determined by Alfred and Rochow method 05
   • E) Explain the periodic table with reference to f blocks elements. 05
   • F) What is ionization enthalpy? 05
9. Q4 A) Write IUPAC name of the following compounds. 5 marks
   • B) Explain sp” hybridization of oxygen with suitable example. Draw orbital picture of dimethyl
   • C) What are carbocations? Discuss the structure and shape of carbocation. 05
   • D) What are free radicals? Explain stability of benzyl radical on the basis of resonance. 05
   • E) i) Explain sp?- hybridization of carbon with suitable example. 03
   • ii) Alcohols are weak acids as compared to carboxylic acids, Explain. 02
   • F) i) Draw the structure of the following compounds. 03 Indicate type of hybridization of C and O atoms in formaldehyde. 02
10. Q5 Attempt any four of the following
    • A) State first law of thermodynamics in any three forms. Give any two limitations of it. 05
    • B) Define Molarity. Calculate the molarity of the solution when 9.8 g of is 05 dissolved in 100 cm? of water
    • C) Explain the distribution curve for radial wave function of 1s and 2s orbital. 05
    • D) What is effective nuclear change, explain in brief 05
    • E) Discuss stability of carbanion on the basis of inductive effect and ‘s’ character. 05
    • F) Discuss orbital structure of Ethyne. 03 Give one example each of addition and eliminations reactions. 02

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