BSc Sem I 2017 2018 2018 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 Figures 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) For exothermic reaction enthalpy change is
   • ii) The normality of 1M is
   • iii) State functions are
   • iv) Enthalpy is
   • v) The azimuthal quantum number of 3P electron is
   • vi) The number of radial nodes for 3S orbital is
   • vii) lonisation enthalpy of elements across the period
   • viii) De Broglie wavelength of an electron is given by equation
   • ix) The +I effect
   • x) Benzyl
   • xi) Carbon-Carbon bond length is maximum bond
   • xii) are electron deficient species
   • B) State whether the following statements are True or False: 03
   • i) Number of millimoles is equal to volume in cm? multiplied by molarity
   • ii)’ No. two electrons can have all four number same in a given atom Helerolytic fission results in formation of free radicals F691584A4BE2D03B98D5 1 BFBE142EA4D
   • Q.P. Code : 12156
   • C) Match the following columns: 05
   • i. 20 ppm a. R-OH
   • ii. process b. 32
   • iii. Groups in the periodic table Ap=0
   • iv. Number of elements in period d. 18
5. Q2 A) i) Explain the terms 5 marks
   • a) Enthalpy of Formation
   • b) Enthalpy of Combustion
   • ii) Define heat capacity at constant volume. Calculate the value of AE on heating 3 moles of oxygen from 03 to Given Cv = 20.92
   • A) i) What is standard state? 05 The heat of a certain reaction Is -92000 J at 300 K. What its value at 333 K? Given ACp =
   • ii) State the first law of thermodynamics. State its any one limitation. 03
   • B) i) Calculate the amount of heat-necessary to raise the temperature of 180 g water from to 05 Molar heat capacity of water is 75.3 J At.Wt. of
   • ii) Calculate the weight of the following substances that will be required to prepare 03
   • a) 500cm? of 0.1N solution
   • b) 600cm? of 0.15N Na2CO3 solution 700cm? of 0.1N solution
   • B) i) Define work. 05 Calculate q, w and AE when two moles of monoatomic gas expand adiabatically against constant external pressure of 2 atm from a volume of 2dm? to 14dm? at 303 K
   • ii) 14g of KOH is dissolved in 1dm? of solution. Calculate molarity of solution K = 39,0 =16,H=1 03
   • C) i) Define 02
   • ii) Define the terms 02
   • a) milliequivalent b) Molality F691584A4BE2D03B98D5 1 BFBE142EA4D
   • Q.P. Code : 12156
   • C) i) Define 02
   • ii) Differentiate between ppm & ppb 02
6. Q3 A) i) Explain Rutherford’s model of atom based on alpha particle scattering experiment. 5 marks
   • ii) What are hydrogenic species? Give two examples. Explain their significance in developing quatum models. 03
   • A) i) Plot and explain radial probability distribution curve of 2S electron. 05
   • ii) Explain any two drawbacks of Bohr’s atomic model. 03
   • B) i) What is Pauling’s definition of electronegativity? Explain variation in electronegativity of elements 05 across the period and down the group
   • ii) Calculate the effective nuclear charge felt by 2P electron in oxygen atom (Atomic number 8) 03
   • B) i) What is meant by atomic radius? Explain its variation across the period and down the group. 05
   • ii) State modern periodic law. What are the types of elements in the long form of periodic table? 03
   • C) Distinguish between and 04
   • C) Explain Lyman and Balmer series of spectral lines observed in atomic spectrum of hydrogen. In which 04 spectral regions are the lines observed?
7. Q4 A) i) Give IUPAC names of the following compounds 5 marks
   • i) — CH2— CHO O
   • iii) iv)
   • ii) Explain orbital structure of ethane. 03 F691584A4BE2D03B98D5 1 BFBE142EA4D
   • Q.P. Code : 12156
   • A) i) Write the structures of the following 5
   • a) Ethoxy ethane
   • b) Butan-2-one
   • d) Propyne
   • e) Petanoic acid
   • ii) Indicate the type of hybridization of C, N, O atoms in CH3CONH2 03
   • B) i) Explain lewis concept of acids and bases with a suitable example for each. 05
   • ii) Name three types of organic reactions and give one example for each. 03
   • B) i) Give structure with geometry, bond angle and hybridization of carbocation. 05
   • ii) Explain the terms-electrophile and nucleophile with a suitable example for each. 03
   • C) Give IUPAC names of the following compounds 4
   • C) Draw structures for the following compounds 4
   • i. 1,3-cyclopentadiene
   • ii. Cyclopentanamine
8. Q5 Attempt any four of the following:
   • A) Explain the terms: 05
   • B) Asolution containing 13.0g of oxalic acid per 500cm? of solution has a density of Calculate the 05 mole fraction of oxalic acid. Molecular weight of oxalic acid = 126. Molecular weight of water = 18
   • C) Draw and explain shapes of S and p orbitals. 05 Explain Heisenberg uncertainty principle, using its mathematical expression. 05
   • E) Explain inductive effect 05
   • F) What is sp? hybridisation? Explain sp? hybridization of carbon in methane. 05 F691584A4BE2D03B98D5 1 BFBE142EA4D

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