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

Questions asked in this paper

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1. Q2 Figure to the right indicate full marks
2. Q3 Use of log-table nonprogrammable calculator is allowed
3. Q4 Answer for the same question as for as possible should be written together
   • A) Select the correct option and complete the following sentences (Attempt any twelve) 12
4. Q1 is an intensive property of the system
   • a) Mass
   • b) Density
   • c) Volume
   • a) Internal energy
   • b) Work done
   • c) Entropy
   • iii) An endothermic reaction accurs with
   • a) evolution of heat
   • b) absorption of heat
   • c) nochange in heat content
   • iv) The variation is enthalpy of a reaction with temperature is given by
   • a) equation
   • b) Hess law
   • v) solution means
   • a) decinormal solution
   • c) seminormal solution
   • vi) The amount of solute present in the given amount of
   • a) concentration
   • b) molality
   • c) molarity vil) are the particles which are electrically neutral
   • a) Protons
   • b) Neutrons
   • c) Electrons vili) 3s orbital has radial node
   • ix) is an example of hydrogenic atom
   • a) He
   • b) He
   • x) The enthalpy of ionisation with increase in atomic size
   • a) increases
   • b) decreases
   • c) remains the same
   • xi) Rb is the member of group
   • a) Cl xili) In acetone, oxygen is hybridised
   • xiv) Carbon-carbon bond length is minimum in bond
   • a) triple
   • b) double
   • c) single XV) is non-polar molecule
   • a) CCl4 is nucleophilic reagent
   • a) alcohol
   • b) aldehyde
   • c) ketone Dehydrogenation reaction is an example of reaction
   • a) addition
   • b) substitution
   • c) elimination
5. Q1 B whether the following sentences are true or false. (Attempt any three.) 3 marks
6. Q1 Volume is an extensive property of the system
   • ii) The unit of mole fraction is moles/kg iil) Is orbital has one node
   • iv) 5f block elements are called actinide elements Nucleophiles are electron deficient species
   • vi) Inductive effect is permanent effect C Match the following (Attempt any five) 05
   • i) First law of thermodynamics
   • e) per million Attempt any four of the following
   • A) Define thermodynamic terms system and surrounding. Explain different types of systems 05 with suitable example
   • B) Explain the terms. 05
   • C) Three moles of an ideal gas at 8.0 atmosphere and are converted to 2.0 atmosphere at 05 Find change in internal energy & change in enthalpy of the system
   • D) Explain molar heat capacity & derive relationship between Cp & Cy. 05
   • E) How will you interconvert normality to molarity & molality to mole fraction? Explain. 05
   • F) What is the weight of solute dissolved in 400 cm? of 2M (Mol. wt.= 138.2) 05
7. Q3 Attempt any four of the following
   • A) Discuss the limitations of Bohr’s atomic model. 05
   • B) Explain Rutherford’s atomic model. 05
   • C) Calculate effective nuclear charge for 4s electrons of potassium. Atomic number of K 05
   • D) How does atomic & ionic radii affect on chemical behavior of an elements. 05
   • E) Write a note on electron gain enthalpy. 05
   • F) Describe quantitative measurement of electronegativity by Mulliken’s method. 05
8. Q4 Attempt any four of the following
   • A) Write IUPAC name of the following compounds 05
   • B) Explain sp?-hybridisation of nitrogen with suitable example. Draw orbital diagram of HCN. 05
   • C) What are carbanions? Discuss the shape & structure of carbanion. 05
   • D). Explain stability of free radicals on the basis of hyperconjugation & resonance effect. 05
   • E) i) Explain hybridization of oxygen with suitable example 03
   • ii) Explain: Acetic acid is weaker than monochloro acetic acid. 02
   • F) 1) Draw the structure of the following compounds 03
9. Q11 Indicate the type of hybridization of C, O atoms in acetic acid. 2 marks
10. Q5 Attempt any four of the following
    • A) Explain the term enthalpy & drive the relation between change in enthalpy & change in 05 internal energy of the system
    • B) Determine the mole fraction of both components in a solution containing 36.0 g of water & 05 46 g of glycerine (C3Hs
    • C) Write a note on Aufbau principle. 05
    • D) Explain the periodic trends in atomic & ionic size of elements in periods. 05
    • E) i) Discuss the orbital structure of ethene. 03
    • ii) Explain the term electrophiles with suitable examples. 02
    • F) Give an account of electromeric effect. 05

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