1. Write the postulates of Bohr’s model of a hydrogen atom? Discuss the importance of this model to explain various series of lines spectra in the hydrogen atom.
  2. How are quantum numbers n, l , m, s arrived, and explain the significance of these quantum numbers?
  1. Write an essay on the division of elements into s, p, d, and f blocks.
  2. What is a periodic property? How the following properties vary in a group and in a period? explain.
    1. Atomic radius
    2. Electron gain enthalpy
    3. Ionization enthalpy
    4. Electronegativity
  3. Define IE1 and IE2. Why is IE1 > IE2 for a given atom? Discuss the factors that affect the IE of an element?
  1. Explain the formation of ionic bonds with suitable examples.
  2. Explain the factors favorable for the formation of ionic compounds.
  3. Give an account of VSEPR Theory and its applications.
  4. What do you understand by hybridization? Explain different types of hybridization involving s and p orbitals.
  5. Give the molecular orbital energy diagram of N2 and O2. Calculate the respective bond order. Write the magnetic nature of N2 and O2 molecules.
  1. Describe two methods of preparation of ethylene. Give the equation for the reactions ethylene with the following
    1. Ozone
    2. Hypohalous acid
    3. Cold and dil.alk KMnO4
    4. Heated with O2 at high pressures
  2. Give two methods of preparation of acetylene. How does it react with water and ozone?
  3. How does acetylene react with the following reagents? Give the corresponding equation and name the products formed in the reactions.
    1. Acetic acid
    2. Water
    3. Hydrogen
    4. Halogen
    5. Hydrogen halide
    6. Ammonical AgNO3 and CuCl2



  1. Even though nitrogen in ammonia is in sp3 hybridization. The bond angle deviates from 109028′ explain.
  2. Explain the hybridization involved in the PCl5 molecule.
  3. Explain the hybridization involved in the SF6 molecule.
  4. What is a hydrogen bond? Explain the different types of hydrogen bonds with examples.


  1. State and explain graham’s law of diffusion?
  2. Deduce boyl’s law and charle’s law from kinetic gas equation?
  3. Deduce graham’s law and Dalton’s law from kinetic gas equation?
  4. Derive an expression for kinetic gas molecules.


  1. Chemical analysis of a carbon compound gave the following percentage composition by weight of the elements present.
    • Carbon = 10.06%
    • Hydrogen = 0.84%
    • Chlorine = 89.10% Caliculate the empirical formula of the compound?
  2. A carbon compounds contains 12.8% “C” , 2.1 % “H” , 85.1% “Br” . The molecular weight of the compound is 187.9 caliculate the molecular formula?
  3. What volume of CO2 is obtained at STP by heating 4g of CaCO3?
  4. Calculate the oxidation number of sulfur, chromium, and nitrogen in
    • H2SO5,Cr2O7-2
    • Cr2O7-2
    • Cr2O3
    • NO3
    • K2Cr2O7
  5. Write the balanced equation for the oxidation of sulfite ions to sulfate ions in the acid medium by permanganate ion?


  1. Define heat capacity .what are are Cp and Cv ?show that Cp -Cv = R
  2. State and explain the Hess law of constant heat summation
  3. What is entropy? explain with examples?


  1. Derive the relation between Kc and Kp for the equilibrium reaction
    • N2(g) + 3H2(g) <—–> 2NH3(g)
  2. What are Le chatelier’s principles? discuss briefly the factors which can influence the equilibrium
  3. Discuss the application of Richa players principal for the industrial synthesis of ammonia and sulfur trioxide.
  4. Explain Lewis acid-base theory with suitable examples. Classify the following into Lewis acids, lewis base, and show these acts as Lewis acid-base.
    • OH
    • F
    • H+
    • BCl3

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