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Full Portion Three Marks Question Paper

11th Standard

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Chemistry

Time : 01:30:00 Hrs
Total Marks : 60
    20 x 3 = 60
  1. Calculate the amount of water produced by the combustion of 32 g of methane.

  2. Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wave length associated with the electron revolving arround the nucleus.

  3. What is water-gas shift reaction?

  4. How do you expect the metallic hydrides to be useful for hydrogen storage?

  5. Write a note about ortho water and para water.

  6. Mention the uses of plaster of paris

  7. Alkali metals have low melting and boiling point.Density of alkali metals is very low. Give reason.

  8. A sample of gas has a volume of 8.5 dm3 at an unknown temperature. When the sample is submerged in ice water at 0 °C, its volume gets reduced to 6.37 dm3. What is its initial temperature?

  9. How does the volume of a gas vary with temperature at constant pressure? Explain with the help of a plot between volume is temperature.

  10. Derive an expression for the efficiency of a heat engine.

  11. For the reaction,
    A2(g) + B2(g) ⇌ 2AB(g) ; ΔH is –ve.
    the following molecular scenes represent different reaction mixture (A – green, B – blue)

    i) Calculate the equilibrium constant KP and (KC).
    ii) For the reaction mixture represented by scene (x), (y) the reaction proceed in which directions?
    iii) What is the effect of increase in pressure for the mixture at equilibrium.

  12. Consider the reaction, N2(g) + 3H2(g) ⇌ 2NH3(g). Explain the effect of pressure on this equilibrium reaction.

  13. 0.24 g of a gas dissolves in 1 L of water at 1.5 atm pressure. Calculate the amount of dissolved gas when the pressure is raised to 6.0 atm at constant temperature.

  14. Explain the effect of temperature gaseous solute in liquid solvent.

  15. (i) Calculate the bond order of H2 and B2
    (ii) Show how the bond order is related to stability and bond length of the molecule.

  16. Describe about adsorption chromatography.

  17. Explain the ozonolysis of
    (a) Acetylene ;
    (b) Propyne

  18. What are polyhalogen compounds? Give its types with example.

  19. Do the following conversions:

  20. What do you mean by ozone hole? What are its consequences?

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