Chemistry Subjective Group 2 Inter Part 1 Past Paper 2014 Lahore Board

Chemistry Subjective Group 2 Inter Part 1 Past Paper 2014 Lahore Board

Inter Part 1 Lahore Board 2014

Chemistry Paper I Essay Type

Time: 3.10 Hours        Marks: 83

Group II

(SECTION I)

Write short answers to any EIGHT (8) questions   

  • Define molecular ion, write its uses.
  • Why we calculate %age yield?
  • Define sublimond and sublimate.
  • Write main uses of chromatography.
  • Prove that P1= Pt X1
  • Calculate fraction of total pressure exerted by oxygen when equal masses of CH4 and 02 are mixed in an empty container at 25°C.
  • Justify that volume of gas becomes theoretically zero at —273 °C.
  • Evaporation causes cooling. Why?
  • Ionic crystals are highly brittle. Why?
  • Cleavage is an anisotropic behavior, explain it.
  • Why boiling point of H20 is greater than HF?

 

Write short answers to any EIGHT (8) questions   

  • Calculate the mass of electron when its Om value is 1.7588 . 1011 C Kg-1.
  • Write two importance’s of Moseley law.
  • Define Pauli’s Exclusion Principle with an example.
  • Write a nuclear reaction for the decay of free neutron.
  • д-bonds are more diffused than o-bonds. Give reason.
  • What is bond order? Give an example.
  • Define electro negativity. Give its trend in the periodic table.
  • Define coordinate covalent bond and give one example.
  • What is thermochemical equation? Give two examples.
  • Define heat of neutralization with an example.
  • What is common in effect? Give an example.
  • What are Pka, and Pkb?

 

Write short answers to any SIX (6) questions

  • What is Henderson’s equation?
  • Define Zeotropic mixtures. Give one example.
  • Boiling points of the solvents increase due to the presence of solutes. Justify it.
  • Define molarity and molality.
  • What is the purpose of salt bridge?
  • Calculate the oxidation number of ‘Mn’ in KMnO4.
  • What is difference between electrolytic and voltaic cell?
  • Define order of reaction with the help of an example.

 

(SECTION II)

Note Attempt any THREE questions.

Question

(a) What are molecular solids? Give examples and explain their properties.

(b) What is stoichiometry? Give its assumptions. Mention two important laws, which help to perform the stoichiometric calculations.

Question

(a) Explain structure of CH4, on the basis of hybridization theory.

(b) Prove that ∆E = qy

Question

(a) Calculate the mass of 1 dm3 of NH3 gas at 30°C and 1000 mm Hg pressure, considering that NH3 is behaving ideally.

(b) Give the defects of Bohr’s atomic model.

Question

(a) What is standard hydrogen electrode (SHE)? How it is used to measure the electrode potential of zinc?

(b) Calculate the pH of a buffer solution in which 0.11 molar CH3COONa and 0.09 molar acetic acid solutions are present Ka for CH3COOH is 1.85 x 10 -5

Question

(a) Describe the freezing point depression method for the determination of molecular mass of an organic compound.

(b) How rate of reaction depends upon the following factors (i) Nature of reactants (ii) Surface area.

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