SARGODHA BOARD 2016
PAPER CHEMISTRY PART-I
Time: 20 Min. 
(Objective Part)
Marks: 17
Note: You have four choice for each objective type question as A, B, C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

Question#1

• One mole of SO2 contains:
  
  (a) 02 x 10²³ atoms of oxygen
  (b) 1x 10²³ molecules of SO²
  (c) 02 x 10²³ atoms of sulphur
  (d) 4 gm of atoms of SO₂
  
  
• The volume occupied by 1.4 gm of N₂ at S.T.P is:
  
  (a) 2.24dm³
  (b) 22.4dm³
  (c) 1.12dm³
  (d) 112cm³
  
  
• Solvent Extraction method is a particularly useful Technique for separation when the product to be separated is:
  
  (a) Non-volatile or Thermally
  (b) Volatile or Thermally stable
  (c) Non-volatile or Thermally stable
  (d) Volatile or thermally unstable
  
  
• Number of molecules is one dm₃ of water is closed to:
  
  (a) (6.02/22.4)*10³
  (b) (12.04/22.4)*10³
  (c) (18/22.4)*10³  
  (d) 55.6* 6.05*10²³
  
  
• The deviation of a gas from Ideal behaviour is maximum at:
  
  (a) -10°C and 5.0 atm
  (b) -10°C and 2.0 atm
  (c) 100°C and 2.0 atm
  (d) 0°C and 2.0 atm
  
  
• Ionic solids are characterized by:
  
  (a) Low melting points
  (b) Good conductivity in solid state
  (c) High vapour pressures
  (d) Solubility in polar solvents
  
  
• Amorphous solids:
  
  (a) Have sharp melting points
  (b) Undergo clean cleavage when cut with knife
  (c) Have perfect arrangement of atoms
  (d) Can possesses small regions of orderly arrangement of atoms
  
  
• Splitting of spectral lines when atoms are subjected to strong Electric field is called:
  
  (a) Zeeman Effect
  (b) Stark Effect
  (c) Photo Electric effect
  (d) Compton's effect
  
  
• Quantum number values for 2p orbitals are:
  
  (a) n = 2, =1 
  (b) n =1, =2
  (c) n = 1,  = 0
  (d) n = 2,  = 0
  
  
• An Ionic compound A+ .8- is most likely to be formed when:
  
  (a) The ionization energy of A is high and electron affinity of B is low
  (b) The ionization energy of A is low and electron affinity of B is high
  (c) Both ionization energy of A and electron affinity of B are high
  (d) Both ionization energy of A and electron affinity of B are low
  
  
• Which of the following molecules has zero dipole moment?
  
  (a) NH₃
  (b) CHC₃
  (c) H₂O
  (d) BF₃
  
  
• For the reaction NaOH + NaCl →NaCl+ H₂O . The change in Enthalpy is called.
  
  (a) Heat of reaction  
  (b) Heat of formation
  (c) Heat of Neutralization
  (d) Heat of combustion
  
  
• Stronger the oxidizing agent, greater is the:
  
  (a) Oxidation potential
  (b) Reduction potential
  (c) Redox potential    
  (d) E.M.F of cell
  
  
• The solubility product of AgC is 2.0x10^-10mo²dm^-6 The maximum concentration of Ag+ ions in solution is:
  
  (a) 2.0 10^-10 mol dm^-3          
  (b) 1.41 10^-5 moldm^-3
  (c) 1.0 x 10^-10 mol dm^-3
  (d) 4.0 x 10^-30 mol dm^-3
  
  
• An azeotropic mixture of two liquids boils at a lower temperature than either of them when:
  
  (a) It is saturated
  (b) It shows positive deviation from Raoult's law
  (c) It shows negative deviation from Raoult's law
  (d) It is metastable
  
  
• The molar volume of CO, is maximum at:
  
  (a) S.T.P
  (d) 273°C and 2 atm
  (c) 0°C and 2 atm
  (b) 127°C and 1 atm
  
  
• With increase of 10°C temperature the rate of reaction doubles. This increase in rate of reaction is due to:
  
  (a) Decrease in activation energy of reaction
  (b) Decrease in the number of collisions between reactant molecules
  (c) Increase in activation energy of reactants
  (d) Increase in number of effective collisions

Time: 2:40(Hours).
(Subjective Part)
Marks:68
Section-I

2. Attempt any EIGHT short questions. (8 x 2 = 16)

• Define stoichiometry. Give two stoichiometric assumptions.
• Define mass spectrometer.
• How many molecules of water are there in 10 g of ice.
• How crystals are dried using filter paper. Give its two disadvantages.
• Define solvent Extraction and Partition Law.
• Water vapours do not behave ideally at 273 K. Why.
• Derive Boyle's Law from Kinetic gas equation.
• State Graham's Law of Diffusion, give its mathematical expression.
• Calculate the pH of 10^-4 modm^-3 of Ba(OH)₂ .
• Define Le-Chatelier's Principle.
• One molal solution of urea in water is dilute as compared to its one molar solution.
• What are colligative properties name any two colligative properties.

3. Attempt any EIGHT short questions. (8 x 2 = 16)

• Give two uses of liquid crystal.
• Justify Evaporation is a cooling process.
• Define polymorphism with example.
• Give four properties of covalent crystal.
• Justify that the distance gaps between orbits go on increasing from the lower to the higher orbit.
• Define Aufbau's Principle and Hund' rule.
• Why it is necessary to decrease the pressure in the discharge tube to get the cathode rays.
• Give two postulates of plank's quantum theory.
• Define azeotropic mixture. Give two examples.
• Explain why the standard oxidation potential of 'Zn' is 0.76 V and its reduction potential is -0.76 V.
• Define standard Electrode Potential.
• What are Primary and Secondary cells. Give examples of each.

4. Attempt any SIX short questions. (6 x 2 = 12)

• Why the lone pairs of electrons on an atom occupy greater space than Bond Pair of Electrons.
• Why Molecular orbital theory is superior than Valence Bond Theory?
• Why the Atomic Radii increases down the group?
• How the % age Ionic character of the Polar Bond can be determined?
• Define non-spontaneous process with an example.
• Define Enthalpy of combustion with one example.
• Define Instantaneous rate of reaction.
• Define homogenous catalysis with two examples.
• Rate of a chemical reaction is ever changing parameters under the given conditions justify it.

SECTION-II

Attempt any 3 question (8 x 3=24)
Question#5
(a) A sample of liquid consisting of carbon„ hydrogen and oxygen was subjected to combustion analysis, 0.5439 g of the compound gave 1.039 g of CO₂, 0.6369 g of H₂O. Determine the empirical formula of the compound.
(b) Define vapour pressure. How vapour pressure is measured by Manometric method?

Question#6
(a) Explain Boyle' s law and Avogadro's law from kinetic molecular theory of gases.
(b) Write four properties of Positive rays.

Question#7
(a) Write a note on Ionic Bond? By giving an example of KC1 in detail?
(b) Describe the measurement of enthalpy of a reaction by glass calorimeter?

Question#8
(a) Ca(OH)₂ is a sparingly soluble compound. Its solubility product is 6.510^-6 . Calculate the solubility of Ca(011),.
(b) Give four characteristics of enzyme catalysis.

Question#9
(a) Describe the measurement of Boiling Point Elevation by Landsberger's Method.
(b) Briefly explain the any four industrial importance of electrolysis processes.