BAHAWALPUR BOARD 2017
PAPER CHEMISTRY PART-1
Time: 20 MM.(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.

• The number of moles of CO₂ which contains 8 grams of Oxygen are:
  
  (A) 0.25
  (B) 0.50
  (C) 1.0
  (D) 1.50


• The largest number of Molecules are present in:
  
  (A) 3.6 g of H_2O
  (B) 4.8 g of C₂H₅OH
  (C) 2.8 g of CO
  (D) 5.4 g of N₂0₅


• A filtration process could be very time consuming if it were not aided by agent lesuction which is developed:
  
  (A) If the paper covers the funnel up to its circumference
  (B) If the paper has got small sized pores in it.
  (C) If the paper fits tightly
  (D) If the stem of the funnel is large so that it dips into the filtrate


• The molar volume of CO₂ is maximum at:
  
  (A) STP
  (B) 127°C and 1 Atm
  (C) 0°C and 2 Atm
  (D) 273°C and 2 Atm


• The order of rate of diffusion of gases NH₃ , SO₂, C1₂ and CO₂ is
  
  (A) NN₃> SO₂> C1₂> CO₂
  (B) NH₃> CO₂> SO₂> C1₂
  (C) Cl₂> SO₂> CO₂> NH₃
  (D) NH₃> CO₂> C1₂> SO₂
  
  
• London Dispersion Forces are the only forces present among the:
  
  (A) Molecules of H₂O in Liquid State
  (B) Atoms of He in Gaseous State at high temperature
  (C) Molecule of Solid Iodine
  (D) Molecules of HC1 Gas


• Which of the given is Pseudo Solid:
  
  (A) CaF₂
  (B) Glass
  (C) NaC1
  (D) Diamond


• Orbitals having same energy are called:
  
  (A) Hybrid Orbitals
  (B) Valence Orbitals
  (C) Degenerate Orbitals
  (D) d - Orbitals


• Quantum Number Values for 2p Orbitals are:
  
  (A) n = 2, =l
  (B) n = 1 ,  = 2
  (C) n = 1 ,  = 0
  (D) n = 2 ,  =0


• Dipole Moment of H₂O is:
  
  (A) 1.6 I D
  (B) 0.95 D


• First Ionization Energy of Mg Atom is:
  
  (A) 738 KJ Mole^-1
  (B) +1450 KJ Mole^-1
  (C) - 349 KJ Mole^-1
  (D) -500 KJ Mole^-1


• The change in Heat Energy of a chemical reaction at constant temperature and pressure is called
  
  (A) Enthalpy Change
  (B) Heat of Sublimation
  (C) Bond Energy
  (D) Internal Energy Change


• For which system does the equilibrium constant (Kc) has units of (concentration)^-1?
  
  (A) N₂ + 3H₂  2NH₃
  (B) H₂ + 1₂ 2H1
  (C) 2N_O2  N₂O₄
  (D) 2HF  H₂+ F₂


• Which statement about the following equilibrium is correct:
  
  2SO₂(g) + O₂(g) =2SO₃(g) ΔH = -188.3kjmol^-1
  (A) The value of Kp falls with rise in Temperature
  (B) The value of Kp falls with increasing pressure
  (C) Adding V₂O₅ Catalyst increases the equilibrium yield of SO₃
  (D) The value of Kp is equal to Kc


• Which of the following solutions has highest boiling point elevation:
  
  (A) 5.85 % Solution of NaCI
  (B) 18 % Solution of Glucose
  (C) 6 % Solution of Urea
  (D) 34.2 % Solution of Sucrose


• The Cathodic Reaction in Electrolysis of dil H₂SO₄ with Pt electrodes is:
  
  (A) Reduction
  (B) Oxidation
  (C) Redox Reaction
  (D) Neither Oxidation nor Reduction


• The rate of Reaction:
  
  (A) Increases as the reaction proceeds
  (B) Decreases as the reaction proceeds
  (C) Remains same as the reaction proceeds
  (D) May decrease or increase as the reaction proceed

BAHAWALPUR BOARD 2017
PAPER CHEMISTRY PART-1
Time: 3:10 Hours (Subjective Part)
Marks: 83
Section-I

2. Attempt any EIGHT short questions.

1. Why Atomic Masses mentioned in literature are in fraction?
   
2. Differentiate between Quantitative Analysis and Qualitative Analysis.
   
3. Give two faulty postulates of Kinetic Molecular Theory.
   
4. How value of Kc helps to predict extent of reaction?
   
5. What is Limiting Reactant? Give one example.
   
6. Give two uses of Chromatography.
   
7. How Purification is carried out by Sublimation?
   
8. Describe Ether Extraction.
   
9. Define Critical Temperature with one example.
   
10. Give two characteristics of Plasma
    
11. Define State of Dynamic Equilibrium.
    
12. Briefly discuss Common Ion Effect.

3. Write short answers to any EIGHT (8) questions.

1. Why the Ice Floats on water?
   
2. Evaporation a causes cooling, why?
   
3. Define Polymorphism. Give one example.
   
4. What is Anisotropy? Give one example.
   
5. How X - fays are produced?
   
6. State Aufbau Principle.
   
7. What is Solubility Principle? Give example.
   
8. Zn can displace iron from its solution, how?
   
9. State Moseley's Law with its Mathematical Form.
   
10. How will you prove that Cathode Rays travel in Straight Line?
    
11. Define Mole Fraction and ppm (parts per million).
    
12. Calculate Oxidation Number of Cr in: (i) K₂CrO₄ (ii) Cr₂O₃

4. Write short answers to any SIX (6) questions.

1. Prove that Bond Order of He₂ is zero.
   
2. Why the size of CI ion is greater than that of Cl atom?
   
3. No bond in chemistry is 100 % ionic, justify,
   
4. Ionization Energy decreases down the group although Nuclear Charge increases, explain.
   
5. What is Catalytic Poisoning? Give an example.
   
6. State Rate of Chemical Reaction and give its units.
   
7. What is Pseudo First Order Reaction? Give an example.
   
8. State with example Enthalpy of Combustion,
   
9. What is Lattice Energy? Give example.

SECTION-II

Attempt any THREE questions.
5. (a) Serotonin(Molar Mass = 176 g/ mol) is a compound that conducts nerve impulses in brain and muscles. It contains 68.2 %C, 6.86% H, 15.09 % N and 9.08 % O.What is its Molecular Formula?
(b) Write a note on three factors affecting the London Forces.

6. (a) Explain. Non - Ideal behaviour of Gases.
(b) Write postulates of Bohr's Atomic Model.

7. (a) Write down Postulates of VSEPR Theory. Explain structure of NH3 on the basis on VSEPR Theory.
(b) State and explain first law of Thermodynamics. How does it explain that qy = ΔE?

8. (a) Ca(OH)₂ is Sparingly Soluble Compound. Its solubility product is 6.5 x 10^-6.  Calculate the solubility of Ca(OH)₂
(b) Calculate the solubility of Ca (OH)₂.

9. (a) Give three statements of Roults' Law.
(b) Differentiate between Homogeneous and Heterogeneous Catalysis.