Inter (Part-I) Bahawalpur Board 2015
Chemistry
Part I (Objective Type)
Time Allowed: 20 Minutes 
Max. Marks: 17

Note: You have four choices 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
Circle the correct option i.e. A/B/C/D. Each part carries one mark.

• Solvent Extraction is an equilibrium process and it controlled by:

a) Law of mass action
b) Distribution law
c) The amount of solvent used
d) The amount of solute

• Tin has isotopes:

a) 7
b) 9
c) 5
d) 11

• The number of moles of CO₂ which contains 8.0g of oxygen:

a) 0.25
b) 0.5
c) 1.0
d) 1.50

• 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

• Which of the given is a Pseudo Solid:

a) CaF2
b) glass
c) NaCI
d) All

• When water freeze at 0°C, its density decreases due to:

a) cubic structure of ice
b) Empty spaces is present in the structure of ice
c) Change of bond length
d) Change of Bond Angles

• Feeling uncomfortable breathing in un-pressurized cabins is due to :

a) High pressure of CO ₂
b) Low pressure of O₂
c) Fatigue
d) Low pressure of CO₂

• Orbitals having same energy are called:

a) hybrid orbital
b) Valence orbital
c) Degenerate orbital
d) d- orbital

• In Al₂O₃, the ratio between the ions is:

a) 1:2
b) 2:1
c) 2:3
d) 3:2

• Which of the given molecules has zero dipole moment:

a) NH₃
b) CHCI₃
c) H₂O
d) BF₃

• The c/m value for the positive rays is maximum for the gas:

a) Hydrogen
b) Helium
c) Oxygen
d) Nitrogen

• For a given process the heat changes at constant pressure(qp) and at constant value(qv) are related to each others:

a) qp=qv
b) qp<qv
c) qp>qv
d) qp=1/2qv

• Molarity of pure water is:

a) 1
b) 18
c) 55.5
d) 6

• The unit of the rate constant is the same as that of the rate reaction in:

a) First order reaction
b) Second order reaction
c) third order reaction
d) zero order reaction

• The ph of 10^-3 mole dm^-3 of an aqueous solution of H₂SO₄ is:

a) 3.0
b) 2.7
c) 2.0
d) 1.5 

• Stronger the oxidization agent, greater is the:

a) Oxidation potential
b) Reduction potential
c) Redox potential
d) E.M.F of cell

• By adding NH₄Ci to a solution of NH₄OH in water the ionization NH₄OH:

a ) Increase
b) Decrease
c) Remains same
d) Can not be predicted

Inter (Part-I) Bahawalpur Board 2015
Chemistry
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83

Section I

Note: It is compulsory to attempt 8 parts each from Q.no.2 and Q.No.3 while attempt 6 parts from Q.no.4 and attempt any 3 questions from part II. Write same q.no and its part no as given in the question paper:

Question #2

• Mg atom is twice heavier than that carbon atom, justify.
• What is meant by diffusion of gas? Give an example.
• Define Ph of a solution and give its equation.
• What are reversible reaction? Give an example.
• Define system and state function.
• State the Le-Chatelier’s principle.
• Write any two applications of plasma.
• What is a spontaneous process? give an example
• What is sublimation ? give an example.
• Define distribution law or partition law.
• Write two conditions of stoichiometery.
• Define cation and anion.

Question #3

• Why one feels the sense of cooling under the fan after bath?
• Heat of sublimation of iodine is very high, justify.
• One of the unit cell angles of hexagonal crystal in 120°?
• Differentiate between continuous and line spectrum.
• Define Electronegativity and its trend in periodic table.
• Define Pauli’s exclusion principle. give one example
• Explain the structure of NH₃ molecules on the basis of VSEPR theory.
• Explain why ionic crystal are highly brittle?
• Why cationic Radii is samller than Aionic Radii?
• Why the positive rays are also called canal rays?
• Discuss He-Molecule on the basis of MOT.
• What is (n+l) rule?

Question #4

• Define percentage weight/weight. Give an example.
• A queous solution of CuSO₄ is acidic in nature, justify it.
• Calculate the oxidation number of manganese in KMnO₄.
• A porous plate or salt bridge is not required in led storage cell. Explain.
• How does impure copper can be purified by electrolytic process?
• Define homogeneous catalysis and give an example.
• A catalyst is specification its action, Describe it.
• What is discontinuous solubility curve?
• What is Auto Catalyst? Give an example.

Part-II

Question #5
(a) Describe Manometric method for determination of vapour pressure of a liquid with diagram.
(b) Calculate the number of grams of K2SO4 and water produced when 14g of KOH are reacted with excess of H2SO4? (K=39, S=32, O=16, H=1.008 amu)

Question #6
(a) What is the ideal gas constant “R”? Calculate its value in different units.
(b) How the charge on electron was measured by Oil Drop Method?

Question #7
(a) What is Orbital Hybridization? Explain the geometry of ethylene molecule on the basis of orbital hybridization.
(b) What is Enthalpy of a reaction? How is ∆H of a reaction measured in laboratory by glass calorimeter. 

Question #8
(a) Discuss the factor which can be affect the rate of chemical reaction.
(b) Calculate the Ph of a buffer solution in which 0.11 molar CH₃COOONa and 0.09 molar acetic acid solutions are present. Ka for CH₃COOH is 1.85x10^-5

Question #9
(a) Explain Roult’s law with three definitions.
(b) What is electrochemical series? Explain its any three applications.

Part-III (Practical part)

Note:- Write down the standard solution, chemical equation with mole ratio, indicator with end point, procedure and supposed readings with calculation for A,B & C.
Write down the material required, diagram and procedure for part D and E.

Question #10
(a) How will you separate a mixture of inks by chromatography?
(b) How will you purify the Benzoic acid from Water solution?
(c) 1.5g of NaOH is dissolved in 250cm3 solution. Find out percentage purity: (Na= 23, H=1.008, O=16)
(d) 2.78g of FeSo4. XH2O is dissolved in 100cm3 of solution. Find out the value of “x”.
(e) 30g of a sample of sodium Thoiosuplate (NaS₂O₃.₅H₂O) has been dissolved per dm³ of a solution. Find out the percentage purity of the sample. (Molecular mass of NaS₂O₃.5H₂O )