Inter (Part-I) Multan Board 2014
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.

• ------------- Species has unpaired electrons in antibonding molecular orbitals.

(A) N2
(B) O2+
(C) O2-
(D) F_2-

• In sp² hybridization the orbital’s are oriented at an angle of:-

(A) 109.5^o
(B) 104.5°
(C) 180^o
(D) 120°

• In a Bomb Calorimeter the reactions are carried out at constant.

(A) Pressure
(B) Temperature
(C) Volume
(D) Enthalpy

• The value of pH and pOH of pure water at 25°C is:-

(A) 7
(B) 14
(C) 1x10^-14
(D) 1 x 10¹⁴

• Salt gives neutral solution when dissolved in water.

(A) NH₄Cl
(B) AlCl₃
(C) CuSO₄
(D) NaCl

• The Oxidation number of Mn in K₂MnO₄ is :-

(A) +3
(B) +5
(C) +6
(D) +7

• The catalyst used for the reaction HCOOH H2 + CO₂ is:-

(A) Copper
(B) Alumina
(C) Silica
(D) Iron

• The volume occupied by 1.4g of N₂ at STP is:-

(A) 2.24 dm³
(B) 22.4 dm³
(C) 1.12 dm³
(D) 112cm³

• A Hemoglobin Molecule is -------- times heavier than Hydrogen Atom.

(A) 17,000
(B) 34,000
(C) 68,000
(D) 88,000

• The iodine present in water can be separated by _ technique.

(A) Sublimation
(B) Solvent extraction
(C) Chromatography
(D) Filtration

•  l , in CCl₄ solvent shows color:-

(A) Blue
(B) Brown
(C) Purple
(D) Pink

• Absolute zero is equal to:-

(A) 273°C
(B) – 273^oC
(C) 0°C
(D) 273 K

• 44g of CO₂ occupies 22.414 dm³ at:-

(A) 0^oC and 1 atm
(B) 0K and I atm
(C) 273^oC and l atm
(D) 273K and 2atm

• The molecules of CO₂ in dry ice form the:-

(A) Ionic Crystals
(B) Covalent Crystals
(C) Molecular Crystals
(D) Metallic Crystals

• Acetone and Chloroform are soluble in each other due to:-

(A) Ion-dipole interaction
(B) London's forces
(C) Dipole-Dipole interaction
(D) Intermolecular Hydrogen Bonding

• When 6d orbital is complete, the entering electron goes into:-

(A) 4p orbital
(B) 7s orbital
(C) 7p orbital
(D) 7d orbital

• The e/m value for the positive rays is maximum for gas.

(A) Hydrogen
(B) Helium
(C) Oxygen
(D) Nitrogen

Inter (Part-I) Multan Board 2014
Chemistry
Part I (Subjective)
Time Allowed: 2.10 Hours 
Max. Marks: 83

Section I

2. Attempt any eight parts 8 x 2=16

• How Empirical formula is calculated?
• Find out the number of Oxygen atoms in 0.4 moles of Ozone (0 = 16 amu)
• No individual neon atom in the sample of the element has a mass of 20.18 amu . Give reason.
• Describe a safe and reliable method for drying a crystalline substance.
• How filter paper is folded?
• What is Joule Thomson Effect?
• Why real gases deviate from ideal behavior?
• Why SO₂ is comparatively non-ideal at 273K but behaves ideally at 327°C?
• Why ice has lower density than liquid water?
• Why Earthenware vessels keep water cool?
• Why ionic crystals do not conduct electricity in the solid state?
• Why ionic crystals are highly brittle?

2. Attempt any eight parts. 8x2=16

• What is the reason for production of positive rays?
• What is the value of mass of electron and charge on electron?
• What is Atomic Emission Spectrum?
• Define Principal Quantum Number and give its values.
• Define Atomic Radii with examples.
• What is Ionization Energy? Give one example.
• Define Ionic Bond with example.
• What is sp) hybridization? Give the shape of CH, molecule.
• What is system and surrounding in Thermo chemistry?
• Define Enthalpy of neutralization along with on.e example.
• Give the units of equilibrium constant K_c
• How the direction of reaction can be predicted from K_c?

4. Attempt any six parts. 6 x 2=12

• Define K_c and K_p.
• What is function of an outer larger tube in Bcckamann's Freezing Point Apparatus?
• Why charge density of Cation is greater and charges density of Anion is smaller?
• Justify that Molality is independent of temperature and Molarity changes with change of temperature.
• In is anode when connected with Copper and is Cathode when connected with At (Aluminum) give reason.
• Calculate Oxidation state of Cr in CrO_3.
• Cu⁺² ion can oxidize ZnZn⁺² ion in Galvanic cell. Justify it.
• In many cases shining surface of solid catalyst becomes dull, why?
• Describe specificity of enzymes in their action

SECTION II

NOTE: - Attempt any three questions of the following:-

Question #5
(a) What is Limiting Reactant? How it can be determined? Explain it with a chemical  reaction. 4
(b) What are Liquid Crystals? Write their uses in daily life (any three).  4

Question #6
(a) State the assumptions of VSEPR theory. Explain the shapes of NH₃ and BF₃ by this theory. 4
(b) What is Lattice Energy? How does Born-Haber cycle help to calculate the Lattice Energy of NaCl 4

Question #
.(a) 250cm³ of the sample of Hydrogen effuses four times as rapidly as 250cmt of an unknown gas. Calculate the molar mass of unknown gas. 4
(b) Explain Millikan's oil drop method to measure the charge on Electron. 4

Question #8
(a) Describe the construction and function of Standard Hydrogen Electrode. 4
(b) Ca (OH )₂ is sparingly soluble compound. Its solubility product is 6.5 x 10^-6. Calculate the solubility of Ca (OH)₂ 4

Question #9
(a) Explain the Fractional distillation of ideal mixture of two liquids. 4
(b) Define the Order of a Reaction. How does half life method can be used for its determination? 4

SECTION-III (PRACTICAL PART)

Question #10

NOTE:- Attempt any three parts. Write down standard solution; chemical equation with mole ratio, Indicator with end point, procedure and supposed reading with calculation for part A, B & C. ( 1+1 + 1+1+1 )= 5 , Write down material required, diagram and procedure for part D & E. ( 1+1+3)= 5

(A)12g impure Na₂CO₃ has been dissolved per dm3 of solution calculate percentage purity of the sample (Molecular Mass of Na₂CO₃ =106 )

(B) 6.5 grams of impure KMnO₄ has been dissolved per dm₃of solution. Find out percentage purity of Mn in the sample (Atomic Mass of Mn = 55)

(C) 30g of impure Na₂S₂O₃ .5H₂O has been dissolved per dm³ of solution (Molecular mass of , Na₂S₂O₃ .5H₂O = 248). Find out percentage purity of sample.

(D) Separate the mixture of inks by paper chromatography.

(E) Prepare pure crystal of Benzoic Acid.