Inter (Part-I) Faisalabad 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.

• The largest number of molecules are present in:

(A) 3.6g of H₂O
(B) 4.8g of C₂H₅OH
(C) 2.8 g of CO
(D) 5.4g of N₂O₅

• Ascrobic acid is vitamin:

(A) A
(B) B
(C) C
(D) D

• Solvent extraction method is particularly useful technique for separation when the product to be separated is:

(A) Non-volatile or thermally unstable
(B) volatile or thermally stable
(C) Non-volatile or thermally stable
(D) volatile or thermally unstable

• If absolute temperature of a gas is doubled and the pressure is reduced to one half, the the volume of the gas:

(A) Remain unchanged
(B) Be doubled
(C) Reduce to 1/4
(D) Increase four times

• The partial pressure of oxygen in lungs is:

(A) 760 torr
(B) 320 torr
(C) 159 torr
(D) 116 torr

• Acetone and chloroform are soluble in each other due to:

(A) International hydrogen bonding
(B) Ion-dipole interaction
(C) Instantaneous dipole
(D) All of these

• Diamond is bad conductor because:

(A) It has tight structure
(B) It has high density
(C) It is transparent to light
(D) There are no free electrons present in the crystal of diamond to conduct electricity

• Quantum number values for 2P orbitals are:

(A) n=2l=1
(B) n=1l=2
(C) n=1l=0
(D) n=2l=0

• Lyman series occur in:

(A) Visible region
(B) U.V region
(C) I.R region
(D) None of these

• Which molecule has the highest percentage of ionic character?

(A) HCL
(B) HBr
(C) HI
(D) HF

• Carbon atom in CH₄ is hybridized:

(A) sp³
(B) sp³
(C) sp
(D) dsp²

• Calorie is equivalent is:

(A) 0.4184J
(B) 41.84J
(C) 4.184J
(D) 418.4J

• pH is of pure water is:

(A) 7
(B) 14
(C) 1
(D) 0

• 18g glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to:

(A) 1/5
(B) 5.1
(C) 1/51
(D) 6

• An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration.:

(A) Ag⁺ & NO₃^-1 only
(B) Ag⁺ & Ba⁺² & NO₃^-1 only
(C) Ba⁺ & NO₃^-1 only
(D) Ba⁺² & NO₃^-1 & Cl^-1 only

• In zero order reaction, the rate is independent of:

(A) Temperature of reaction
(B) Concentration of reactants
(C) Concentration of products
(D) None of these

• The number of carbon atoms in 22.0 g of CO₂ is:

(A) 3.01 x 10²³
(B) 6.02 x 10²³
(C) 3.01 x 10²²
(D) 60.2 x 10²²

Inter (Part-I) Faisalabad Board 2015
Chemistry
Part I (Subjective)
Time Allowed: 3.10 Hours 
Max. Marks: 83

Section II

2. Attempt any EIGHT short questions: 16

• Differentiate between actual yield and theoretical yield.
• N₂ and CO have same number of electrons, protons and nutrons. Justify
• Define mole and molar volume.
• Why is there a need to crystallize the crude product?
• Write any two features of a good solvent.
• What is absolute zero?
• Water vapours do not behave ideally at 273K.
• Define enthalpy of solution and give an example.
• What are exothermic reactions and endothermic reactions?
• What is meant by a common ion effect?
• Define pOH of a solution. Give its equation.
• Why do we need buffer solutions?

3. Attempt any EIGHT short questions: 16

• How earthen ware vessel keep water cool? Explain.
• Why boiling point of water is different at Murree hills and at Mount Everest?
• Explain why sodium chloride and caesium chloride have different structures?
• Why electrical conductivity of the metals decreases by increasing temperature?
• Write two defects of Rutherford’s model of atom?
• What is Moseley’s law? Give its mathematical expression.
• Mention two defects of Bohr’s atomic model.
• Whats is Hund’s Rule. Give one example?
• Why MOT is superior to VBT?
• What factrors influence the ionization energy.
• Differentiate between sigma bond and pi-bond?
• Bond distance is the compromise distance between two atoms.Explain

4. Attempt any SIX short question. (12)

• What is molarity? Give an example
• Aqueous solution of CH₃COONa is basic in nature. Justify it.
• Na and K can displace hydrogen from acids but Cu cannot. Justify it.
• Define heterogeneous catalysis and give an example.
• Why lead accumulator is called a chargeable example?
• Non-ideal solution do not obey the Raoult’s Law.Give reason.
• Calculate oxidation number of sulphur in SO₄^2-.
• A finely divided catalyst may prove more effective. Describe it briefly.
• What is halflife period? Give an example.

SECTIONS-III

Note: Attempt any THREE questions.

Question #5
(a) Differentiate between isomorphism and polymorphism with suitable example.
(b) Mg metal reacts with HCl to give hydrogen gas. What is minimum volume of HCl solution. (27% by weight) required to produce 12.1g of H₂? The density of HClsolution is 1.14g cm^-3
Mg_(s) =2HCl_(eq) → MgCl_2(eq) + H_2(g)
(Mg = 24, Cl-35.5 & H = 1.008a mu)

Question #6
(a) Gases show non-ideal behaviour at low temperature and high presser. Explain with help of graph.
(b) Write down the main postulates of Bohr’s theory.

Question #7
(a) Draw the molecular orbital diagram of N₂ molecular, Give the electronic configuration of N₂ and calculate bond order.
(b) Differentiate between: (i) exothermic and endothermic reactions (ii) spontaneous and non-spontaneous reactions.

Question #8
(a) Differentiate between homogeneous catalysis and heterogeneous catalysis at least with one example for each .
(b) The solubility of PbF₂ at 25^oC is 0.64 gdm^-3.Calculate K_sp and PbF₂.

Question #9
(a) The solubility ? Explain solubility curves.
(b) What is lead accumulator battery? Discuss its discharging process. 

SECTIONS-IV (Practical Part)

Note: Attempt any THREE questions.

Write down standard solution, chemical equation with mole ratio indicator with end point, procedure and supposed readings with calculations for Part A, B, C. Write down material required, diagram and procedure for parts D and E.

Question #10.
(a) Separate the Pb⁺² and Cd⁺² ions by paper chromatography.
(b) How will you prepare pure crystal of benzoic acid?
(c) The given solution contains 20g of mixture of NaOH and Na₂SO₄ per dm³. Calculate percentage purity of sample.
(d) 27.8g of FeSO₄..XH₂O has been dissolved per dm³ of solution. Calculate value “ X” (Molar mass of FeSO₄.XH₂O (152+18X) )
(e) 25g of impure Na₂S₂ O₃ . 5H₂O has been dissolved per dm³ of solution. Find out percentage purity.