FAISALABAD BOARD 2014
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; rill 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.

• Which is pseudo solid?

(a) CaF₂
(b) Glass
(c) NaCl
(d) CaC1₂

• Ionic solids are characterized by:

(a) Low melting point
(b) Good conductiiityin solid state
(c) High vapour pressure
(d) Solubility in polar solvent

• Equal masses of methh4beand oxygen are mixed in an empty container at 25°C. The fraction of total pressure exerted by oxygen is:

(a) 2/3
(b) 1/3
(c) 8/9
(d) 1/9

• Which is not used as drying agent in a desiccators? -

(a) CaC1₂
(b) NaCl
(c) P₂P₃
(d) Silica gel

• The comparative rates at which the solutes move in paper chromatography depend on:

(a) The size of paper
(b) Values of solutes
(c) Temperature of the experiment
(d) Size of the chromato graphic tank

• Pressure remaining constant at which temperature the volume of a gas will become twice of what it is at 0°C?

(a) 546°C
(b) 200K
(c) 546K
(d) 273K

• The largest number of molecules are present in:

(a) 3.6 of H₂O
(b) 4.8g of C₂H₅OH
(c) 2.8g of CO
(d) 5.4g of N₂O₅

• The number of moles of CO₂ which contain 8.0g of oxygen.

(a) 0.15
(b) 0.25
(c) 0.35
(d) 0.45

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

(a) Temperature of reaction
(b) Concentration of reactants
(c) Concentration of products
(d) Temperature of atmosphere

• If a strip of Cu metal is placed in a solution of FeSO₄:

(a) Cu will be deposited
(b) Fe is precipitated out
(c) Cu and Fe both dissolve
(d) No reaction takes place

• Molarity of pure water is

(a) 1.5
(b) 18.5
(c) 55.5
(d) 6.5

• The pH of 10^-3 mol dm^-3 of an aqueous solution of H₂SO₄ is:

(a) 1.5
(b) 18.5
(c) 55.5
(d) 6.5

• If an endothermic reaction is .allowed to take place very rapidly in the air, the temperature of the surrounding air:

(a) Remains constant
(b) Increases|
(c) Decreases
(d) Remains unchanged

• Which of the hydrogen halide has the percentage of ionic character?

(a) HCl
(b) HBr
(c) HF
(d) HI

• The Number of bonds in nitrogen molecule is:

(a) One sigma and one pi
(b) One sigma and two pi
(c) Three sigma only
(d) Two sigma and one pi

• When atoms are subjected `to strong electric field, splitting of spectral lines is called:

(a) Zeeman effect
(b) Stark effect
(c) Photoelectric effect
(d) Compton effect

• The wave number of the light emitted by a certain source is 2.x I 0⁶ m^-1. The wavelength of this light will be:

(a) 500 nm
(b) 500 m
(c) 200 nm
(d) 5x 10 m

FAISALABAD BOARD 2014
CHEMISTRY
PART-I
Time: 3:10 Min.
(Subjective Part)
Marks:83

Section II

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

• 180g of glucose and 342g of sucrose have the same number of molecules but different number of atoms present in them. Justify it,
• What is limiting reactant? How does it control the quantity of the product formed?
• What is molecular formula? How it is related with empirical formula?
• What is crystallization? Write the names of its various steps,
• Name the drying agents used in a desiccators. (any two)
• Prove that d =PM/RT
• What is plasma? Write its types.
• Justify that SO₂ is comparatively non ideal at 273K but behaves ideally at 327⁰C
• Justify that diamond is hard and an electrical insulator.
• Define (a) anisotropy (b) Polymorphism
• Justify that evaporation takes place at all temperatures.
• What are liquid crystals? Write its one use.

3. Attempt any EIGHT short questions, (8x2 = 16)

• Write two importance of Moseley’s law.
• Write electronic configuration of following elements:₁₂Mg (b)₂₉Cu
• What is Zeeman effect?
• What particles are formed by the decay of free neutrons?
• Define ionization energy and electron affinity.
• Why sigma bond is stronger than pi bond?
• Why the dipole moment of CH₄ is zero'?
• What is basic assumption of valence shell electron pair repulsion (VSEPR) theory?
• Define standard enthalpy of combustion. Give one example,
• Differentiate between spontaneo4s and non-spontaneous reactions.
• Stale law of mass action.
• What are optimum conditions for the synthesis of NH₃?

4. Attempt any SIX short questions. (6 x2= 12)

• What are basic buffers?
• Polar solids are not dissolved in non polar solvent. Give reason.
• Define Roult's law,
• Make difference between continuous and discontinuous solubility curves.
• Write the importance of standard hydrogen electrode.
• Feasibility of chemical reaction can be predicted by electrochemical series. Justify.
• Calculte oxidation numb &r of nitrogen in FINO₃.
• What is enzyme cataysis?
• Differentiate between fast step and rate determining step with example.

SECTION-III

Attempt any THREE questions.. (8 x 3 =24)

5. (a) What are ionic solids? Give its properties. 2+2
(b)What is difference between actual & theoretical yield? Why actual yield is less than theoretical yield? 0+4

6. (a) What is orbital hybridization? Discuss Sp³ hybridization with an Example. (4)
(b)Explain the term internal energy of a system and also mention how the change in internal energy of a system can occur? (4)

7.(a) A sample of nitrogen gas is enclosed in 'vessel of volume 380cm³ at 120°C arid pressure of 101325Nm^-2. This gas is 'transferred to a 0dm³ flask and cooled to 27°C. Calculate the pressure in Nm exerted by the gas at 27°C. (4)
(b)Give four defects is of Bohr's atomic model. (4)

8. (a) Ca(OH)₂ is a sparingly soluble, compound. its solubility product is 6.5x10^-6. Calculate the solubility of Ca(OH)₂ (4)
(b)Write comprehensive note on Ad accurnilator with its discharging. (4)

9. (a) How lowering o vapour pressure as colligative property is used to fin out motecumolecular mass of solute. (4)
(b)Explain effect of temperature on rate of reaction by Arrhenius equation. (4)

SECTION- IV:Attempt any THREE questions. (5x 3 = 15) .

(i)Write down standard solution, chemical equation with mole ratio indicator with end point, procedure and supposed readings with calculations for part A,B & C.(5)
(ii)Write down material required, diagram and procedure for parts D and E. (5)
10.(a) Determine the amount of CH₃COOH in 100cm³' vinegar. (Molecular mass of CH₃COOFI= 60) (5)
(b) Standardize the give solution of 134n04 and calculate the volume of this solution required to prepare 500cm' of 0.001M solution. (Molecular mass of KMr10, =158). (5)
(c) Determine the percentage purity of 12 solution, which is 20g dissolved per dm' of solution. (Molecular mass of 12 = 254). (5)
(d) Separate the mixture of inks by paper chromatography. Also calculate Rf value. (5)
(e) Purify commercial Nail obtained from Khewara Mine by passing HCl gas through common ion effect. (5)