SAHIWAL BOARD 2014
PAPER CHEMISTRY
PART-II
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; 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

• Ecosystem is a smaller unit of:
  
  (a) Lithosphere
  (b) Hydrosphere
  (c) Atmosphere
  (d) Biosphere
  
  
• Which is not a calcarious material?
  
  (a) Lime
  (b) Clay
  (c) Marble
  (d) Marine shell
  
  
• Which one of the following elements is not present in all proteins?
  
  (a) Carbon
  (b) Hydrogen
  (c) Nitrogen
  (d) Sulphur
  
  
• Which one has the higher boiling point?
  
  (a) HCOOH
  (b) CH₃COOH
  (c) C₂H₅C0011
  (d) CH₃.C11₂,CH₂,COOH
  
  
• According to Lewis concept ethers behave as:
  
  (a) Acid
  (b) Base
  (c) Acid as well as base
  (d) None of these
  
  
• Rectified spirit contains alcohol about.
  
  (a) 80%
  (b) 85%
  (c) 90%
  (d) 95%
  
  
• Which one is the most reactive alkyl halide?
  
  
• (a) RI
  (b) RBr
  (c) RCI
  (d) RF
  
  
• Which of following acid is used as a catalyst in Friedel-Crafts reactions?
  
  (a) HNO₃
  (b) Bacl₂
  (c) BeCI₂
  (d) Alcl₃
  
  
• Synthetic rubber is made by polymerization of:
  
  (a) Chloroprene
  (b) Acetylene
  (c) Chloroform
  (d) Divinylacetylenc
  
  
• A double bond consists of:
  
  (a) Two sigma bonds
  (b) One Sigma and one Pi bond
  (c) One sigma and two Pi bonds
  (d) Two Pi bonds
  
  
• Which one shows paramagnetic behavior?
  
  (a) Fe³⁺
  (b) Zn²⁺
  (c) Cd²⁺
  (d) Sc³⁺
  
  
• Which is the strongest acid?
  
  (a) HI
  (b) HCI
  (c) HBr
  (d) HF
  
  
• Which catalyst is used in contact process?
  
  (a) Fe₂0₂
  (b) V₂O₅,
  (c) SiO2
  (d) Ag₂O
  
  
• A gas which burns with blue flame is:
  
  (a) CO₂
  (b) NO
  (c) N₂
  (d) CO
  
  
• The chemical formula
  
  (a) KNO₂
  (b) NaNO₃
  (c)  Na₂B₄O₇
  (d) Na₂CO₃,H₂O
  
  
• Elements of group-I A are called.
  
  (a) Alkali metals
  (b) Halogens
  (c) Alkaline-earth metals
  (d) Inert gases
  
  
• Which one is the basic oxide?
  
  (a) BeO
  (b) Na₂O
  (c) SO₂
  (d) NO₂

Time: 3:10 Hours
(Subjective Part)
Marks: 83
Section 1

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

• Define Mendeleev's periodic law.
• Why Na₂0 is basic while P₂O₅ is acidic in character?
• What happens when CaC₃ is hydrolyzed?
• What is the action of an aqueous solution of borax on litmus?
• What are silicates? Give one example.
• What happens when borax is treated with HCI and H₂SO₄ separately?
• How does nitrogen differ from other elements of its group? Give four points.
• Why Dinitrogen oxide is called "langhing gas"?
• What happens when NO, is dissolved in water?
• What is Bleaching powder?
• What is Teflon? Give its uses.
• What is meant by available chlorine?

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

• What is the importance of proteins?
• Define monosaccharide and give an example.
• How polystyrene is prepared?
• Give four uses of fomaldehyde.
• What is Fehling's solution test? Give equation.
• How landform is prepared from acetaldehyde?
• Write the structural formulae for Neopentane and Isobutylene.
• Give four uses of Ethane
• Draw the structure of C₂H²and indicate the bond angles.
• What is functional group isomerism? Give an example.
• How chromate ions are converted into dichromate ions?
• What is coordination number? Give an example.

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

• Define resonance energy. What is the resonance energy of benzene?
• Define electrophile and nucleophile.
• What is meant by denaturing of alcohol?
• Write two methods for the preparation of ethers.
• How urea is manufactured?
• What are the advantages of using potassium fertilizers?
• What are clinkers? How they are converted to cement?
• What are the conditions required for the formation of smog?
• How ozone layer in stratosphere is effected by chlorofluorocarbons?

 SECTION-II

Attempt any THREE questions. (8x3=24)

Question#5
(a) Define ionization energy. Discuss its trend in periods and groups. 4
(b) Write four points of differences between Beryllium and other members of its group. 4

Question#6
(a) Define hybridization. Explain SP hybridization. 4
(b) What are S_N reactions? Explain S_N  reaction with the help of suitable example. 4

Question#7
(a) State Markownikov's rule. Give reaction of HBr with 4
(i) Propene
(ii) 2-Butene
(iii) 1-Butene
(b) Write down the mechanism of the reaction between acetic acid and ethanol. 4

Question#8
(a) What is sulphonation? Give its mechanism. 4
(b) Give industrial preparation of ethyl alcohol. 4

Question#9
(a) Explain Open Hearth process for manufacture of steel.4
(b) Describe the process of incineration of industrial waste.4

SECTION-III

Attempt any THREE questions. (5*3=15)

Question#10
(i) (a) Write down any two confirmatory tests for S0₃. 2
(b) Describe palm test.
(ii) (a) Write down any two confirmatory tests of C(1' . 3
(b) Write group reagent for 3' group basic radicals. 2
(iii) (a) Write down two confirmatory tests for 11,12' . 3
(b) Write down the reagent used to detect group IV and V basic radicals. 2
(iv) Write down material, equation and procedure of glucosazone preparation. 5
(v) Prepare Lasagna’s solution and detect Nitrogen and Halogen present in it. 5