SARGODHA BOARD 2016
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

• Which one of the following elements forms weakly acidic oxide.
  
  (a) Aluminium
  (b) Phosphorous
  (c) Sulphur
  (d) Chlorine
  
  
• The element which forms Amphoteric oxide is:
  
  (a) Beryllium
  (b) Sodium
  (c) Magnesium
  (d) Calcium

• The stable yellow modification of Lead chromate is:
  
  (a) Triclinic
  (b) Hexagonal
  (c) Tetragonal
  (d) Monoclinic

• Which one acts as catalyst in contact process:
  
  (a) Fe₂0₃
  (b) V₂O₅
  (c) SO₃
  (d) Ag₂O

• In nuclear reactors, the cooling medium is provided by:
  
  (a) Helium
  (b) Neon
  (c) Xenon
  (d) Radon

• Which one of the following is a typical transition metal.
  
  (a) Sc
  (b) Y
  (c) Ra
  (d) Co

• Which class of organic compounds shows metamerism.
  
  (a) Aldehydes
  (b) Ethers
  (c) Alkenes
  (d) Alkanes
  
  
• Each carbon atom is is, -hybridized in the class of:
  
  (a) Alkenes
  (b) Alkynes
  (c) Ketones
  (d) Alkanes

• A compound that can be readily suiphonated is:
  
  (a) Toluene
  (b) Benzene
  (c) Nitrobenzene
  (d) Chlorobenzene

• Elimination bimolecular reactions involve the kinetics of:
  
  (a) First order
  (b) 2nd order
  (c) Third order
  (d) Zero order

• Ethanol can be converted into ethanoic acid by:
  
  (a) Hydrogenation
  (b) Hydration
  (c) Oxidation
  (d) Fermentation

• Silvering of mirrors involves the use of:
  
  (a) Fehling's Reagent
  (b) Benedict's Reagent
  (c) Tollen's Reagent
  (d) Baeyer's Reagent
  
  
• The solution of which acid is involved in the seasoning of food:
  
  (a) Acetic acid
  (b) Benzoic acid
  (c) Formic acid
  (d) Butanoic acid
  
  
• The enzyme used locally to stop the blood from the wound is:
  
  (a) Insulin
  (b) L-asparginase
  (c) Thrombin
  (d) Zymase

• Which one of the following elements is a trace element:
  
  (a) Copper
  (b) Nitrogen
  (c) Sulphur
  (d) Calcium

• The pH of acid rain is:
  
  (a) 6.5-7
  (b) 6-6.5
  (c) 5.6-6
  (d) Less than 5

• The substance which is classified as the secondary pollutant is:
  
  (a) Ammonia
  (b) Ozone
  (c) Sulphur trioxide
  (d) Nitric oxide

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

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

• Melting points of Group VIIA Elements increase down the group.Why?
• The oxidation states vary in a period but remain almost constant in a group. Give reason.
• BeO is amphoteric oxide. Show with two suitable reactions.
• What happens when
  (a) Lithium Nitrate is heated up.
  (b) Sodium Nitrate is heated up.
• What is Effect of heat on orthoboric acid?
• How does Aluminium react with (a) NaOH (b) H₂SO₄
• Which metals evole H₂ gas upon reaction with Nitric acid? Illustrate with two chemical Equations.
• P₂O₅ is powerful dehydrating agent. Justify it with two chemical Equations.
• What is iodized salt?
• What is Halothane? Give its one use.
• What are interstitial compounds?
• Why Transition metals show variables valencies?

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

• Why vital force theory was rejected.
• What is natural gas write its two uses.
• Write the preparation of Alkane by clemmeson reduction method.
• How methane is converted into formaldehyde.
• Draw the structure of Nephthaline and Anthracine.
• Write two objections to Kekule formula of Benzene.
• Define Primary Alkyl Halids and secondary alkyl Halids give example of each.
• Why the reactivity of Alkyl Halids depends upon Bond Energy.
• How Ethyl Alcohol is denatured.
• Draw the structure of Lactic Acid and tartaric Acid.
• Define Ecosystem.
• Why "CO" Carbon monoxide is highly poisonous gas.

4. Attempt any SIX short questions. (6 x 2 = 12)

• Describe preparation of formalin on commercial scale from Methyl alcohol.
• How would you convert CH₃COOH to CH₃CONH₂.
• Define and give example of neutral amino acids.
• Give the classification of Polymers?
• Define condensation polymerization. Give the equation for the formation of polyester.
• What is a need for fertilizers?
• Give any two important qualities of fertilizer.
• Give reaction to produce – Hydroxy acid from aldehyde.
• Write the structure of amylopection.

SECTION-II

Attempt any THREE questions. (8 x 3 = 24)
Question#5
(a) Define Ionization Energy. How does it vary in the Group and period of the periodic table.
(b) Explain peculiar behaviour of Beryllium.

Question#6
(a) What are silicones? How are They produced? Outline two uses of silicones.
(b) How bleaching powder is prepared by Hasenclever's method?
Give its reaction with HC1 and NH₃.

Question#7
(a) Explain the following
(i) Reforming of alkanes
(ii) Cracking of alkanes.
(b) Complete the following chemical reactions.
CH,–CH, –C+ Na→?
CH₃ – CH₂ – OH +SOC₂—Pyridine?
CH₃ – CH₂ –C+ Na,Pb—>?
CH₃ —CH₂ — C + KOH _(aq)-->?

Question#8
(a) Discuss acidic nature of Alkynes.
(b) Write equations for the reactions of Acetaldehyde with.
(i) HCN 
(ii) CH₃ – CH₂ – MgBr
(iii) I₂/ NaOH
(iv) NH₂– NH – C₆H₅

Question#9
(a) Discuss Friedel crafts reaction with mechanism.
(b) Write brief note on Haloform reactions:

SECTION-III

Attempt any THREE questions.
Question#10
(a) Write complete qualitative analysis for lead (Pb₊₂ ) radical in asystematic manner.
(b) Write complete qualitative analysis for (Ca⁺²) calcium radical in a systematic manner.
(c) Write complete qualitative analysis for (CO₃^2-) carbonate radical in a systematic manner.
(d) How will you identify and confirm the aldehydic functional group in an organic
(e) Write materials/chemicals, chemical equation and procedure for prepration of Iodoform.