RAWALPINDI BOARD 2012
CHEMISTRY
PART-2
Time: 20 MM.
(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.

• Formalin is:

(a) 10% solution of Formaldehyde in water
(b) 20% solution of Formaldehyde in water
(c) 40% solution of Formaldehyde in water
(d) 60% solution of Formaldehyde in water

• The sla si used for seasoning of food?'

(a) formic acid
(b) Acetic acid
(b) Benezoic acid
(d) Butanoic acid

• The fibre, made from acrylonitrile as monomer, is:

(a) PVC
(b) Rayon fibre
(c) Acrylic fibre
(d) Polyester fibre

• Ammonium Nitrate fertilizer is not used for the crop of:

(a) cotton
(b) wheat
(c) sugarcane
(d) paddy rice

• The main pollutant of leather tanneries in the waste water is due to the salt of:

(a) Lead
(b) Chromium (VI)
(c) Copper
(d) Chromium (III)

• The oxides of non-metals are:

(a) acidic
(b) amphoteric
(c) basic
(d) neutral

• Which of the following sulphates is not soluble in water?

(a) Sodium Sulphate
(b) Potassium Sulphate
(c) Ammonium Sulphate
(d) Barium Sulphate

• Which element is used in thermite process because of its activity?

(a) Fe
(b) Cu
(c) Al
(d) Zn

• Catalyst used in contact process is:

(a) Fe₂O₃
(b) Ag₂O
(c) Al₂O₃
(d) V₂O₅

• Strongest acid among the following is:

(a) HClO
(b) HClO₂
(c) HClO₃
(d) HClO₄

• The strength of binding energy of transition elements depends upon:

(a) number of electron pairs
(b) number of unpaired electrons
(c) number of neutrons
(d) number of protons

• A double bond consists of:

(a) two sigma bonds
(b) one sigma and one pi bonds
(c) one sigma and two pi bonds
(d) two pi bonds

• Vinyl Acetylene combines with HCI to form:

(a) Poly acetylene
(b) Benzene
(c) Chloroprene
(d) Divinyl Acetylene

• The conversion of n-hexane to Benzene by heating in presence of Pt is called:

(a) Isomerization
(b) Dealkylation
(c) Rearrangement
(d) Aromatization

• Bimolecular elimination reactions involve:

(a) first order kinetics
(b) second order kinetics
(c) third order kinetic
(d) zero order kinetics

• Which compound is more soluble in water?

(a) C₂H₅OH
(b) C₆H₅OH
(c) CH₃COCH₃
(d) n-Hexanol

• The carbon atom of carbonyl group is:

(a) sp-hybridized
(b) sp²-hybridized
(c) sp³-hybridized
(d) dsp²-hybridized

Time: 2:40 Hours
(Subjective Part)
Marks: 68
SECTION-I

2. Write short answer any Eight Parts.

• The second value of electron affinity of an element is usually shown with a positive sign. Explain with reasons.
  
• d and f block elements are called transition elements. Give reasons.
  
• Lithium is least reactive element of all alkali metals. Give reasons.
  
• what is role of Gypsum in industries?
  
• How lime mortar is prepared?
  
• What is chemical garden?
  
• How does ortho boric acid reacts with:
  
  • Ethanol
    
  • Sodium Carbonate
    
• Write down the structure of Carbon mono oxide.
  
• What are the commercial uses of halogens and their compounds?
  
• Write down the reaction of KMnO₄ with:
  
  • H₂ S
    
  • KOH
    
• Explain position isomerism with an example.
  
• There is no free rotation around a double bond and a free rotation along a single bond. Give reasons.

3. Write short answer any Eight Parts.

• Describe ring test for the confirmation of the presence of Nitrate ions in the solution.
  
• How does HNO₂ act as a reducing agent?
  
• Write down the structural formula of the given compounds.
  
• (i) 2,2-Dimethyl Hexane
  
• (ii) 4-lso-propyl heplane
  
• How does Ethyne reacts with:
  
  • Hydrogen
    
  • Halogen acid
    
• What is meant by the terms:
  
  • Aromatic
    
  • Oxidation
    
• Why benzene is less reactive than alkenes although it has three pi (π) bonds in it?
  
• What products are formed when Ethyl magnesium bromide is treated with:
  
  • HCHO
  • CO₂
• Define electrophile and nucleophile. Give one example of each.
  
• What is the use of lodoform test to distinguish between Acetaldehyde and Formaldehyde?
  
• How does Acetaldehyde react with the given reagents.
  
  • dilute NaOH
    
  • NH₂OH
    
• Explain the term Condensation Polymerization.
  
• Write down the structural formula of cholestrol.

4. Write short answer any Six Parts.

• Prepare diethyl ether by Williamson's Synthesis.
  
• Why Ethyl alchol is liquid while Ethyl chloride is gas at room temperature?
• Convert Ethanol into Isopropyl alcohol.
  
• Arrange the given compounds in order of increasing acid strength. H₂O,C₂H₅OH, phenol, Benzoic acid.
  
• Write down four uses of Acetic acid.
  
• What is meant by polypeptide and protein?
  
• Give percentage of Nitrogen in Urea, Ammonium Nitrate, Diammonium hydrogen phosphate and KMnO₃.
  
• What do you mean by Calcarious materials and Argillaceous materials used for manufacture of cement?
  
• How do Leather Tanneries pollute the water?

SECTION-II

5. (a) What are periods? Describe different periods of the periodic table.
(b) How sodium metal is prepared commercially by Down's Cell?

6. (a) What is meant by a functional group? Write names and classes of four oxygen containing functional gruops. 
(b) What are nucleophillic substitution reactions? Discuss SN2 mechanisms.

7. (a) What is Markovvnikov's Rule? Give two examples.
(b) Explain Cannizzana's Reaction.

8. (a) Prepare the following compounds from Benzene in two steps.

• m-chloronitrobenzene
  
• p-chloronitrobenzene

(b) Give preparation of Carboxylic acid by the following methods:

• from Alkyl Nitriles
  
• from Grignard reagents
  
• by the hydrolysis of Esters
  
• by the oxidative cleavage of alkenes

9. (a) How water is purified i.e., made potable by aeration and coagulation?
(b) Give systematic names to the following complexes. 

• [Fe(Co)₅]
  
• [Co(NH₃)6] Cl₃
  
• Na₃ [CoF₆]
  
• K₂ [Cu(CN)₆ ]