RAWALPINDI BOARD 2013
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.

• Which enzyme is not a involved in fermentation of strach?

(a) Diastase
(b) Zymase
(c) Invertase
(d) Urease

• Which of the following reagents will react with both aldehydes and Ketones?

(a) Grignard's reagent
(b) Tollen's reagent
(c) Fehling's reagent
(d) Benedict's reagent

• Acetone reacts with HCN to from a cyanohydrin . It is an example of :

(a) Electrophilic addition
(b) Electrophilic substitution
(c) Nucleophilic addition
(d) Nucleophilic substitution

• Which of the following is not a fatty acid?

(a) Propanoic acid
(b) Acetic acid
(c) Phthalic acid
(d) Butanoic acid

• Which of these polymers is an addition polymer?

(a) Nylon-6,6
(b) Polystyrene
(c) Terylene
(d) Epoxy resin

• During manufacturing process of cement chamber in the incineration of industrial and hazardous waste process is :

(a) 600°C
(b) 800°C
(c) 1000°C
(d) 1200°C

• The temperature range in non-rotating chamber in the incineration of industrial and hazardous waste process is:

(a) 900-1000°C
(b) 250-500°C
(c) 950-1300°C
(d) 500-900°C

• Choose the correct statement.

(a) Metallic character increase down the group
(b) Metallic character increases from left to right in a period.
(c) Metallic character remains the same from left to right in a period.
(d) Metallic character decrease down the group.

• Which element is deposited at cathode during electrolysis of brine?

(a) H₂
(b) Na
(e) Cl₂
(d) O₂

• Which of the flowing elements is not pesent abundantly in earth crust?

(a) Silicon
(b) Aluminium
(c) Sodium
(d) Oxygen

• Which of the following species has the maxmum number of unpaired electrons?

(a) O₂
(b) O₂⁺¹
(c) O₂^-1
(d) O₂^-2

• Bleaching powder may be produced by passing Cl2 over:

(a) Calcium carbonate
(b) Hydrated Calcium Sulphate
(c) Anhydrous Calcium sulphate
(d) Calcium Hydroxide

• Group VIB of transition elements contains:

(a) Zn, Cd, Hg
(b) Fe, Ru, Os
(c) Cr, Mo , W
(d) Mn, Te, Re

• Linear shape is associated with which set of hybrid orbitals?

(a) sp
(b) sp²
(c) sp³
(d) dsp²

• Synthetic rubber is made by polymerization of :

(a) Chlorofrom 
(b) Acetylene
(c) Diviny acetylene
(d) Chloroprene

• Which of the following acid can be used as a catalyst in Friedel Craft reaction?

(a) AlCl₃
(b) HNO₃
(c) BeCI₃
(d) NaCI

• Which one of the following is not a nucleophile?

(a) H₂O
(b) H₂S
(c) BF₂
(d) NH₂

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

2. Attempt any EIGHT short questions.

• In what respects does hydrogen differ from halogens? Write down two dissimilarities.
  
• The first electron affinity of oxygen is negative, but the second is positive.
  
• When sodium reacts with water, the hydrogen so evolved catches fire. Why?
  
• What are the advantages of Down's cell for the preparation of sodium on commercial scale?
  
• Describe "Ring Test" for the confirmation of the presence of nitrate ions in solution.
  
• How does HNO₂ act as a reducing agent?
  
• Prove that P₂O₅ is the dehydrating reagent.
  
• Give the important applications of Hellium
  
• What are Chelates?
  
• Give the mechanism of Ozonolysis of ethene.
  
• Why the aqueous solution of Na₂CO₃ is alkaline in nature?
  
• What is Baeyer's test to check the presence of carbon carbon double bond?

3. Attempt any EIGHT short questions.

• Borate glazes are better than silicate glazes. Explain .
  
• Write a note on Borax Bead test.
  
• What is the vital force theory?
  
• Write down names and possible structures of isomers of xylene.
  
• What is elimination reaction? Give an example.
  
• What is leaving group? Give examples.
  
• How would you prepare Phenol by Dow's process?
  
• What is an amino acid? Draw its structure.
  
• Write down important uses of organic compounds in our daily life.
  
• What happens when benezene vapours are passed over heated V₂O₅?
  
• Write down structural formulas of sodium phenoxide and methoxy ethane.
  
• How would you convert acetic acid into methane and acetic anhydride?

Attempt any SIX short questions.

• Justify that Cannizzaro's reaction is a self-redox reaction.
  
• Define nucleophilic addition reaction with an example.
  
• Detergents are threat to aquatic life . Explain .
  
• What is iodofrom test? Illustrate with an example.
  
• Give Fhling's solution, text with an example.
  
• What are epoxy resins? Give their importance.
  
• Define saponification number.
  
• Write a short note on micro-nutrients.
  
• Explain the importance of potassium fertilizer.

Attempt any THREE questions.

5. (a) Define Ionization energy. How does it differ along the period and down the group of periodic table.
(b) What are four main difference of Be metal with other members of its group?

6. (a) Define cracking and discuss its different types.
(b) What is Aldol condensation? Write down its mechanism using as Catalyst?

7. (a) Explain the addition reactions of ethene with example.
(b) Define elimination reactions and discuss the mechanism of E₂ reactions.

8. (a) Describe with mechanism the Friedel Craft's Acylation.
(b) Write down reaction between acetic acid and ethanol in the presence of H₂SO₄ and also give mechanism of this reaction.

9. (a) Write down the rules for naming complex compounds.
(b) Explain how pesticides are dangerous to human being?