RAWALPINDI BOARD 2014
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.

• When CO₂ is made to react with ethyl magnesium iodide followed by acid hydrolysis, the product formed is:

(a) Propane
(b) Propanoic acid
(c) Propanal
(d) Propanol

• Carbolic acid is:

(a) Phenol
(b) Methanol
(c) Carbonic acid
(d) Chloroform

• Cannizzaro's reaction is not given by:

(a) Formaldehyde
(b) Acetaldehyde
(c) Benzaldehyae
(d) Trimethyl acetaldehyde

• Which of the following is not an aminoacid?

(a) Aspartic acid
(b) Lysine
(c) Alanine
(d) Aniline

• Which of the following elements is not present in all proteins?

(a) Carbon
(b) Hydrogen
(c) Nitrogen
(d) Sulphur

• Which three elements are needed for the healthy growth of plants?

(a) N,S,P
(b) N,Ca,P
(c) N,P,K
(d) N,K,C

• Ecosystem is a smaller unit of:

(a) Lithosphere
(b) Hydrosphere
(c) Atmospher
(d) Biosphere

• Which one is ionic hydride?

(a) NaH
(b) AIH₃
(c) NH₃
(d) CH₄

• Hydrogen resembles in properties with groups:

(a) I-A, V-A, VII-A elements
(b) I-A, IV-A, VII-A elements
(c) II-A, III-A, V-A elements
(d) I-A, II-A, elements

• Chile saltpetre has the chemical formula:

(a) NaNO₃
(b) KNO₂
(c) Na₂B₄O₇
(d) Na₂CO3H₂O

• The chief ore of aluminium is:

(a) Na₃AlF₆
(b) Al₂O₃.2H₂O
(c) A1₂O₃
(d) A1₂O₃.H₂O

• Langhing gas is chemically:

(a) NO
(b) N₂O
(c) NO₂
(d) N₂O₄

• The anhydride of HClO₄ is:

(a) ClO₃
(b) ClO₂
(c) C1₂O₅
(d) Cl₂O₇

• Co-ordination number of Pt in [PtCl(NO₂)(NH₃) ] is:

(a) 2
(b) 4
(c) 1
(d) 6

• Which one is alcohol in the following?

(a) CH₃CH₂OH
(b) CH₃OCH₃
(c) CH₃COOH
(d) CH₃CH₂ — Br

• Vinyl acetylene combines with HCI to form:

(a) Polyacetylene
(b) Benzene
(c) Chloroprene
(d) Divinyl acetylene

• Which compound is the most reactive?

(a) Benzene
(b) Ethene
(c) Ethane
(d) Ethyne

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

2. Attempt any EIGHT short questions.

• The first electron affinity of oxygen is in negative figures but the second one is positive, why?
  
• Diamond is a non-conductor and graphite is a good conductor. Give reason. How portland cement is made? Why gypsum is added in the cement?
  
• How will you prepare Borax from "colemanite" and "Boric acid"?
  
• NO₂ is strong oxidizing agent. Prove with the help of two chemical reactions. Give molecular structure of red phosphorous. How it is prepared from white phosphorous?
  
• What are Freons? Give its uses.
  
• CO₂ is a gas while SiO₂ is a solid at room temperature, why?
  
• Write four properties of hydrogen flouride.
  
• Which elements and compounds can as semiconductors?
  
• How XeF₂ and XeF4 can be prepared?
  
• Give reactions of conc. H₂SO₄ with oxalic acid and formic acid.

3. Attempt any EIGHT short questions.

• What are Interstitial compounds?
  
• Under what conditions aluminium corrodes?
  
• What is vital force theory?
  
• Define Metamerism.
  
• What is Lindlar's catalyst? Where it is used?
  
• Why π— bond is more reactive than σ— bond?
  
• Why aldehydes are more reactive than ketones?
  
• What is sodium nitroprusside test?
  
• Give preparation of Acetal.
  
• What is the degree of polymerization?
  
• Define saponification number.
  
• Give the importance of Lipids?

4. Attempt any SIX short questions.

• Ethanol gives different products with Conc. H₂SO₄ under different conditions. Justify it.
  
• Iodoform test can be used to distinguish between methyl alcohol and ethyl alcohol. Justify it.
  
• Give different zones in rotary kiln and their temperature range.
  
• Give the mechanism of nitration of benzene.
  
• What is Grignard's reagent? How is it prepared?
  
• What are fertilizers? Why are they needed?
  
• Write down the major components of paper machine.
  
• How chloroflorocarbons destroy the ozone layer?
  
• What is Biochemical Oxygen Demand (BOD)?

5. (a) Give the periodic trend of ionization energy and electron affinity in the periodic table.
(b) Describe the manufacture of sodium by Down's cell.

6. (a) Explain isomerism and its various types with examples.
(b) Define and distinguish with examples SN₁ and SN₂ reactions.

7. (a) Show by two reactions that ethene and ethyne are unsaturated. How can they be distinguished from each other?
(b) What is glacial acetic acid? Write down any three methods to prepare acetic acid.

8. (a) Describe the structure of benzene on the basis of reasonance method.
(b) How will you convert:

• Ethanol into Methane
  
• Ethanol into Ethanol
  
• Ethanol into Ethene
  
• Ethanol into diethyl ether.

9. (a) What is galvanizing or anode coating?
(b) What is smog? Explain the pollutants which are the main cause of photochemical smog.

SECTION-III

Attempt any THREE questions. (5X3=15)

10.
(a)

• Write down any two confirmatory tests for acetate radical.
  
• Describe chromyl chloride test for chloride radical.

(b)

• Write down two confirmatory tests for Al₃⁺ radical.
  
• Describe filter ash test.

(c)

• Write down any two confirmatory tests for Zn₂⁺ radical.
  
• How will you perform Borax bead test.

(d)

• Write down the materials required, chemical equation and procedure for preparation of Aspirin.

(e)

• How will you detect sulphur and halogens in an organic compound?