GUJRAWALA BOARD 2012
PAPER CHEMISTRY PART-II
Time: 3:10 Hours
(Objective )
Marks: 17
Section II
Note: You have for choice for each objective type question as A, B, C are D. The choice which you think is correct, fill that circle in front of that question number with marker or pen on the answer book provided. Cutting or tilling two or more circle will result in zero mark in that question. Attempt as questions as given in objective type question paper and leave others blank. Write the letter A, B , C and D in the column (write correct option) against each question. If there is a contradiction in the bubble and hand written answer, bubble option will be considered correct.

Question#1

• Silver minor is given by
  
  (A) aldehydes
  (B) ketones
  (C) ethers
  (D) acids

• Grignard reagent is reactive due to:
  
  (A) the presence of Mg atom
  (B) the presence of halogen atom
  (C) the polarity of C-Mg bond
  (D) C-C bond
  
  
• Chlorophene is used for making:
  
  (A) rubber
  (B) petrol
  (C) propane
  (D) liquid fuel
  
  
• The colour of the transition metal complexes is due to:
  
  (A) d-d transition of electrons
  (B) paramagnetic nature of transition elements
  (C) ionization
  (D) loss of s electrons
  
  
• Tincal is a mineral of:
  
  (A) B
  (B) Al
  (C) Si
  (D) C
  
  
• The basic of Modern Periodic Law is:
  
  (A) electron affinity
  (B) atomic mass
  (C) ionization energy
  (D) atomic number
  
  
• The pH range of the acid rain is:
  
  (A) 6.5-7
  (B) -7-6.5
  (C) less than 5
  (D) 6-5.6
  
  
• Which is a synthetic polymer?
  
  (A) animal fat
  (B) cellulose
  (C) starch
  (D) polyester
  
  
• Methyl ketones are characterized by:
  
  (A) Tollen's reagent
  (B) lodoform test
  (C) Benedict's reagent
  (D) Fehling solution
  
  
• Alcohol obtained by fermentation never exceeds:
  
  (A) 10 %
  (B) 16 %
  (C) 14 %
  (D) 95 %
  
  
• Nitration of toluene takes place at:
  
  (A) m-position
  (B) P-position
  (C) O-position
  (D) both O-position and P-position
  
  
• The state of hybridization of carbon in ethane is:
  
  (A) sp³
  (B) sp²
  (C) sp
  (D) dsp²
  
  
• Which is Chile saltpetre?
• 
  (A) K₂SO₄
  (B) NaNO₃
  (C) Na₂SO₄
  (D) KNO₃
  
  
• Which catalyst is used in cantact process?
  
  (A) Fe₂O₃
  (B) V₂ O₅
  (C) Na₂SO₄
  (D) Ag₂O
  
  
• Phosphorus helps the growth of:
  (A) seed
  (B) root
  (C) leaves
  (D) stem
  
  
• Suffix used in the naming of carboxylic acid is:
  
  (A) —ene
  (B) — al
  (C) — ane
  (D) — oic
  
  
• Which halogen is used as an insecticide?
  
  (A) Br₂
  (8) l₂
  (C) Cl₂
  (D) F₂

INTER (II)
GUJRAWALA BAOARD 2012
Chemistry Paper II
Time: 2:40 Minutes
marks:68
SUBJECTIVE
Note: Section 1 is compulsory. Attempt any three (3) questions from Section II

2. Write short answers to any EIGHT questions: (2x8 = 16)

• Why Na₂O is basic, but P₂O₅ is acidic in character in spite of the fact that both sodium and phosphorus arc are present in same period?
• How do you justify the position of hydrogen at the top of the group I A of the periodic table? Write at least four points.
• What is the lime mortar and what change occur when it hardens during hydrolysis?
• How Plaster of Paris is formed? Give its two uses.
• Why calcium is essential for the normal development of plants?
• What is vitreous silica? Give its two uses.
• How borax is commercially prepared? Give two methods of preparation.
• What is the effect of temperature at 340⁰C and 470⁰C when red lead is headed?
• Why fluorine ads as a strong oxidizing agent?
• What is tin plating and what happens when it is damaged?
• Why there is a free rotation amend a single bond, but no fire rotation around a double bond?
• What are homocyclic and heterocyclic compounds? Give an example of each.

3. Write short answers to say EIGHT gentians: (28=16)

• What is aqua regia? How does it dissolve gold?
• Write balanced equations for the reactions of HNO₂ with
  (i) HI
  (ii) CO(NH₂)₂
• State Markownikov's rule. Give an example.
• Define hydrogenation. Give its two applications.
• Give two reasons to rule out straight chain structure of benzene.
• What are polycyclic aromatic hydrocarbons? Give examples.
• Why alkyl halides are reactive than alkanes?
• Give two examples of nucleophilc substitution reactions.
• Write mechanism for the addition of sodiumbisulphite to an aldehyde.
• What is haloform reaction.
• Give four properties of enzymes.
• What is iodine number?

4. Write short answers to any SIX question: (2x6 = 12)

• How ethanol is denatured?
• Write down formulas for
  (a) price acid
  (b) Methoxy benzene.
• Write down reactions of phenol with
  (a) Zn/ Heat
  (b) acetyl chloride/ NaOH
• Write down any four uses of ethanol.
• Write down formulas ti
  (a)palmitic acid
  (b) stearic acid
• What are amino acids?
• What are primary pollutants and secondary pollutants atmosphere?
• What are the common bleaching agents used in paper industry in Pakistan?
• Write down formulas for
  (a) super phosphate
  (b) triple phosphate

(Section — II)

Question#5
(a) Define hydrides. Give their classification and properties. 4
(b) Discuss the role of gypsum in industry. 4

Question#6
(a) Define functional group. Give names and forrnuliis of oxygen containing functional groups. 4
(b) What are S_N reactions? Differentiate between S_N 1 and S_N2 reactions. 4

Question#7
(a) Synthesize (i) oxalic acid (ii) methyl nitrile (iii) acetaldehyde (iv) acrylonitrile starting from ethyne. 4
(b) Prepare acetaldehyde cyanohydrin from acetaldehyde and then convert it into 2- hydrovpropanoic acid. 4

Question#8
(a) Describe the Friedel-Crafts acylation of benzene with mechanism. 4
(b) Write down the mechanism of conversion of acetic acid to (i) acetyl chloride (ii) 4

Question#9
(a) Explain open hearth process for the manufacture of steel. 4
(b) What do you mean by 'Smog'? Discuss its types and give conditions for formation of smog. 4