FAISALABAD BOARD 2012
PAPER CHEMISTRY PART-11
Time: 20 Min
(Objective Part2)
Marks: 17
Note: Four answer are given against each question columns A.B.C and D. Select the right answer and on the separate Answer Sheer, fill the circle A, B, C or D with pen or marker in front of that question number.

•  During nitration of benzene, the active nitrating agent is:

(a) NO₃
(b) NO₂⁺ 
(c) NO₂^- 
(d) HNO₃

• Formation of acetaldehyde from ethanol is known as:

(a) Reduction
(b) Addition
(c) Oxidation
(d) Substitution

• Grignard's reagent is reactive due to

(a) The presenceo of halogen atom
(b) The presence of Mg atom
(c) The polarity of-Mg boni'
(d) The polarity of Mg-X bond

•  In the Mendeleev's periodic law the properties of elements are periodic function of their: 

(a) Volume
(b) Densities
(c) Atomic number
(d) Atomic masses

• Oxidation of NO in air produces:

(a) N₂O
(b) N₂O₃
(c) N₂O₅
(d) N₂O₄

•  Peroxy acetyl nitrate (PAN) is an irritant to human beings and it effects:

(a) Eyes
(b) Ears
(c) Stomach
(d) Nose

• Plaster of Pairs can be obtained from:

(a) Marble
(b) Bauxite
(c) Gypsum
(d) Limestone

• The compound which is more soluble in water:

(a) C₆H₅OH
(b) C₇H₅OH
(c) C₆H₁₃OH
(d) C₆H₁₅OH

• The nitrogen present in some fertilizers helps plants to:

(a) Fight against diseases
(b) Produces fat
(c) Undergo photosynthesis
(d) Produce protein

• The state of hybridization of carbon in ethane is:

(a) sp³
(b) sp²
(c) sc
(d) dsp²

•  Which acid is used in the manufacture of synthetic fibre?

(a) Formic acid
(b) Oxalic acid
(c) Carbonic acid
(d) Acetic acid

•  Which compound will not give iodoform test on treatment with I₂| NaOH ?

(a) Acetaldehyde
(b) Acetone
(c) Butanone
(d) 3-pentanone

• Which is a non typical transition element?

(a) Cr
(b) Mn
(c) Zn
(d)  Fe

• Which is the strongest acid?

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

•   Which metal is used in the flash light photography because of its activity?

(a) Iron
(b) Copper
(c) Aluminium
(d) Zinc

•  Which polymer is an addition polymer?

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

• Which type of reactions are given by alkanes?          

(a) Polymerization
(b) Elimination
(c) Substitution
(d) Addition

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

Q.2.Write short answer any Eight Parts. 16

• Why is oxidation state of noble gases usually zero?
• Why is the metallic character increase down the group of s-block elements?
• What is function of calcium in plant growth?
• Why is CaCℓ₂ added in molten NaCℓ in down's cell?
• What are main uses of Plaster of Pairs?
• Write names and formulae of different acids of boron.
• Give reactions of aluminium with dilute and concentrated H₂SO₄?
• What is chemical garden?
• Compare halogen acids in their reducing properties.
• How does K₂Cr₂O₇ act as an oxidizing agent in presence of H₂SO₄?
• Define reforming or petroleum. Give one example.
• What is isomerism? Give names of four types of structural isomerism.

Q.3.Write short answer any Eight Parts. 16

• How aqua regia dissolve gold and platinum?
• Give uses of H₂SO₄.
• Write structural formulas of (i) 1. 3 - Pentadiene (ii) Vinyl bromide.
• Why alkanes are less reactive than alkenes?
• Convert benzene to maleic acid.
• Give the mechanism of sulphonation of benzene.
• Give the importance of Girgnard's reagents,
• Explain terms: (i) Leaving group (ii) Electrophile
• Write Fehling's solution test,
• Write methods to prepare formaldehyde and acetaldehyde.
• What are epoxy resins? Give their uses.
• Explain denaturation of protein.

Q.4.Write short answer any Six Parts. 12

• Define fermentation. Give one example.
• Why phenol is acidic while alcohol is not?
• How does ethyl alcohol react with the following reagents?

            (i)         Conc.H₂SO₄                (ii)        PCℓ₅

• Write down two methods for the preparation of phenol.
• What is the difference between peptide and proteins?
• Give four uses of acetic acid.
• Define paper. Give important raw material for the manufacture of paper.
• What reaction takes place in the setting of cement from 01 to 07 days?
• What is chemical oxygen demand demand (COD)? How it is measured?

SECTION-II

Q.5.(a) Why diamond is non-conductor and graphite is felt good conductor? 04

(b) Discuss four functions of gypsum in plant growth.04       

Q.6.(a) Define any four types of isomerism with one example each. 04

(b)Distinguish between SN¹ and SN² reactions by at least four points each. 04

Q.7.(a) Write rite balanced equations for the reactions of ethene with:04

• O₂ / Ag
• S₂Cℓ₂
• KMnO₄
• HOCℓ 

(b).Define aldol cendensatin. Give its mechanism.04

Q.8.(a) Complete the following reactions. Also mention the conditions needed to carry out these reactions. 04

(b).What are essential and non-essential amino acids? Briefly describe the strecker synthesis for ^a— amino acid. 04

Q.9.(a) Describe Bessemer's process for the manufacture of steel. 04

(b) Describe natural and human activities that cause air pollution due to the following: 04

• Carbon monoxide
• Hydrocarbons.