Chemistry Balochistan PCS Paper 2010

Table of Contents

BALOCHISTAN PUBLIC SERVICE COMMISSION

Samungli Road, Quetta Cantt.

COMBINED COMPETITIVE EXAMINATION FOR THE POSTS OF
BCMS/EB OFFICERS / SECTION OFFICERS B-17 IN THE S&GAD GOVT. OF BALOCHISTAN

CHEMISTRY

Time Allowed: 03 Hours

July 20, 2010 (02:00 PM)

Total Marks: 150

Note: Attempt any Five Questions, At least Two from each section. All questions carry equal marks.

SECTION – I (Physical)

Q-1.	(a)	Write two properties of X-Rays and how it’s helpful in calculating atomic size of element.
	(b)	Draw Structure of p-orbital.
	(c)	Draw molecular orbital configuration of N₂ and calculate bond order.
Q-2.	(a)	What are the applications of equilibrium constant and explain each with one example.
	(b)	State and explain Le-Chateliers principle.
	(c)	Calculate the molarity of glucose solution containing 18 gm per 250 dm³.
Q-3.	(a)	What is Raoult’s Law and how it is helpful in calculating molecular weight of solute.
	(b)	Name the colligative properties of the solution.
	(c)	Differentiate between polymers and polymorphism.

SECTION – II (Inorganic)

Q-4.	(a)	What is borax, explain borax bead test.
	(b)	What is hybridization and explain the formation of acetylene.
	(c)	Differentiate between hydration and hydrolysis.
Q-5.	(a)	Complete the following reactions, if occurs: Cu + HNO₃(dil) &rightarrow; ___________ KMnO₄ and Acidified FeSO₄ &rightarrow; ___________ Mg(NO₃)₂ (Heat) &rightarrow; ___________ KCl + I₂ &rightarrow; ___________ H₃BO₃(Heat) &rightarrow; ___________
	(b)	Write Short Notes on: i) Ring Test ii) Corrosion iii) Hydration
Q-6.	(a)	Name the following complexes: i) [Cu(NH3)4]⁺⁺ ii) [Fe(CO)5] iii) K4[Fe(CN)6] iv) [Cr(NO2)3(NH3)3]
	(b)	Draw electronic Structures of ClO4^–, H2SO4 and HClO3.
	(c)	Give Hybridization, geometry and magnetic properties of [Cu(NH3)4]⁺⁺ and [Fe(CN)6]^-3.

SECTION – III (Organic)

Q-7.

(a)

Convert the following:

Acetylene into benzene
Grignard’s Reagent into tert. Butyl Alcohol
Ethyl Bromide into Ethyl Amine
Ethene into ethylene glycol
Benzene into acetophenone

(b)

Write short notes:

i) Cracking of Petroleum ii) SN1 Reaction iii) Addition and Condensation Polymerization

Q-8.

(a)

Name the following:

                        i)

                        CH3 – CH2 – CH – CH2 – CH3

                                     |

                                    C2H5
                                  CH3

                                  |

                        ii) CH3 – C – CH2 – CH3

                                  |

                                  CH3
                        iii) CH3 – CH – CH – CH3

                                   |<   |

                                   OH  OH
                                  O

                                  ||

                        iv) CH3 – C – O – C2H5
                        v) 

                               /   \

                              |     | — OH

                               \   /

(b) Draw Structures of following:
i) Maleic anhydride. ii) Triphenyl methyl alcohol
iii) Acetic anhydride. iv) Calcium formate. v) Benzyl alcohol.
Q-9 Write short notes:
(a) Bakelite, a synthetic plastic.
(b) Aldol Condensation.
(c) Free radical mechanism of the chlorination of methane.
(d) Wurtz’s reaction.
Good Luck
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