BALOCHISTAN PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION 2021
FOR RECRUITMENT TO THE POSTS OF
ASSISTANT COMMISSIONER/SECTION OFFICER (B-17)
IN THE SERVICES & GENERAL ADMINISTRATION DEPARTMENT
CHEMISTRY
July 07, 2021
Total Marks 150
Time Allowed 03 Hours
NOTE
i Attempt five questions, at least one question from each section All questions carry equal marks
ii All the parts (if any) of each Question must be attempted at one place instead of at different places
iii Candidate must write Q No in the Answer Book in accordance with Q No in the Q Paper
iv No Page/Space be left blank between the answers All the blank pages of Answer Book must be crossed
v Extra attempt of any question or any part of the attempted question will not be considered
SECTION-I (Physical chemistry)
Q No 1 a Describe different types of solution? Explain Henry’s law and its limitations (15)
b State and explain Le-Chatelier’s principle with its applications (15)
Q No 2 a State first law of thermodynamics? Explain its applications (15)
b Define electrochemistry. Explain the types of electrochemical cells (15)
Q No 3 a What is the order of reaction? Determine the rate of first order reaction (15)
b Write a note on artificial radioactivity (15)
SECTION-II (Inorganic chemistry)
Q No 4 a What is valence bond theory explain in detail? (15)
b Explain molecular orbitals for any three homonuclear diatomic molecules (15)
Q No 5 a Define Cement. How is it manufactured on industrial scale by wet process? (15)
b Define electronegativity. Explain its trend in periodic table (15)
Q No 6 a What is hybridization? Explain and compare the hybridization of CH4 and NH3 (15)
b How coordination complexes differ from simple salts? Mention basic properties of coordination complexes (15)
SECTION-III (Organic chemistry)
Q No 7 a Write the preparation of primary, secondary and tertiary amines (15)
b Discuss resonance effect among the following (15)
i Phenol ii Aniline iii Chlorobenzene
Q No 8 a Explain general mechanism involved in Electrophilic substitution reactions (15)
b Define stereoisomerism. Give a brief account on conformational isomerism with reference to ethane (15)
Q No 9 a Differentiate between primary, secondary and tertiary alcohols (15)
b Write down the structure, occurrence and biological importance of monosaccharides (15)
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