PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF PROVINCIAL MANAGEMENT SERVICE-2020
SUBJECT: CHEMISTRY (PAPER-I)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:I. All the parts (if any) of each Question must be attempted at one place instead of at different places
II. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
III. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
IV. Extra attempt of any question or any part of the question will not be considered.
Attempt FIVE Questions in all. Attempt in Urdu or English.
Q. No.1 (a) Define the Concentration, activity and activity coefficient
(b) Discuss the importance of Gibbs free energy in chemistry
(c) What is radioactivity and how it is measured? (3+7+10-20)
Q. No.2 (a) Define the 1st low of thermodynamics and derive its mathematical expression
(b) What is a nuclear reaction? Differercute between fision and fusion reaction (10+10=20)
Q. No.3 (a) Define the equalent and molar conductance. How they are measured?
(b) Differentiate between
i. Potential and potential difference
ii. Normal hydrogen and glass electrode
(c)What is pH and how it is measured? (10+4+6 =20)
Q. No.4 (a) Explain the relationship between free energy and brum constant
(b) How diammonium phosphate fertillizer is prepared?
(c) How caustic soda is perpened and obtained in sold form? (5+5+10=20)
Q. No.5 (a) What are cheslates? Draw structure of the chelate
(b) What is the difference between VBT and CFT?
(c) Define the transition element, where they are found the periodic table and discuss thier lonic configuration (5+5+10=20)
Q. No.6 (a) Define hybrid orbital, bond order and metallic bond
(b) What is molecular orbital theory?
(c) Differentiate between lonic and covalent bonds
d) Draw the molecular orbital diagram of O2 molecule and discuss its paramagnetic nature. Also discuss the non-existence of hellum molecule on the basis of Molecular Orbital Theory (3+3+4+10-20)
Q. No.7 (a) Define eigen function and egen value
((b) Derive schrodinger wave function and discuss its physical significance.
(c) Explain the Tunnel Effect (2+10+8=20)
Q. No.8 (a) Explain briefly the advantages and disadvantages of supplying sewerage and sludge to the agriculture soil
(b) State and explain the Debyfuckel theory. How it can be applied to the strong electrolyte (10+10=20)