Set “A”
BGMEA University of Fashion & Technology (BUFT)
Written Examination: Spring Semester–2020
Department: Department of Textile Engineering
Program: B.Sc. in Textile Engineering
Course Code: CHEM1103
Course Title: General and Physical Chemistry
Batch: 201
Sections: 3 & 4
Time allowed: 03 hours
Full Marks: 30
N.B: Figures in the right margin indicate marks for each question.
There are Four questions. Answer any Three question(s).
Q. 1. (a) Deduce Kinetic Equation PV = 1/3 mnc2 for gases.
(b) Explain an ideal gas and a real gas with reference to
Amagat’s curve.
(c) What are the two main causes of deviation of real gases
from ideal behaviour.
6
2
2
Q. 2. (a) State the Law of Mass Action. Establish the relation between
Kp and Kc.
5
(b) Phosphorous pentachloride when heated dissociates as
PCl5
<=>
PCl3 + Cl2
3
Calculate the equilibrium constant Kp of the reaction.
(c) Explain with the help of Le Chatellier’s Principle, the effect of
temperature on the reaction:
N2 (g) + 3H2 (g) < => 2NH3 (g) + 22.0 Kcal.
2
Q. 3. (a) Define “Order of a Reaction”. Deduce mathematical
formulation of First Order Reaction.
(b) Prove that 𝑡1 of a First Order Reaction is independent of
5
2
concentration.
(c) The rate constant for the decomposition of N2O5 at 45oC
is 4.80 x 10-4/s, calculate the Half-Life.
Q. 4. (a) Explain Brønsted -Lowry and Lewis theory of acids and
bases.
3
2
5
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(b) Define neutralization reaction. What is indicator? Give two
examples.
3
(c) A sample has hydrogen -ion concentration of 7.5 x 10-3 M.
What is the pH of sample?
2
END OF THE PAPER
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