Time Allowed: three Hours Maximum Marks: 200
SECTION –A
1.
Answer any FOUR of the following:
(a)
Find the first –order rate constant for the disappearance
of A in the gaseous reaction 2 A →R, holding the pressure constant, the volume
of the reaction mixture starting with 80% A decreases by 20% in 3 min.
(b)
A solution contains 50% benzene, 30% toluene and
20% xylene by weight at 100˚C. The vapours are in contact with the solutions.
Calculate pressure and mole % composition of liquid and vapour:
Component vap. Pressure at MW
100˚C,
in mm Hg
Benzene
1340 78
Toluene 560 92
Xylene 210
106
(c)
Show that the internal energy of an ideal gas is
a function of temperature only.
(d)
For adiabatic batch reactor, derive an
expression to determine the time required to achieve a desired conversion.
(e)
Define Bubble point and dew point. Explain in
detail how to calculate bubble point or dew point of given binary mixture.
2.
The elementary reaction A +B →R + S are effected
in a setup consisting of a mixed reactor into which two reactant solutions are
introduced following by a PFR. A large enough of excess of B is used so that
the reaction is first order w.r.t. A. it is proposed to reverse the order of
two units. How does this change affect the conversion?
3.
A high purity limestone is burnt in a lime kiln
which is fired externally with a coal containing.75. 5% C, 5.5% H, 1.6% N,
1.1%S, 7.6% O and rest ash. The stack gas analysis is 20.2% Co₂, 7.1% O₂ and
rest N₂.
(a)
Kg limestone burnt/ kg of coal:
(b)
Excess air used for combustion.
4.
One mole of an ideal gas initially at P₁ and T₁
is compressed reversibly and adiabatically till the pressure is P₂ and then it
is called at constant volume to the initial pressure, finally the gas is restored
to the initial state through an isobaric process, Calculate the work done by the
process.
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