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If k is the rate constant for a reaction and T is the absolute temperature in the given figure, the activation energy for the reaction is . . . . . . . . J/K mole.<br><img src="/images/question-image/metallurgical-engineering/metallurgical-thermodynamics-and-kinetics/1684343271-M2-B-18-30.PNG" title="Metallurgical Thermodynamics and Kinetics mcq question image" alt="Metallurgical Thermodynamics and Kinetics mcq question image">
A
1000
B
2000
C
4155
D
8314
Correct Answer:
8314
If 'Δx' represents adherent oxide layer thickness and 't' is time, which of the following curves represents diffusion controlled oxidation kinetics?
A
P
B
Q
C
R
D
S
Select the correct plot of Gibbs free energy (G) Vs. Temperature (T) for a single component system from the following:
A
P
B
Q
C
R
D
S
For the reaction, A = X + Y, the respective concentrations are C
A
, C
X
and C
Y
. The forward reaction rate constant is kf and the backward reaction rate constant is kb. Choose the correct statement from the following:
P. At equilibrium, kf C
A
> k
B
CxCy
Q. If the reaction is irreversible than, kb C
X
C
Y
= 0
R. The backward reaction rate will essentially be first order, if the forward reaction rate is first order.
S. Activation energy for the first order forward reaction will be independent of temperature.
A
P, Q
B
Q, R
C
R, S
D
Q, S
The rate expression for a heterogenous catalytic reaction is given by, - r
A
= K.K
A
P
A
(1 + K
A
.P
A
+ K
r
.P
R
), where K is surface reaction rate constant and K
A
and K
R
are absorption equilibrium constants of A and R respectively. If K
R
P
R
>> (1 + K
A
P
A
), the apparent activation energy E
A
is equal to (given E is the activation energy for the reaction and ΔH
R
and ΔH
A
are the activation energies of adsorption of R and A)
A
E
B
E + ΔH<sub>A</sub>
C
E + ΔH<sub>A</sub> - ΔH<sub>R</sub>
D
ΔH<sub>A</sub> + ΔH<sub>R</sub>
A piston containing an ideal gas is originally in the state X (see figure). The gas is taken through a thermal cycle X → Y → X as shown
The work done by the gas is positive, if the direction of the thermal cycle is
A
clockwise
B
counter-clockwise
C
neither clockwise nor counter-clockwise
D
clockwise from X → Y and counter-clockwise from Y → X
Consider the figures of a metal ball and a metal ring given below.
The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
A
The ball can still pass through the ring as diameter expands on heating
B
The ball gets stuck because of the diameter of the hole decrease on expansion
C
The ball will still pass through because the hole diameter does not change
D
The ball will pass through because there is no change in the ring
The steady-state creep activation energy is given by the Arrhenius type rate equation ε = Ae-(Q/RT), where, Q = activation for rate-controlling step A = pre-exponent complex constant containing the frequency of vibration of the flow unit T = absolute temperature R = Universal gas constant The slope of the equation for log ε vs. log T plot will be equal to __________
A
Q/R
B
Q/2.3R
C
A/Q
D
A/2.3R
In the following reaction,
the absolute configurations of the chiral centres in X and Y are
A
2S, 3R and 2R, 3R
B
2R, 3R and 2R, 3S
C
2S, 3S and 2R, 3R
D
2S, 3R and 2S, 3R
Select the alternative figure which is embedded in the given figure (X).
A
1
B
2
C
3
D
4
Select the alternative figure which is embedded in the given figure (X).
A
1
B
2
C
3
D
4
