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For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate -r<sub>A<sub>0</sub></sub> is invariant with total pressure. The rate controlling step is
A
Surface $$\frac{{{{\text{K}}_{\text{C}}}}}{{1 + {{\text{T}}_{\text{S}}}}}$$ reaction between absorbed A and B in the gas phase
B
Surface reaction between absorbed A and absorbed B
C
Surface reaction between A in the gas phase and absorbed B
D
Desorption of C
Correct Answer:
Desorption of C
An electronic device rearranges numbers step-by-step in a particular order according to set of rules. The device stops when the final result is obtained.
Input: 84 15 35 04 18 96 62 08
Step 1: 96 84 15 35 04 18 62 08
Step 2: 96 84 62 15 35 04 18 08
Step 3: 96 84 62 35 15 04 18 08
Step 4: 96 84 62 35 18 15 04 08
Step 5: 96 84 62 35 18 15 08 04
And Step 5 is the last step for this input. Now, find out an appropriate step in the following question following the above rule. Question:
Input: 16 09 24 28 15 04
What will be the third step for this input ?
A
28 24 15 16 04 09
B
28 24 16 15 09 04
C
24 28 15 16 09 04
D
28 24 16 15 04 09
An electronic device when fed with the numbers, rearranges them in a particular order following certain rules. The following is a step-by-step process of rearrangement for the given input of numbers. Input :- 85 16 36 04 19 97 63 09 Step I :- 97 85 16 36 04 19 63 09 Step II :- 97 85 63 16 36 04 19 09 Step III :- 97 85 63 36 16 04 19 09 Step IV :- 97 85 63 36 19 16 04 09 Step V :- 97 85 63 36 19 16 09 04 (for the given input step V is the last step). Which of the following will be the last step for the given input ? Input :- 03 31 43 22 11 09
A
IV
B
V
C
VI
D
None of these
The rate of the heterogenous catalytic reaction A(g) + B(g) → C(g) is given by $$ - {{\text{r}}_{\text{A}}} = \frac{{{\text{k}}.{{\text{K}}_{\text{A}}}.{{\text{p}}_{\text{A}}}.{{\text{P}}_{\text{B}}}}}{{1 + {{\text{K}}_{\text{A}}}.{{\text{P}}_{\text{A}}} + {{\text{K}}_{\text{C}}}.{{\text{p}}_{\text{C}}}}},$$ where K
A
and K
C
are the adsorption equilibrium constants. The rate controlling step for this reaction is
A
Absorption of A
B
Surface reaction between absorbed A and absorbed B
C
Surface reaction between absorbed A and B in the gas phase
D
Surface reaction between A in the gas phase and absorbed B
A word arrangement machine, When given an input line of words, rearranges it in every step following a certain rule. Following is an illustration of an input line of words and various steps of rearrangement.
Input: gone are take enough brought station
Step 1: take gone are enough brought station
Step 2: take are gone enough brought station
Step 3: take are station gone enough brought
Step 4: take are station brought gone enough
And Step 4 is the last step for this input. Now, find out an appropriate step in the following question following the above rule. Question:
Input: car on star quick demand fat
What will be the third step for this input ?
A
star car demand quick on fat
B
star quick car demand on fat
C
star car quick demand on fat
D
none of these
A word arranging device rearranges words step-by-step in a particular order according to set of rules. The device stops when the final result is obtained.
Input: but going for crept te light sir
Step 1: crept but going for te light sir
Step 2: crept going light but for te sir
Step 3: crept going light but for sir te
And Step 3 is the last step for this input. Now, find out an appropriate step in the following question following the above rules. Question:
Input: more fight cats cough sough acts idea
What will be the last step for this input ?
A
cough fight sough acts cats idea more
B
cough fight sough acts cats more idea
C
cough more fight sough acts idea cats
D
none of these
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>
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
A
Proportional to
B
Independent of
C
Inversely proportional to
D
Proportional to the square of
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
Letx(t) be the input and y(t) be the output of a continuous time system. Match the system properties P
1
, P
2
and P
3
with system relations R
1
, R
2
, P
3
, P
4
.
Properties
P
1
: Linear but NOT time-invariant
P
2
: Time-invariant but NOT linear
P
3
: Linear and time-invariant
Relations
R
1
: y(t) = t
2
x(t)
R
2
: y(t) = t |x(t)|
R
3
: y(t) = |x(t)|
R
4
: y(t) = x(t - 5)
A
(P<sub>1</sub>, R<sub>1</sub>), (P<sub>2</sub>, R<sub>3</sub>), (P<sub>3</sub>, R<sub>4</sub>)
B
(P<sub>1</sub>, R<sub>2</sub>), (P<sub>2</sub>, P<sub>3</sub>), (P<sub>3</sub>, R<sub>4</sub>)
C
(P<sub>1</sub>, R<sub>3</sub>), (P<sub>2</sub>, R<sub>1</sub>), (P<sub>3</sub>, R<sub>2</sub>)
D
(P<sub>1</sub>, R<sub>1</sub>), (P<sub>2</sub>, R<sub>2</sub>), (P<sub>3</sub>, R<sub>3</sub>)
A liquid phase reaction occurring in a CSTR follows first order dynamics. The feed rate is 500m3/min. Initial concentration of the feed is 50mol/m3. If the reaction conversion is 50% and the reaction is carried out in a 0.5 m3 CSTR, what is the value of rate constant?
A
40
B
20
C
10
D
5