Chemical Reaction Quiz 1
1 / 50
A catalyst________?
2 / 50
A high space velocity means that a given___________?
3 / 50
A first order homogeneous reaction of the type X ? Y ? Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time ?
4 / 50
A pulse tracer is introduced in an ideal CSTR (with a mean residence time I) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be___________?
5 / 50
A first order reaction requires two equal sized CSTR. The conversion is______?
6 / 50
A catalyst inhibitor______?
7 / 50
A batch reactor suffers from following disadvantage ?
8 / 50
A catalyst in a chemical reaction ________ free energy change in the reaction?
9 / 50
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_______?
10 / 50
A multiple reaction may be classified as a _________ reaction?
11 / 50
A reactor is generally termed as an autoclave, when it is a_______?
12 / 50
A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?
13 / 50
?If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process?. The diffusivity under this condition is called ?Knudsen diffusivity?, which is affected by the_______?
14 / 50
?Unreacted core model? represents the reaction involving ________?
15 / 50
?n? number of plug flow reactors (P.F.R) in series with a total volume ?V? gives the same conversion as one P.F.R. of volume_________?
16 / 50
A gaseous reactant is introduced in a mixed reactor of 3 litres volume at the rate of 1 litre/second. The space time is _______ seconds?
17 / 50
A catalyst in a chemical reaction______?
18 / 50
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_________?
19 / 50
A catalyst promoter__________?
20 / 50
A batch reactor is characterised by ______?
21 / 50
A back mix reactor is_____?
22 / 50
?N? plug flow reactors in series with a total volume ?V? gives the same conversion as a single plug flow reactor of volume ?V? for ________ order reactions?
23 / 50
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to __________?
24 / 50
6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?
25 / 50
_______ explains the mechanism of catalysis?
26 / 50
_______ is the response curve for a step input signal from a reactor ?
27 / 50
_________ resistance is not involved in the combustion of a carbon particle?
28 / 50
A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ______ minutes?
29 / 50
A chemical reaction, A ? 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is _____?
30 / 50
A catalyst is said to be a negative catalyst, if it _____?
31 / 50
A balanced chemical reaction equation conforms to the law of_________?
32 / 50
A catalyst loses its activity due to___________?
33 / 50
A photochemical reaction is ________?
34 / 50
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant) ?
35 / 50
A batch reactor is________?
36 / 50
A reaction in which one of the products of reaction acts as a catalyst is called a/an _______ reaction?
37 / 50
A Catalyst ______?
38 / 50
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
39 / 50
A batch reactor is suitable for___________?
40 / 50
A first order irreversible reaction, A ? B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that ______ in the two reactors?
41 / 50
A first order reaction A ? B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by___________?
42 / 50
A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired ?
43 / 50
A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of________?
44 / 50
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by_________?
45 / 50
_______ catalytic reaction is involved in the thermal cracking of gas oil ?
46 / 50
A backmix reactor__________?
47 / 50
A chemical reaction occurs, when the energy of the reacting molecules is _________ the activation energy of reaction?
48 / 50
A plug-flow reactor is characterized by _______?
49 / 50
A photochemical reaction is ________ light?
50 / 50
A non-catalytic chemical reaction of the type as shown in the bellow figure is called a ______ reaction?
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