Chemical Engineering MCQs

Page No. 581

A catalyst in a chemical reaction____________________?


aDecreases the activation energy

✖


bAlters the reaction mechanism

✖


cIncreases the frequency of collisions of reacting species

✖


dAll A., B. and C.

✓


View Answer All A., B. and C.

The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ?


aCA = 1.2 CA0 (1 – X)/(1 – 0.33X)

✖


bCA = 1.2 CA0 (1 – X)/(1 – 0.5X)

✖


cCA = 0.83 CA0 (1 – X)/(1 – 0.33X)

✓


dCA = 0.83 CA0 (1 – X)/(1 – 0.5X)

✖



Mean residence time is equal to the space time, when_________________?


aThe feed rate is measured at temperature and pressure in the reactor

✖


bThe temperature, pressure and the density of reaction mixture remains constant throughout the reactor

✖


cThere is no change in number of moles in gaseous reaction

✖


dAll A., B. and C.

✓


View Answer All A., B. and C.

In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)_____________________?


aCA

✖


bCA2

✓


cCA3

✖


dCA4

✖


View Answer CA2

Knudsen diffusion is directly proportional to _____________________?


aT

✖


b√T

✓


c1/√T

✖


dT2

✖


View Answer √T

Exposure of a photographic plate to produce a latent image is an example of _______________ reaction?


aVery slow

✖


bVery fast

✖


cPhotochemical

✖


dBoth B. and C.

✓


View Answer Both B. and C.

In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in _______________ in the concentration of CO2?


aNo change

✓


bIncrease

✖


cDecrease

✖


dUnpredictable from the data

✖


View Answer No change

The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CA n, then what is the value of n for this reaction ?


a0

✖


b0.5

✖


c1

✓


d2

✖


View Answer 1

Arrhenius equation shows the variation of ___________________ with temperature?


aReaction rate

✖


bRate constant

✓


cEnergy of activation

✖


dFrequency factor

✖


View Answer Rate constant

The rate constant of a chemical reaction increases by increasing the______________________?


aTemperature

✓


bPressure

✖


cReactant’s concentration

✖


dNone of these

✖


View Answer Temperature

Goto Page No.

Page 581 of 843

Alphabetical MCQs Categories
—

Here below You find all kind of categories of MCQs in alphabetical order.


"Comprehensive Collection of MCQs: Alphabetically Organized by Subject"
—

"Discover an extensive collection of multiple-choice questions (MCQs) neatly categorized by subject from A to Z. This resource is designed for anyone eager to explore various topics in a straightforward and organized manner. Whether you're a student preparing for exams, an educator seeking supplementary materials, or simply curious about different subjects, this compilation offers a convenient way to learn and assess your knowledge. With questions arranged alphabetically, navigation is effortless, allowing you to delve into subjects of interest at your own pace. Engage, learn, and expand your understanding with this accessible and comprehensive repository of MCQs!"


BolPakistan

bolpakistan.com.pk includes Job Mcqs and Pak Mcqs is the Top Largest Mcqs Forum in World, in which you can read Mcqs of All Subjects, PPSC test preparation, FPSC, NTS and PPSC PAST PAPERS, PPSC PAST MCQS. A Collection of Repeated MCQs for JOBs seekers.

Copyright © 2024, Designed & Developed by BolPakistan