Explore topic-wise MCQs in Chemical Reaction Engineering.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Reaction Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

The time required to convert to a fraction of 0.7 for a first order reaction is ____

A. t<sub>0.7</sub> = ( frac{(0.7)}{C_{A0} k} )
B. t<sub>0.7</sub> = ( frac{(-0.7)}{C_{A0} k} )
C. t<sub>0.7</sub> = ( frac{(0.3)}{C_{A0} k} )
D. t<sub>0.7</sub> = ( frac{(-0.3)}{C_{A0} k} )
Answer» E.
Discussion
2.

The fractional conversion is expressed as____

A. ( frac{C_A}{C_{A0}} )
B. ( frac{C_{A0}}{C_A} )
C. ( frac{1}{C_{A0}} )
D. ( frac{C_A}{kC_{A0}} )
Answer» B. ( frac{C_{A0}}{C_A} )
Discussion
3.

If t0.5 = 100 minutes and initial concentration is 10, then the order of the reaction is ____

A. 4
B. -1
C. -2
D. 1
Answer» C. -2
Discussion
4.

What is the slope of the plot of ln (t0.5) and ln (CAo)? (Where n is the reaction order)

A. 1-n
B. 2-n
C. n
D. ( frac{n}{2} )
Answer» B. 2-n
Discussion
5.

For a zero order reaction, the slope of t0.5 and CAo is ____

A. 2
B. 3
C. 1
D. 0
Answer» D. 0
Discussion
6.

The relationship between t.0.5 and CAo for a zero order reaction is ____

A. t<sub>0.5</sub> = ( frac{1}{kC_{A0}} )
B. t<sub>0.5</sub> = ( frac{1}{C_{A0}} )
C. t<sub>0.5</sub> = ( frac{C_{A0}}{k} )
D. t<sub>0.5</sub> = ( frac{C_{A0}}{2k} )
Answer» E.
Discussion
7.

The plot representing the relationship between ln(t0.5) and ln(CAo) for second order reaction is ___

A. <img alt="Plot of relationship between ln(t0.5) &amp; ln(CAo) for second order reaction - option a" class="alignnone size-full wp-image-284008" height="338" sizes="(max-width: 391px) 100vw, 391px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4a.png 391w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4a-300x259.png 300w" width="391"/>
B. <img alt="Plot of relationship between ln(t0.5) &amp; ln(CAo) for second order reaction - option b" class="alignnone size-full wp-image-284007" height="334" sizes="(max-width: 347px) 100vw, 347px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4b.png 347w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4b-300x289.png 300w" width="347"/>
C. <img alt="Plot of relationship between ln(t0.5) &amp; ln(CAo) for second order reaction - option c" class="alignnone size-full wp-image-284006" height="341" sizes="(max-width: 360px) 100vw, 360px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4c.png 360w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4c-300x284.png 300w" width="360"/>
D. <img alt="Plot of relationship between ln(t0.5) &amp; ln(CAo) for second order reaction - option d" class="alignnone size-full wp-image-284005" height="329" sizes="(max-width: 361px) 100vw, 361px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4d.png 361w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4d-300x273.png 300w" width="361"/>
Answer» D. <img alt="Plot of relationship between ln(t0.5) &amp; ln(CAo) for second order reaction - option d" class="alignnone size-full wp-image-284005" height="329" sizes="(max-width: 361px) 100vw, 361px" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4d.png 361w, https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-aptitude-test-q4d-300x273.png 300w" width="361"/>
Discussion
8.

For all orders of reaction except the first order, half life is related to initial concentration as ____

A. t<sub>0.5</sub> C<sub>Ao</sub><sup>n</sup>
B. t<sub>0.5</sub> C<sub>Ao</sub><sup>1-n</sup>
C. t<sub>0.5</sub> C<sub>Ao</sub><sup>2n</sup>
D. t<sub>0.5</sub> C<sub>Ao</sub>
Answer» C. t<sub>0.5</sub> C<sub>Ao</sub><sup>2n</sup>
Discussion
9.

In terms of conversion, half life is the time taken for ____

A. 50% conversion
B. 75% conversion
C. 20% conversion
D. 30% conversion
Answer» B. 75% conversion
Discussion
10.

State true or false.
For a second order reaction, t.0.5 is directly proportional to the initial concentration.

A. True
B. False
Answer» C.
Discussion