Questions and answers for exam Preparation

MCQs

Total Questions : 2307 | Page 229 of 231 pages

Question 2281. Velocity of a reaction depends upon the_________________?

Nature of the reactants
Concentration of the reactants
Temperature at which the reaction is carried
All A., B. and C.

Discuss Question

Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2282. From among the following, choose one which is not an exothermic process ?

Methanol synthesis
Catalytic cracking
Ammonia synthesis
Oxidation of sulphur

Discuss Question

Answer: Option B. -> Catalytic cracking
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2283. If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is________________?

Discuss Question

Answer: Option B. -> 2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2284. Pick out the wrong statement ?

Chemical reactions with high activation energy are very temperature sensitive
A flat velocity profile exists in a plug flow reactor
The residence time for all the elements of fluid in case of a P.F.R. need not be same
Half life of a reaction increases with increased initial concentration for reaction orders more than one

Discuss Question

Answer: Option C. -> The residence time for all the elements of fluid in case of a P.F.R. need not be same
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2285. There is no correspondence between stoichiometric and the rate equation in case of a/an _____________ reaction?

Elementary
Multiple
Autocatalytic
Non-elementary

Discuss Question

Answer: Option D. -> Non-elementary
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2286. Specific rate constant for a second order reaction__________________?

Is independent of temperature
Varies with temperature
Depends on the nature of the reactants
Both B. and C.

Discuss Question

Answer: Option D. -> Both B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2287. Pick out the correct statement?

Reactions with high activation energies are very temperature sensitive
Chemical equilibrium is a static state
A photochemical reaction is catalysed by light
A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction

Discuss Question

Answer: Option A. -> Reactions with high activation energies are very temperature sensitive
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2288. Pick out the wrong statement ?

In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time
In a semi-batch reactor, one reactant is charged batch wise, while the other reactant is fed continuously
In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system
In a continuous flow reactor, both the reactants and the products flow out continuously

Discuss Question

Answer: Option C. -> In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in a well agitated system
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2289. Pick out the wrong statement?

The integral method of analysing kinetic data is used when the data is scattered
The differential method of analysing kinetic data requires more accurate or larger amounts of data
When the reaction rate is independent of temperature, the reaction is said to be of zero order
The ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and f

Discuss Question

Answer: Option C. -> When the reaction rate is independent of temperature, the reaction is said to be of zero order
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2290. Pick out the correct statement?

A lower temperature favours the reaction of lower activation energy
The dispersion number for a reactor/vessel is uL/D
The rate controlling step in a reaction involving many steps is the fastest step
Pore volume and porosity of a catalyst is measured by Brunauer-Emmett-Teller (BET) technique

Discuss Question

Answer: Option A. -> A lower temperature favours the reaction of lower activation energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!