Chemical Engineering MCQs

Page No. 549

Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3 ⇌ CaO + CO2), the pressure of CO2 increases, if____________________?


aA catalyst is added


bThe temperature is increased


cAn inert gas is pumped keeping the temperature constant


dNone of these



Thermodynamic equilibrium constant in a system is affected by___________________?


aInerts


bPressure


cTemperature


dAll A., B. & C.


View Answer Temperature

Sum of the powers of the concentration terms in the rate equation is called the _____________ of the reaction?


aOrder


bOverall order


cMolecularity


dNone of these


View Answer Overall order

The rate at which a chemical substance reacts is proportional to its _____________________?


aActive mass


bMolecular weight


cEquivalent weight


dAtomic weight


View Answer Active mass

Which of the following is the most suitable for isothermal operation?


aBatch reactor


bBack-mix reactor


cPlug-flow reactor


dFixed bed reactor


View Answer Back-mix reactor

An exothermic reaction takes place in an adiabatic reactor. The product temperature ______________ reactor feed temperature?


aIs always equal to


bIs always greater than


cIs always less than


dMay be greater or less than



The rate of forward reaction, at chemical equilibrium is ______________ the rate of backward reaction?


aMore than


bLess than


cEqual to


dEither B. or C.


View Answer Equal to

For a first order chemical reaction, the rate constant_________________?


aChanges on changing the concentration units


bIs not a function of the unit of time


cHas unit of time-1


dNone of these


View Answer Has unit of time-1

When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only _______________ the true value?


aTwice


bHalf


cEqual


dNone of these


View Answer Half

Reverse reaction in a chemical equilibrium is favoured by the________________?


aRemoval of one of the products regularly


bIncrease in the concentration of one of the products


cIncrease in the concentration of one of the reactants


dNone of these



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