Chemical Engineering MCQs

Page No. 541

In a semi-batch reactor __________________?


aMixing takes place in axial direction only


bVelocity of reaction can be controlled


cCondition similar to plug flow reactor exists


dResidence time is constant



A catalyst loses its activity due to__________________?


aLoss in surface area of the active component


bAgglomeration of metal particles caused by thermal sintering of the solid surface


cCovering of the catalytic active sites by a foreign substance


dAll A., B. and C.


View Answer All A., B. and C.

Transition state theory relates the above quantities as___________________?


ak ∝ e-E/RT


bk ∝ T.eE/RT


ck ∝ √T


dk ∝ T1.5


View Answer k ∝ T.eE/RT

The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is______________________?


a0


b1


c2


d3


View Answer 2

Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?


a1/4


b1/2


c2


d4


View Answer 1/4

The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is___________________?


a0.5


b1


c2


d3


View Answer 2

For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of ‘P’ is doubled. If the reaction rate is proportional to Cp n, then what is the value of ‘n’ for this chemical reaction ?


a0


b1


c2


d3


View Answer 1

The rate constant of a chemical reaction decreases by decreasing the____________________?


aPressure


bConcentration of reactants


cTemperature


dDuration of reaction


View Answer Temperature

If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to__________________?


a(CA/2)n


b(½)n CA


c(CA/2)1/n


d(CA)1/2n


View Answer (½)n CA

In an exothermic chemical reaction, the reactants compared to the products have__________________?


aHigher temperature


bMore energy


cLess energy


dSame energy


View Answer More energy

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